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Journal of Materials Science & Technology 2022年第17期112卷 184-194页

作者： Jiangtao Yu Shucai Zhang Huabing Li Zhouhua Jiang Hao Feng Panpan Xu Peide Han School of Metallurgy Northeastern UniversityShenyang 110819China Key Laboratory for Ecological Metallurgy of Multimetallic Ores(Ministry of Education) Shenyang 110819China College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China

Influence mechanism of B segregation on the microstructure evolution and hot ductility of S32654 at850-1250℃was systematically investigated through experimental research and theoretical calculation.The results demonstrated that the segregation of B at grain boundary(GB)played different roles in the microstructure evolution and hot ductility at various temperatures.At 850℃,B segregation inhibited Mo segregation at the GB and enhanced the GB cohesion.At 900-950℃,B segregation restricted the diffusion and segregation of Mo to the GB,inhibiting the precipitation ofσphase.At 1000-1050℃,B segregation accelerated the dislocation accumulation and limited the GB migration,promoting the nucleation and inhibiting the growth of DRX grains.At 1100-1150℃,B has little effect on the DRX due to sufficient energy supply by higher temperature.Under the above beneficial effects of B,the hot ductility of S32654 was improved to varying degrees at 850-1150℃.However,as the temperature increased to1200-1250℃,B segregation decreased the solidus temperature and enhanced the liquefaction cracking tendency,resulting in a deterioration of the hot ductility.

关键词： Super austenitic stainless steel Boron hot ductility Grain boundary segregation Atom probe tomography

Detrimental effect of arsenic on hot ductility of copper-bearing steel

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Journal of Iron and Steel Research(International) 2023年第10期30卷 2043-2054页

作者： Wen-bin Xin Yu-yu Liang Jing Zhang Qing-yang Meng Jun Peng Yong-chun Deng Yin-ju Jiang School of Materials and Metallurgy Inner Mongolia University of Science and TechnologyBaotou 014010Inner MongoliaChina Collaborative Innovation Center of Integrated Exploitation of Bayan Obo Multi-Metal Resources Inner Mongolia University of Science and TechnologyBaotou 014010Inner MongoliaChina

The effect of As content on the hot ductility of steel with 0.17 wt.%Cu was investigated at 700-1100℃using a Gleeble-3800 thermal-mechanical simulator.The results showed that increasing the As content from 0 to 0.15 wt.%obviously widened the hot ductility trough and pushed the trough into the high-temperature regime.Meanwhile,when the As content exceeded 0.10 wt.%,significant hot ductility deterioration was found.In the ferrite+austenite two-phase regions of 700-800℃,the fracture appearance changed from dimple ductile to intergranular ductile or from intergranular ductile to intergranular decohesion with increasing As content.The inhibition formation of proeutectoid ferrite and austenite grain coarsening were responsible for the slight hot ductility deterioration by As in the two-phase region.In the austenite single-phase region above 850℃,the fracture appearance changed from dimple ductile to intergranular decohesion with increasing As content,especially at 850-950℃.Suppression of dynamic recrystallization and grain boundary segregation of As resulted in serious damage of the hot ductility and widened the ductility trough in the single-phase region.

关键词： Arsenic Copper hot ductility Proeutectoid ferrite Grain boundary segregation

hot ductility behavior of a Fe-0.3C-9Mn-2Al medium Mn steel

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International Journal of Minerals,Metallurgy and Materials 2021年第3期28卷 422-429页

作者： Yong-jin Wang Shuai Zhao Ren-bo Song Bin Hu School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China

The hot ductility of a Fe-0.3C-9Mn-2Al medium Mn steel was investigated using a Gleeble3800 thermo-mechanical simulator.hot tensile tests were conducted at different temperatures(600-1300℃)under a constant strain rate of 4×10^(−3)s^(−1).The fracture behavior and mechanism of hot ductility evolution were discussed.Results showed that the hot ductility decreased as the temperature was decreased from 1000℃.The reduction of area(RA)decreased rapidly in the specimens tested below 700℃,whereas that in the specimen tested at 650℃was lower than 65%.Mixed brittle-ductile fracture feature is reflected by the coexistence of cleavage step,intergranular facet,and dimple at the surface.The fracture belonged to ductile failure in the specimens tested between 720-1000℃.Large and deep dimples could delay crack propagation.The change in average width of the dimples was in positive proportion with the change in RA.The wide austenite-ferrite intercritical temperature range was crucial for the hot ductility of medium Mn steel.The formation of ferrite film on austenite grain boundaries led to strain concentration.Yield point elongation occurred at the austenite-ferrite intercritical temperature range during the hot tensile test.

