Homogenous strength-toughness match for 20Mn2SiCrMoV bainitic large-size parts via processing of VC particles and quenching control  

作　　者：Yu Tian Zhun-Li Tan Jin-Zhou Zhang Zheng-Yuan Yuan Min Zhang Bing-Zhe Bai 

机构地区：[1]Material Science&Engineering Research Center,School of Mechanical,Electronic and Control Engineering,Beijing Jiaotong University,Beijing,100044,China [2]Key Laboratory of Advanced Materials of Ministry of Education,School of Materials Science and Engineering,Tsinghua University,Beijing,100084,China

出　　处：《Rare Metals》2023年第10期3485-3496,共12页稀有金属（英文版）

基　　金：financially supported by the Fundamental Research Funds for the Central Universities (No. 2019JBZ103)。

摘　　要：The problem of insufficient hardenability in general large-size parts always occurs in product manufacturing because of their large size,etc.It is restricted mainly by its own alloy composition with micro-alloy and key quenching and partitioning(Q&P) process.The relationship between the cooling rate and properties of small samples was analyzed as the basis of the initial cooling rate at different positions corresponding to large-size parts combined with controlled austenization temperature in this work.Typical as-treated micro structure after a fast cooling rate is mainly composed of lath bainite,martensite,and retained austenite(RA),while bainite and RA after a slow cooling rate.Simulations showed that cooling control via decreasing spray intensity,meeting higher strength at the surface,and good strength and toughness match can be obtained both at the surface and in the center.As-treated large ring part has~1330 MPa tensile strength and~95 J impact energy at the surface,and meantime,~1191 MPa tensile strength and~70 J impact energy in the center,which narrows the property difference.

关 键 词：Large-size parts Property homogeneity Cooling control BAINITE VC 

分 类 号：TG156.3[金属学及工艺—热处理] TG142.1[金属学及工艺—金属学]