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Effect of intercritical deformation on tensile performance of a low-carbon Si-Mn steel processed by quenching and bainitic partitioning

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Journal of Iron and Steel Research International 2020年第2期27卷 208-216页

作者： Ya-qiang Tian Zhong-qian Cao Wang Li Hong-bo Pan Xiao-ping Zheng Jin-ying Song Ying-li Wei Lian-sheng Chen Key Laboratory of the Ministry of Education for Modern Metallurgy Technology North China University of Science and TechnologyTangshan 063210HebeiChina Key Laboratory of Metallurgical Emission Reduction and Resources Recycling of Ministry of Education Anhui University of TechnologyMa'anshan 243002AnhuiChina

The effect of intercritical deformation on retained austenite and tensile performance of a low-carbon Si-Mn steel in modified quenching and bainitic partitioning processes was *** results showed that the intercritical deformation can play a positive role in stabilizing and refining the retained austenite,and possessed promising potential in balancing tensile strength and ductility of multiphase high-strength *** experimental low-carbon Si-Mn steel exhibited multiphase configuration comprising polygonal ferrite,granular bainite and granular structure after two different modified quenching and bainitic partitioning processes,and the bainitic ferrite laths got refined by intercritical *** volume fraction of retained austenite in film-like and blocky morphology was increased from 11.5%to 13.9%due to applied intercritical deformation,and the larger amount of retained austenite provided the sufficient transformation-induced plasticity effect and resulted in enhanced work hardening degree;in response,enhanced ultimate tensile strength 1260 MPa and fracture elongation 22.1%were obtained,leading to increased product of strength and elongation in value of 27.7 GPa% compared to 20.8 GPa% of undeformed structure.

关键词： bainitic steel Intercritical deformation Retained austenite Instantaneous work hardening index Transformation-induced plasticity effect

Hydrogen embrittlement of a microalloyed bainitic forging steel

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Journal of Iron and Steel Research International 2019年第9期26卷 1011-1021页

作者： Wei-jun Hui Zhan-hua Wang Zhi-bao Xu Yong-jian Zhang Xiao-li Zhao Materials Science and Engineering Research Center School of MechanicalElectronic and Control EngineeringBeijing Jiaotong UniversityBeijing 100044China Yantai Branch of China North Industries Group Corporation No. 52 Institute Co. Ltd.Yantai 264003ShandongChina

The hydrogen embrittlement (HE) of a novel microalloyed bainitic forging steel with a strength level of 1100 MPa was evaluated using electrochemical charging and slow strain rate tensile test method with notched round bar specimens. The results show that the susceptibility to HE of the as-forged bainitic forging steel is notably higher than that of the quenched and tempered (Q&T) steel at same strength level, which is ascribed primarily to the presence of a relatively high amount of large blocky martensite/austenite (M/A) constituents of the former. It was found that low-temperature tempering treatment at 200 C could significantly alleviate the susceptibility to HE by a relative decrease of * 35% of the as-forged bainitic forging steel at no expense of strength and ductility, though its resistance to HE is still a little lower than that of the Q&T steel. Thus, it is suggested that efforts concerning refining of the large blocky M/A through optimizing chemical composition and processing route could help to further alleviate the susceptibility to HE of the tested bainitic forging steel.

关键词： Hydrogen embrittlement bainitic forging steel Microstructure Granular bainite M/A constituent

In situ observation of the effect of Al N particles on bainitic transformation in a carbide-free medium carbon steel

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International Journal of Minerals,Metallurgy and Materials 2020年第5期27卷 620-629页

作者： Xiao-jie Zhao Zhi-nan Yang Fu-cheng Zhang State Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao 066004China National Engineering Research Center for Equipment and Technology of Cold Strip Rolling Yanshan UniversityQinhuangdao 066004China

The bainitic transformation of the steels with different mass fractions of N, ~0.002% and 0.021%, was observed in situ by using high-temperature metalloscope. Micrometer-and nanometer-sized aluminum nitride(AlN) particles were found in the steel with 0.021% *** boundaries, the interior of the grains, and Al N particles were used as initial nucleation sites of bainitic ferrite, and bainitic ferrite subunits served as new nucleation sites to induce secondary nucleation. The lengthening rate of bainitic ferrite varied at different nucleation sites, which was controlled by the repeated nucleation and growth of bainitic subunits. The Al N particles not only provided several nucleation sites, but also increased the autocatalytic effect on the transformation, further shortening the incubation period, promoting the bainitic transformation, and refining the bainitic microstructure.

