Microstructure and mechanical properties of 20Si2CrNi3MoV steel treated by HDQP process  

作　　者：Chuan-feng Meng Lei Zhang Cun-yu Wang Yu-jie ghang Ying-hui Wei Yi-de Wang Wen-quan Cao 

机构地区：[1]School of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,Shanxi,China [2]Taiyuan Iron and Steel(Group)Co.,Ltd.,Taiyuan 030003,Shanxi,China [3]Central Iron&Steel Research Institute(CISRI),Beijing 100081,China [4]School of Materials Science and Engineering,University of Science&Technology Beijing,Beijing 100083,China

出　　处：《Journal of Iron and Steel Research International》2017年第11期1137-1142,共6页

基　　金：supported by the National Key Research and Development Plan(Nos.2017YFB0304401 and 2016YFB0101605);the Major State Basic Research Development Program of China(973Program)(No.2010CB630803)

摘　　要：A combined process of hot-deformation plus two-step quenching and partitioning （HDQP） treatment was applied to a low carbon 20Si2CrNi3MoV steel, and transmission electron microscopy （TEM）, scanning electron microscopy （SEM）, X-ray diffraction （XRD）, Vickers hardness and tension test were used to characterize the microstructure and mechanical properties. More stable retained austen ite due to fine microstructures and typical curved micromorphology is obtained, and the newly-treated steel obtains more retained austenite because of the effect of hot deformation. The retained austenite fraction increases and then decreases with the increasing quenching temperature from 200 to 350 ℃. The maximum retained austenite fraction （18.3 % ） and elongation （15 % ） are obtained to enhance the ductility.A combined process of hot-deformation plus two-step quenching and partitioning （HDQP） treatment was applied to a low carbon 20Si2CrNi3MoV steel, and transmission electron microscopy （TEM）, scanning electron microscopy （SEM）, X-ray diffraction （XRD）, Vickers hardness and tension test were used to characterize the microstructure and mechanical properties. More stable retained austen ite due to fine microstructures and typical curved micromorphology is obtained, and the newly-treated steel obtains more retained austenite because of the effect of hot deformation. The retained austenite fraction increases and then decreases with the increasing quenching temperature from 200 to 350 ℃. The maximum retained austenite fraction （18.3 % ） and elongation （15 % ） are obtained to enhance the ductility.

关 键 词：Quenching and partitioning Hot deformation Elongation Martensite Retained austenite 

分 类 号：TG142.1[一般工业技术—材料科学与工程] TG161[金属学及工艺—金属材料]