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Static recrystallization behaviors and mechanisms of 7Mo super-austenitic stainless steel with undissolved sigma precipitates during double-stage hot deformation

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Journal of Iron and Steel Research International 2024年第2期31卷 475-487页

作者： Shi-guang Xu Jin-shan He Run-ze Zhang Fu-cheng Zhang xi-tao wang Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing100083China State Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao066004HebeiChina Shandong Provincial Key Laboratory for High Strength Lightweight Metallic Materials Advanced Materials InstituteQilu University of Technology(Shandong Academy of Science)Jinan250353ShandongChina

Static recrystallization(SRX)behaviors and corresponding recrystallization mechanisms of 7Mo super-austenitic stainless steel were studied under different deformation *** order of influence of deformation parameters on static recrystallization behaviors,from high to low,is followed by temperature,first-stage strain and strain ***,the effect of holding time on static recrystallization behaviors is significantly controlled by *** addition,with the increase in temperature from 1000 to 1200°C,the static recrystallization mechanism evolves from discontinuous static recrystallization and continuous static recrystallization(cSRX)to metadynamic recrystallization and cSRX,and finally to *** cSRX exists at all *** is because high stacking fault energy(56 mJ m−2)promotes the movement of dislocations,making the deformation mechanism of this steel is dominated by planar slip of *** undissolved sigma precipitates promote static recrystallization through particle-stimulated ***,small strain-induced precipitates at grain boundaries hinder the nucleation of conventional SRX and the growth of recrystallized grains,while the hindering effect decreases with the increase in temperature.

关键词： 7Mo super-austenitic stainless steel Double-stage hot deformation Conventional static recrystallization Metadynamic recrystallization Strain-induced precipitation

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Effect of cooling rate on microstructure, hardness, and residual stress of 0.28C-0.22Ti wear-resistant steel

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Journal of Iron and Steel Research International 2019年第8期26卷 866-874页

作者： Chen Dong Hui-bin Wu xi-tao wang Collaborative Innovation Center of Steel Technology University of Science and Technology Beijing Beijing 100083 China

The microstructure, hardness, and residual stress of 0.28C-0.22Ti wear-resistant steel produced with cooling rates varying from 80.0 to 0.3℃/s were determined using a dilatometer, scanning electron microscope, Vickers hardness tester, and nanoindentation tester. The results showed that the hardness of martensite decreased at a rate of approximately 0.935 HV/s with carbon diffusion time (the cooldown time required to transition from Ar3, 635-100℃). The range of the residual stress caused by the hard particles decreased with decreasing cooling rate, from - 400-300 MPa (cooling rate 40℃/s) to - 200-100 MPa (cooling rate 0.5℃/s), proving that the TiC particles significantly contributed to the residual stress in the high-titanium steels.

关键词： Cooling rate Microstructure Hardness TiC particle Residual stress

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A Physically Based Dynamic Recrystallization Model Considering Orientation Effects for a Nitrogen Alloyed Ultralow Carbon Stainless Steel during Hot Forging

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Journal of Iron and Steel Research International 2016年第4期23卷 364-371页

作者： Gan-lin xiE An HE Hai-long ZHANG Gen-qi wang xi-tao wang State Key Laboratory for Adwmced Metals and Materials Universily of Science and Technology BeijingBeijing 100083China Yantai Taihai Manoir Nuclear Power Equipment Corporation Yantai 264003ShandongChina Collaborative Innovation Center of Steel Technology Universily of Science and Technology BeijingBeijing 100083China

The nitrogen alloyed ultralow carbon stainless steel is a good candidate material for primary loop pipes of AP1000 nuclear power plant. These pipes arc manufactured by hot forging, during which dynamic recrystallization acts as the most important microstructural evolution mechanism. A physically based model was proposed to describe and predict the microstructural evolution in the hot forging process of those pipes. In this model, the coupled effects of dislocation density change, dynamic recovery, dynamic recrystallization and grain orientation function were con sidered. Besides, physically based simulation experiments were conducted on a Gleeble 3500 thermo-mcchanical sire ulator, and the specimens after deformation were observed by optical metallography （OM） and clectron back scat toted diffraction （EBSD） method. The results confirm that dynamic recrystallization is easy to occur with increasing deformation temperature or strain rate. The grains become much finer after full dynamic recrystallization. The model shows a good agreement with experimental results obtained by OM and EBSD in terms of stress strain curves, grain size, and recrystallization kinetics. Besides, this model obtains an acceptable accuracy and a wide applying scope for engineering calculation.