关键词： bainitic steel In situ observation phase transformation aluminum nitride

Microstructural development and wear properties analyses of Fe-based coatings on bainitic steel by laser cladding

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Journal of Iron and Steel Research International 2022年第4期29卷 687-697页

作者： Run-feng Peng Min Zhang Yu-hang Li Yue-long Yu Ying-chun Guan Zhun-li Tan School of Mechanical Electronic and Control EngineeringMaterials Science&Engineering Research CenterBeijing Jiaotong UniversityBeijing 100044China School of Mechanical Engineering and Automation Beihang UniversityBeijing 100191China National Engineering Laboratory of Additive Manufacturing for Large Metallic Components Beihang UniversityBeijing 100083China Hefei Innovation Research Institute of Beihang University Hefei 230013AnhuiChina

Wear-resistant Fe-based coating was prepared by high-speed laser cladding on bainitic *** influence of laser scanning speed on microstructure,microhardness,and wear resistance of cladding coating was *** electron microscopy results showed that the coating was mainly composed of dendrite and *** electron microscope images were converted by binary algorithm to facilitate statistics of dendrite and interdendrite *** results indicate that by accelerating the scanning speed,the interdendrite eutectic structure *** to energydispersive X-ray spectroscopy and X-ray diffraction results,the interdendrite was enriched with elements Cr,Mo,and B,and main structures in the coating wereα-Fe,γ-Fe,and M(23)C_(6).The hardness of the coating was much higher than that of the *** diffused from coating to substrate,resulting in a transition zone of ***,with an increase in the scanning speed,the diffusion of elements at the coating–matrix interface decreased,while the hardness and wear resistance of the coating *** refinement and interdendrite(γ-Fe,M_(23)C_(6))increasing due to high scanning speed were the major contributors to the increase in hardness and wear resistance.

关键词： Laser cladding Microstructure Wear property Fe-based coating bainitic steel

Development of and Perspective on High-Performance Nanostructured bainitic Bearing Steel

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Engineering 2019年第2期5卷 319-328页

作者： Fucheng Zhang Zhinan Yang State Key Laboratory of Metastable Materials Science and Technology Yanshan University Qinhuangdao 066004 China National Engineering Research Center For Equipment and Technology of Cold Strip Rolling Yanshan University Qinhuangdao 066004 China

Bearings are the most important component of nearly all mechanical equipment, as they guarantee the steady running of the equipment, which is especially important for high-end equipment such as highspeed trains and shield tunneling machines. Requirements regarding the quality of bearings are increasing with the rapid development in technology. A country’s bearings manufacturing level directly reflects the level of that country’s steel metallurgy and machinery manufacturing. The performance of the bearing steel is the critical factor that determines the quality of a bearing. The development of new bearing steel with higher performance is the ambition of material researchers and the expectation of the manufacturing industry. Many famous bearing manufacturing enterprises are competing to develop the new generation of bearing steel. Nanostructured bainitic bearing steel (NBBS), which is a newly developed bearing steel, not only possesses high strength and toughness, but also exhibits excellent wear resistance and rolling contact fatigue (RCF) resistance. In recent years, relevant achievements in NBBS in China have led to significant progress in this field. NBBS was first used in China to manufacture large bearings for wind turbines and heavy-duty bearings, with excellent performance. As a result, NBBS and its corresponding heat-treatment process have been included in the national and industry standards for the first time. The bearing industry considers the exploitation of NBBS to be epoch-making, and has termed this kind of bearing as the second generation of bainitic bearing. In this paper, the development of NBBS is reviewed in detail, including its advantages and disadvantages. Further research directions for NBBS are also proposed.

关键词： Nanostructured bainitic bearing steel Bearing steel Nanostructured bainite Development

Effect of Nb on the Microstructure and Properties of Cold Rolled and Annealed Mo Microalloyed bainitic Steel

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Journal of Harbin Institute of Technology(New Series) 2016年第4期23卷 52-58页

作者： Yi Zhang Guang Xu Li Wang Yaowen Xu Zhengliang Xue Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education Hubei Collaborative Innovation Center for Advanced SteelsWuhan University of Science and TechnologyWuhan 430081China State Key Laboratory of Development and Application Technology of Automotive Steels(Baosteel Group) Shanghai 201900China

Two kinds of low carbon bainitic steels,Nb-free Mo bearing and Nb + Mo addition steels,were cold rolled and annealed to investigate the effect of micro-alloying element Nb on the microstructure and properties of Mo microalloyed low carbon high strength bainitic steel. No precipitates were observed in Nb-free Mo bearing steel,whereas,two types of precipitates,i.e.,Nb( C,N) and composite( Nb,Mo)( C,N),were observed in the Nb + Mo microalloyed steel,resulting in precipitation strengthening. The strength of Mo bearing steel was improved by addition of Nb under the same annealing conditions. The grain size of Nb addition steel was almost the same as Nb-free steel. Unlike the obvious grain refinement and precipitation strengthening in hot rolling,the increase in yield strength of Nb addition steels in cold rolling and annealing mainly results from the precipitation strengthening,while the effect of grain refinement strengthening can be almost ignored.

