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Influence of prior austenite grain size on the critical strain for completion of DEFT through hot compression test

Journal of University of Science and Technology Beijing 2006年第2期13卷 135-138页

作者： Jing Tian Wangyue Yang Zuqing Sun Jianping He Materials Science and Engineering School University of Science and Technology Beijing Beijing 100083 China Radioactivity School Taishan Medical University Tai＇an 271016 China State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing 100083 China

A low carbon steel was used to determine the critical strain εc for completion of deformation enhanced ferrite transformation （DEFT） through a series of hot compression tests. In addition, the influence of prior austenite grain size （PAGS） on the critical strain was systematically investigated. Experimental results showed that the critical strain is affected by PAGS. When γ→α transformation completes, the smaller the PAGS is, the smaller the critical strain is. The ferrite grains obtained through DEFT can be refined to about 3 μm when the DEFT is completed.

关键词： low carbon steel hot compression deformation enhanced ferrite transformation critical strain prior austenite grain size

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Effect of deformation parameters on the austenite dynamic recrystallization behavior of a eutectoid pearlite rail steel

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International Journal of Minerals,Metallurgy and Materials 2024年第5期31卷 833-841页

作者： Haibo Feng Shaohua Li Kexiao Wang Junheng Gao Shuize Wang Haitao Zhao Zhenyu Han Yong Deng Yuhe Huang Xinping Ma Institute for Carbon Neutrality University of Science and Technology BeijingBeijing 100083China Institute for Steel Sustainable Technology Liaoning Academy of MaterialsShenyang 110004China Pangang Group Panzhihua Iron and Steel Research Institute Co.Ltd. Panzhihua 617000China

Understandings of the effect of hot deformation parameters close to the practical production line on grain refinement are crucial for enhancing both the strength and toughness of future rail steels.In this work,the austenite dynamic recrystallization(DRX)behaviors of a eutectoid pearlite rail steel were studied using a thermo-mechanical simulator with hot deformation parameters frequently employed in rail production lines.The single-pass hot deformation results reveal that the prior austenite grain sizes(PAGSs)for samples with different deformation reductions decrease initially with an increase in deformation temperature.However,once the deformation temperature is beyond a certain threshold,the PAGSs start to increase.It can be attributed to the rise in DRX volume fraction and the increase of DRX grain with deformation temperature,respectively.Three-pass hot deformation results show that the accumulated strain generated in the first and second deformation passes can increase the extent of DRX.In the case of complete DRX,PAGS is predominantly determined by the deformation temperature of the final pass.It suggests a strategic approach during industrial production where part of the deformation reduction in low temperature range can be shifted to the medium temperature range to release rolling mill loads.

关键词： eutectoid pearlite rail steel prior austenite grain size dynamic recrystallization single-pass hot deformation three-pass hot deformation

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Effect of heat treatments on Charpy impact properties of 15Cr12MoVWN ferritic/martensitic steel

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Journal of Iron and Steel Research(International) 2022年第3期29卷 512-518页

作者： Ting-wei Ma Xian-chao Hao Ping Wang Key Laboratory of Electromagnetic Processing of Materials Ministry of EducationNortheastern UniversityShenyang110819LiaoningChina Yingkou Institute of Technology Yingkou115014LiaoningChina CAS Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang110016LiaoningChina

The Charpy impact properties of 15Cr12MoVWN ferritic/martensitic steel for sodium-cooled reactors with variation in heat treatment factors and parameters are reported.The results show that the ductile-to-brittle transition temperature(DBTT)increased and the upper shelf energy(USE)decreased with increase in normalizing temperature.However,the variation tendency of DBTT and USE was the opposite with increase in tempering temperature.The tempering temperature showed a greater influence on USE than the normalizing temperature,and normalizing and tempering temperatures had the equally significant effects on DBTT,but the cooling method was not a significant factor for DBTT and USE.The prior austenite grain and M_(23)C_(6) size were the main influences on DBTT,and the dislocation density was the main factor affecting the variation of USE.The heat-treatment regime recommended for 15Cr12MoVWN steel was composed of normalizing at 1000-1050℃ for 0.5 h followed by water quenching or air cooling and tempering at 760℃ for 1.5 h.