关键词： stainless sled dynamic recrystallization hot forging EBSD orientation effect

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Effect of milling duration on hydrogen storage thermodynamics and kinetics of ball-milled Ce-Mg-Ni-based alloy powders

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Journal of Iron and Steel Research International 2018年第7期25卷 746-754页

作者： Dian-chen Feng Hao Sun xi-tao wang Yang-huan Zhang School of Materials and Metallurgy Inner Mongolia University of Science and Technology Baotou 014010 Inner Mongolia China State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing 100083 China Department of Functional Material Research Central Iron and Steel Research Institute Beijing 100081 China

To improve the hydrogen storage performance of CeMg12-type alloys, partially substituting Mg with Ni in the alloy was conducted. The way to synthesize the target alloy powders was the mechanical milling method, by which the CeMg11-Ni ＋ x wt% Ni （x = 100, 200） alloy powders with nanocrystalline and amorphous structure were obtained. The influence of the milling time and Ni content on the hydrogen storage properties of the alloys was discussed. The X-ray diffractometer and high-resolution transmission electron microscope were used to investigate the microstructures of the ball-milled alloys. The hydrogenation/dehydrogenation dynamics were studied using a Sievert instrument and a differential scanning calorimeter which was linked with a H2 detector. The hydrogen desorption activation energies of the alloy hydrides were evaluated by Arrhenius and Kissinger equations. From the results point of views, there is a little decline in the thermo- dynamic parameters （enthalpy and entropy changes） with the increase in Ni content. However, the alloys desorption and absorption dynamics are improved distinctly. What is more, the variation of milling time results in a dramatic influence on the hydrogen storage performances of alloys. Various maximum values of the hydrogen capacities correspond to different milling time, which are 5.805 and 6.016 wt% for the CeMgllNi ＋ x wt% Ni （x = 100, 200） alloys, respectively. The kinetics tests suggest that the hydrogen absorption rates increase firstly and then decrease with prolonging the milling time. The improvement of the gaseous hydrogen storage kinetics results from the decrease in the activation energy caused by the increase in Ni content and milling time.

关键词： CeMg12 alloy Mechanical milling Amorphous - Activation energy Hydrogen storage kinetics Thermodynamics

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Characterization of Impact Deformation Behavior of a Thermally Aged Duplex Stainless Steel by EBSD

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Acta Metallurgica Sinica(English Letters) 2018年第8期31卷 798-806页

作者： Gang Liu Shi-Lei Li Hai-Long Zhang xi-tao wang Yan-Li wang State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Collaborative Innovation Center of Steel Technology University of Science and Technology Beijing

The effect of thermal aging on phase transformation and impact toughness of an as-cast duplex stainless steel was investigated at room temperature. After long-term thermal aging, the impact toughness decreases significantly and the cracks initiate and propagate more easily. The plastic deformation ability of the ferrite phase decreases after thermal aging,which leads to the degradation of impact toughness. High stress concentration occurs on the grain boundaries of the austenite phase in the aged materials. Meanwhile, high-stress concentration areas are also observed in the austenite phase near the grain boundaries. After long-term thermal aging, pinned dislocations in ferrite and along phase boundaries lead to the high stress concentration. Micro-cracks preferentially initiate in the ferrite phase and propagate via separation of phase boundaries. The blocking influences of spinodal decomposition precipitates and G-phase precipitates are stronger than the effect of grain boundaries and phase boundaries on the dislocation movement.

关键词： Duplex stainless steel Thermal aging Charpy impact toughness EBSD

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Improved wear resistance of biodegradable Mg-1.5Zn-0.6Zr alloy by Sc addition

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Rare Metals 2021年第8期40卷 2206-2212页

作者： tao Li xi-tao wang Shou-Qiu Tang Yuan-Sheng Yang Jian-Hua Wu Ji-Xue Zhou Shandong Provincial Key Laboratory of High Strength Lightweight Metallic Materials Advanced Materials InstituteQilu University of Technology(Shandong Academy of Sciences)Jinan250014China Institute of Metal Research Chinese Academy of SciencesShenyang110016China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing100083China Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing100083China

Magnesium alloys exhibit significant potential for use in next-generation biodegradable *** magnesium alloys are expected to exhibit good wear *** this work,the effects of rare earth metal Sc on the wear resistance of biodegradable magnesium alloys were *** average grain sizes of Mg-1.5 Zn-0.6 Zr-x Sc(ZK21-x Sc,x=0,0.2,0.5,1.0;wt%)alloys decreased with Sc content *** other rare earth metals,the grain refinement mechanism of Sc belongs to the heterogeneous nucleation *** yield tensile strengths and Vickers hardness of the ZK21-x Sc alloys markedly improved with the addition of Sc *** could be due to the grain refinement and enhanced bond energy resulting from Sc ***,the friction and wear tests showed that the friction coefficient of the alloys decreased and the weight loss reduced with Sc addition *** implies that Sc addition could enhance the wear resistance of magnesium *** the addition of Sc increasing,the peeling phenomenon weakened gradually and the worn surfaces of samples became *** major wear mechanisms of the as-cast ZK21-x Sc alloys were abrasion wear and delamination wear.