关键词： recrystallization annealing low carbon bainitic steel Nb Mo cold rolling

CHARACTER OF CARBON-DEPLETED REGIONS IN UNDERCOOLED AUSTENITE AND THERMODYANMICS OF bainitic TRANSFORMATION

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Acta Metallurgica Sinica(English Letters) 1991年第1期4卷 1-7页

作者： YANG Quanmin KANG Mokuang Northwestern Polytechnical University,Xi’an,China YANG Quanmin,Dept.of Material Science and Engineering,Zhejiang University,Hangzhou 310027,China

The chemical driving forces for the phase transformation from austenite in three different car- bon-depleted regions into ferrite with the identical composition have been derived respectively. The starting temperature of bainitic transformation,B_s,has also been calculated according to the shearing mechanism of bainitic transformation in carbon-depleted regions of austenite. The maximum driving forces for banitic transformation at B_s in both 3% Cr and the CrMo steels were *** was shown that the proposed shearing mechanism of the bainitic trans- formation is thermodynamically possible.

关键词： bainitic transformation thermodynamics

Comparative Assessment on Machinability of Nano-Structured bainitic Steel and Titanium64

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Journal of Materials Science and Chemical Engineering 2014年第7期2卷 34-39页

作者： Ashwin Polishetty Chinmay Sonavane Prasad Patil Guy Littlefair Deakin University Waurn Ponds Victoria Australia Indian Institute of Technology Madras India

Titanium64 has characteristics well sought after for applications in demanding environments. In general, due to titanium64’s high performance, it is a material which requires careful and well considered machining approaches in order to optimize the process. Nano-structured bainitic steel whilst having different application bases does none the less have similar machining and machinability short comes as that of titanium64. These similar characteristics have been compared and contrasted in this research study using parameters including cutting force, surface texture and metallography. The results tend to indicate that titanium64 has a poorer machinability characteristics compared to nano-structured bainitic steel. However, in terms of achieving greater surface texture characteristics, the nano-structured bainitic steel exhibited an enhanced capacity.

关键词： Nano-Structured bainitic Steel Titanuim64 Machinability Surface Roughness Cutting Force

Corrosion Behavior of High-Strength Steel for Flexible Riser Exposed to CO_2-Saturated Saline Solution and CO_2-Saturated Vapor Environments

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Acta Metallurgica Sinica(English Letters) 2019年第5期32卷 607-617页

作者： Da-Zheng Zhang Xiu-Hua Gao Lin-Xiu Du Hong-Xuan Wang Zhen-Guang Liu Ning-Ning Yang R.D.K.Misra State Key Laboratory of Rolling and Automation Northeastern University Neptune Offshore Engineering Development Co. Ltd School of Material Science and Engineering Jiangsu University of Science and Technology Department of Metallurgical Materials and Biomedical Engineering University of Texas at El Paso

The corrosion behavior of high-strength steel used for flexible riser exposed to CO_(2-)saturated saline solution and CO_(2-) saturated vapor environments was studied through immersion experiment and electrochemical corrosion experiment. The corrosion behavior and mechanism of the tested steel were analyzed on the basis of corrosion kinetics, nature of corrosion products, corrosion product morphology, elemental distribution and polarization curves. The experimental results showed that the microstructure of the tested steel was bainitic microstructure. The corrosive activity of the tested steel exposed to CO_(2-) saturated vapor environment was significantly lower than that exposed to CO_(2-) saturated saline solution *** prolonging the exposure time, the corrosion rate gradually decreased, the corrosion heterogeneity increased, and the dimensions of FeCO_3 crystals gradually became small. At later stages of corrosion, the corrosion current density decreased significantly and the anodic Tafel slope increased, indicating that the corrosion process was strongly inhibited. The corrosion mechanism of low-alloy steel with bainitic microstructure was proposed based on experimental results.

关键词： Flexible riser High-strength bainitic steel CO2 corrosion Electrochemical behavior