关键词： 15Cr12MoVWN steel Ductile-to-brittle transition temperature prior austenite grain size M23C6-MX

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Effect of Mo content on nano-scaled particles,prior austenite grains and impact toughness of CGHAZ in offshore engineering steels

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Journal of Iron and Steel Research(International) 2022年第5期29卷 846-858页

作者： De-kun Liu Jian Yang Yin-hui Zhang Long-yun Xu State Key Laboratory of Advanced Special Steel School of Materials Science and EngineeringShanghai UniversityShanghai200444China

The effect of Mo on nano-scaled particles,prior austenite grains and impact toughness of coarse-grained heat-affected zone(CGHAZ)in offshore engineering steels with Ca deoxidation was studied.The heat-affected zone(HAZ)toughness of Mo16 steel is obviously higher than that of Mo8 steel at all the heat inputs of 50,100,150 and 200 kJ/cm,with HAZ toughness of both steels decreased with increasing the welding heat input.When the Mo content is increased from 0.08 to 0.16%,the size of nano-scaled particles in HAZ is decreased from 18 to 15 nm,and their number density is increased from 0.7 to 0.9μm^(−2).Thus,the Zener pinning force is increased,and the prior austenite grain size(PAGS)is decreased,leading to the improved HAZ toughness.Microstructural characterizations show that the nano-scaled particles in both steels are Ti(C,N)with the solute elements of Nb and Mo.The calculated critical particle size of TiN is 10.2 and 8.4 nm in Mo8 and Mo16 steels at 1350℃,and the particles larger than the critical size are stable during the welding process.From the Zener pinning force calculation,Ti(C,N)particles play the more important role in the pinning effect on the prior austenite grain growth.Based on the regression analysis by the MATLAB results,the predicted values of PAGS at different heat inputs are well fitted with the experimental data.

关键词： Mo content Nano-scaled particle prior austenite grain size CGHAZ Impact toughness Offshore engineering steel

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DWTT in Thicker Gauge Hot Rolled Coils for Line Pipe Application

DWTT in Thicker Gauge Hot Rolled Coils for Line Pipe Applica...

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“第十届中国钢铁年会”暨“第六届宝钢学术年会”

作者： Pradeep Agarwal Gunna Venkata Ramana Devasish Mishra Ashish Chandra Gajraj Singh Rathore JSW Steel Ltd. Vijayanagar Works.

Ductile failure in DWTT（Drop Weight Tear Test） at subzero temperatures is one of the key requirements for line pipe steels. As the temperature drops or thickness increases, the ductile failure mode is difficult to achieve in DWTT testing. JSW Steel has successfully developed new generation Nb-microalloyed line pipe steels for heavy gauges（up to 20mm） for grades up to API X-80 grade for the first time in India through hot strip mill. It has been observed that prior austenite grain boundaries act as major crack arresters due to the high angle of misorientation at the grain boundaries. In order to achieve ductile DWTT failure, the crack propagation by brittle Griffith cracks needs to be arrested by high angle boundaries with their interspacing lesser than that of the critical Griffith crack length. Hence refinement of prior austenite grain size which requires optimization of multiple dynamic and static recrystallisation phenomena coupled with reduced grain growth at rolling temperatures, leads to improved DWTT performance. This paper describes the various aspects of steel chemistry design and the hot rolling process optimization to achieve subzero temperature DWTT in thicker gauge line pipe steels. Multiple online trials have been conducted at JSW Steel, Vijayanagar works for achieving the same, such that the effects of chemistry and process variables on final microstructures and mechanical properties have been established. Further, a correlation table has been prepared for predicting DWTT transition temperature based on the largest prior austenite grain size in the transfer bar microstructure before entering into the finishing mill. This table has proven to be very useful in alloy design and in optimizing hot rolling process window to achieve superior DWTT performance for different end thicknesses in line pipe steels.

关键词： DWTT（drop weight tear test） dynamic recrystallisation static recrystallisation prior austenite grain size

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