关键词： medium Mn steel hot ductility reduction of area fracture behavior microstructure characterization

hot ductility of Vanadium Micro-alloying Steel Continuous Casting Slabs

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Journal of University of Science and Technology Beijing 2002年第1期9卷 9-12页

作者： XinhuaWang DexinDu 等 MetallurgySchool UniversityofScienceandTechnologyBeihjingBeijing100083China PanzhihuaIronandSteelResearchInstitute Panzhihua617000China

The hot ductility of the V-containing micro-alloying steel CC (continuouscasting) slabs and precipitation of vanadium carbide in the tensile specimens were investigated. Theresults indicate that the precipitation ratio and precipitation rate of vanadium in the specimensreach maximum respectively at 900, -825 and 825 deg C. There is still l0 percent-l7 percent ofvanadium precipitated when the deformation temperature decreases to 800-700 deg C. Vanadium largelyaffects the ductility of the steel in the low ductility temperature Region III. Embrittlement ofsteel with higher V content is severer in the region and the embrittlement extends to lowertemperature.

关键词： V micro-alloying steel CC slab hot ductility carbide nitride precipitation

hot ductility of Ti-V Bearing Microalloyed Steel in Continuous Casting

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Journal of Iron and Steel Research(International) 2014年第4期21卷 451-458页

作者： Yan-hui SUN Ya-nan ZENG Kai-ke CAI Metallurgical and Ecological Engineering School University of Science and Technology Beijing

hot ductility of Ti-V bearing steel was studied by theoretical calculation and thermal simulation experi ment. Meanwhile, microsegregation and precipitates were analyzed. The results showed that elements S, Ti and O were enriched at the grain boundaries, while the hot ductility was deteriorated by inclusions of （Fe, Mn, Si, Al）（S, O） in the interdendritic region. At tbe temperature of 1 100℃, large TiN particles had little effect on hot ductility. In the temperature range from 975 to 925 ℃, reduction of area （R. A） declined rapidly from 81. 88% to 63.16% with the size of particles decreasing from 40 to 20 nm and quantity increasing from 1.4 to 11.9 μm 2, respectively. In the temperature range from 875 to 825℃, R. A reduced unobviously from 35.14% to 28.6% with ferric films thickening gradually. The critical stress, 88.79 MPa, was equal to tensile strength at 825℃. Intergranular fracture was easy to occur with higher critical stress below 825℃.

关键词： hot ductility microalloyed steel solute segregation precipitate critical stress

hot ductility OF 304HC STAINLESS STEEL AND THE MODEL OF RESISTANCE TO DEFORMATION

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Acta Metallurgica Sinica(English Letters) 2003年第2期16卷 97-103页

作者： H.S.Di G.Z.Cui G.D.Wang X.H.Liu State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110004ChinaState Key Laboratory of Rolling and AutomationNortheastern UniversityShenyang 110004ChinaState Key Laboratory of Rolling and AutomationNortheastern UniversityShenyang 110004ChinaState Key Laboratory of Rolling and AutomationNortheastern UniversityShenyang 110004China

The ductility map of 304HC stainless was determined by using the Gleeble-1500 dynamic thermal-mechanical simulator. The effect of Cu on the hot ductility of 304HC stainless steel was analyzed and the mathematical model of resistance to deformation was established. The microstructure, inclusion and fracture surface were studied by using the method of micro structure analysis, scanning, energy spectrum and electron microscope. The results show that Cu has effect on the hot ductility, and the hot ductility of 304HC stainless steel decrease with the increase of content of Cu. The deformation temperature also has much effect on the hot ductility, the suitable deformation temperature are 1100-1200℃. The reason of it is that the Cu rich chemical compounds were precipitated from austenite phase during cooling. The Cu rich chemical compounds are brittle substance such as Cu2S, Cu2O and ε-Cu etc.

关键词： 304HC stainless steel hot ductility brittle compounds precipi- tation mathematical model resistance to deformation

hot ductility of DSS and Its Microstructure Observation During hot Deformation

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Journal of Iron and Steel Research(International) 2013年第8期20卷 83-86页

作者： SONG Zhi-gang ZHENG Wen-jie FENG Han WU Zhong-zhong GUO Hai-sheng YU Fei Central Iron and Steel Research Institute

By selecting several typical duplex stainless steels （DSS）, i. e. , 00Cr22NiSMo3N, 00Cr21Ni2MnSN and 00Cr25NiTMo4N, as research materials, hot ductility characteristic of DSS was studied by thermal simulation meth-od and microstructure evolution during hot compression was observed through TEM. The results show that the opti-mum hot ductility temperature range of DSS is 1050-1200 ℃. 00Cr25NiTMo4N exhibits the worst hot ductility and 00Cr21Ni2MnSN has similar hot ductility to 00Cr22Ni5Mo3N. During hot compression, the dynamic recovery of austenite occurs in DSS while the dynamic recovery and recrystallization of ferrite take place in 00Cr22NiSMo3N and 00Cr21Ni2MnSN, but only the dynamic recovery of ferrite can be observed in 00Cr25Ni7Mo4N.