关键词： Magnesium Wear resistance Scandium Hardness Biodegradable

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Effect of thermal aging on the fatigue crack growth behavior of cast duplex stainless steels

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International Journal of Minerals,Metallurgy and Materials 2015年第11期22卷 1163-1170页

作者： Xu-ming Lü Shi-lei Li Hai-long Zhang Yan-li wang xi-tao wang State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Collaborative Innovation Center of Steel Technology University of Science and Technology Beijing

The effect of thermal aging on the fatigue crack growth（FCG） behavior of Z3CN20？09M cast duplex stainless steel with low ferrite content was investigated in this study. The crack surfaces and crack growth paths were analyzed to clarify the FCG mechanisms. The microstructure and micromechanical properties before and after thermal aging were also studied. Spinodal decomposition in the aged ferrite phase led to an increase in the hardness and a decrease in the plastic deformation capacity, whereas the hardness and plastic deformation capacity of the austenite phase were almost unchanged after thermal aging. The aged material exhibited a better FCG resistance than the unaged material in the near-threshold regime because of the increased roughness-induced crack closure associated with the tortuous crack path and rougher fracture surface; however, the tendency was reversed in the Paris regime because of the cleavage fracture in the aged ferrite phases.

关键词： stainless steels fatigue crack growth thermal aging embrittlement fracture morphology

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Microstructure and impact toughness of 16MND5 reactor pressure vessel steel manufactured by electrical additive manufacturing

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Journal of Iron and Steel Research International 2020年第8期27卷 992-1004页

作者： xi-kou He Chang-sheng xie Li-jun xiao Ying Luo Di Lu Zheng-dong Liu xi-tao wang Institute for Special Steels China Iron and Steel Research InstituteBeijing 100081China Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing 100083China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of ChinaChengdu 610041SichuanChina Southern Additive Science and Technology Co. Ltd.Foshan 528225GuangdongChina

Electrical additive manufacturing can improve manufacturing efficiency and reduce the cost of 16MND5 reactor pres-sure vessel steel. Impact tests were conducted to compare the impact toughness of 16MND5 steels manufactured by the electrical additive manufacturing and conventional forging, respectively. It is found that the impact toughness of electrical additive manufacturing specimen was slightly higher than that of conventional forging specimen. The characterizations of microstructure show that there were large ferrites and carbides in electrical additive manufacturing specimen. The fracture mechanisms of electrical additive manufacturing specimen were that microvoids or microcracks were prone to nucleate at the large ferrite/bainite interface and large carbide/bainitic ferrite interface, where the stress concentration was high. In addi-tion, the block size and high-angle grain boundaries played a vital role in hindering crack propagation of electrical additive manufacturing specimen, helping to improve the impact energy and leading to a low ductile–brittle transition temperature. The results suggest that the electrical additive manufacturing technology was an effective method to enhance the impact toughness of 16MND5 steel.

关键词： Electrical additive manufacturing 16MND5 steel Impact toughness Fracture High-angle grain boundary

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Microstructure and properties of 1100 MPa grade low-carbon hot-rolled steel by laser welding

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Journal of Iron and Steel Research International 2018年第2期25卷 228-234页

作者： Chen Dong Ai-min Zhao xi-tao wang Qi-hang Pang Hui-bin Wu Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing 100083 China Engineering Research Institute University of Scienceand Technology Beijing Beijing 100083 China

The microstructure and mechanical properties of the butt joint of 1100 MPa grade hot-rolled low-carbon steel by laser welding were investigated by scanning electron microscopy, micro-hardness and tensile tests. The yield strength and tensile strength of the laser welded joint reached 100.2 and 99.5% of the base material （BM）, respectively. However, the elongation of the welded joint only reached about 60% of BM. The lowest and highest hardness areas both existed in the incomplete recrystallization zone. The width of the softened area of the welded joint is about 240-260 pro. The element distribution has no obvious change for C, Cr, Si, Mn, Ti, etc.

关键词： Hot-rolled steel Laser welding Microstructure Mechanical property Element distribution

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Efects of thermal aging temperature and Cr content on phase separ-ation kinetics in Fe-Cr alloys simulated by the phase feld method

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International Journal of Minerals,Metallurgy and Materials 2013年第11期20卷 1067-1075页

作者： Shu-xiao Li Hai-long Zhang Shi-lei Li Yan-li wang Fei Xue xi-tao wang State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Suzhou Nuclear Power Research Institute

Phase field simulations of phase separation in Fe-Cr binary alloys were performed by using the Cahn-Hilliard diffusion function. A new mobility model in relation to aging temperature and Cr content was used in the simulations. Two alloys of Fe-30at%Cr and Fe-35at%Cr were investigated at two different aging temperatures of 573 and 673 K. The phase separation kinetics was found to consist of three stages： wavelength modulation, amplitude increase, and coarsening of Cr-enriched regions. A higher thermal aging temperature accelerated the phase separation and increased the wavelength of concentration fluctuation. While the effect of Cr content on the phase separation kinetics was slight, Fe-Cr alloys with a higher Cr content were found to generate a larger number and a finer size of Cr-enriched regions. The simulation results provide consultation for design and safe operation of duplex stainless steel pipes in nuclear power plants.

关键词： stainless steel duplex steel phase separation kinetics nuclear power plants

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