关键词： DSS hot ductility hot deformation microstructure observation

Microstructure and hot ductility behavior of Ni-based superalloy U720Li with boron addition

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Rare Metals 2021年第5期40卷 1145-1154页

作者： Guang-Di Zhao Fang Liu Xi-Min Zang Wen-Ru Sun School of Material and Metallurgy University of Science and Technology LiaoningAnshan 114051China Institute of Metal Research Chinese Academy of SciencesShenyang 110016China

High-alloyed superalloy U720 Li is difficult to be processed through the conventional cast and wrought route.Boron is an important strengthening element for superalloys,but the role of boron in the hot ductility of U720 Li alloy is not clear.This study is focused on the effect of boron addition,in the range ofhot ductility behavior of superalloy U720 Li.It is found that boron addition significantly increases the content of eutectic(γ+γ’)and greatly affects the degree of continuity of the grain boundary eutectic(γ+γ’)precipitation.Boron addition dramatically worsens the 1100℃ tensile ductility of conventional cast U720 Li alloy and causes a change in tensile fracture mode from transgranular to intergranular.The eutectic(γ+γ’)represents the most effective site for crack initiation.Boron deteriorates the hot ductility mainly by promoting the continuous precipitation of eutectic(γ+γ’)along the grain boundary.

关键词： Boron U720Li Eutectic(γ+γ’) hot ductility Fracture mechanism

Effects of chromium on the microstructure and hot ductility of Nb-microalloyed steel

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International Journal of Minerals,Metallurgy and Materials 2021年第6期28卷 1011-1021页

作者： Yang Liu Yan-hui Sun Hao-tian Wu Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing 100083China

It is well-known that the surface quality of the niobium microalloy profiled billet directly affects the comprehensive mechanical properties of the H-beam.The effects of chromium on theγ/αphase transformation and high-temperature mechanical properties of Nb-microalloyed steel were studied by Gleeble tensile and high-temperature in-situ observation experiments.Results indicated that the starting temperature of the γ→αphase transformation decreases with increasing Cr content.The hot ductility of Nb-microalloyed steel is improved by adding 0.12wt% Cr.Chromium atoms inhibit the diffusion of carbon atoms,which reduces the thickness of grain boundary ferrite.The number fractions of high-angle grain boundaries increase with increasing chromium content.In particular,the proportion is up to 48.7% when the Cr content is 0.12wt%.The high-angle grain boundaries hinder the crack propagation and improve the ductility of Nb-microalloyed steel.

关键词： phase transformation hot ductility chromium high-angle grain boundaries grain boundary ferrite

Effects of Ti-Ce refiners on solidification structure and hot ductility of Fe-36Ni invar alloy

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Journal of Rare Earths 2013年第9期31卷 927-932页

作者：于彦冲陈伟庆郑宏光 State Key Laboratory of Advanced Metallurgy School of Metallurgical and Ecological EngineeringUniversity of Science and Technology Beijing Metallurgical Process Department Baosteel Research Institute

Effects of Ti-Ce refiners on the solidification structure and the hot ductility of Fe-36Ni invar alloy were investigated, the corresponding mechanisms were also discussed. The results showed that the solidification of the alloy was remarkably refined with the addition of 0.05%Ti-0.01%Ce refiners. Not only did the columnar grains become shorter and thinner, but the growth pattern of them changed into staggered growth from linear growth. The alloy had a bad hot ductility below 1050 °C, which was mainly attrib-uted to weaker boundaries and the presence of grain boundary sliding. However, the hot ductility of the alloy was highly enhanced at 850-1000 °C as the addition of 0.05%Ti-0.01%Ce refiners could refine grain sizes, thus hinder grain boundary sliding, strengthen the grain boundary and promote the grain boundary movement. The alloy had a good hot ductility over 1050 °C, dynamic recrys-tallization occurred and was found to be responsible for the better hot ductility. In addition, the average coefficient of thermal ex-pansion of the alloy decreased a little with the addition of 0.05%Ti-0.01%Ce refiners, which met the requirement of material prop-erties.

关键词： Fe-36Ni invar alloy Ti-Ce refmer solidification hot ductility coefficient of thermal expansion rare earths