Solidification microstructure of Cr4Mo4V steel forged in the semi-solid state

作     者：Weifeng Liu Yanfei Cao Yifeng Guo Mingyue Sun Bin Xu Dianzhong Li 

作者机构：Key Laboratory of Nuclear Materials and Safety AssessmentInstitute of Metal ResearchChinese Academy of SciencesShenyang 110016China College of Materials Science and EngineeringUniversity of Science and Technology of ChinaHefei 230026China Shenyang National Laboratory for Materials ScienceInstitute of Metal ResearchChinese Academy of SciencesShenyang 110016China 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2020年第38卷第3期

页      面：170-182页

核心收录：

学科分类：080503[工学-材料加工工程] 0817[工学-化学工程与技术] 0806[工学-冶金工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 0802[工学-机械工程] 0801[工学-力学（可授工学、理学学位）] 0702[理学-物理学] 080201[工学-机械制造及其自动化] 

基　　金：supported financially by the National Key Research and Development Program(No.2018YFA0702900) the National Natural Science Foundation of China(Nos.U1508215,51774265 and 51701225) the National Science and Technology Major Project of China(No.2019ZX06004010) the Key Program of the Chinese Academy of Sciences(No.ZDRW-CN-2017-1) the Program of CAS Interdisciplinary Innovation Team Gleeble engineer Jiajun He for her technical support in superhot experiments 

主　　题：Solidification Semi-solid forging Microstructure Eutectic carbides 

摘      要：Semi-solid forging of iron-based alloys during solidification has unique characteristics distinct from those of the classical hot *** the aim of acquiring precise knowledge concerning the microstructural evolution of bearing steel Cr4 Mo4 V in this process,a series of semi-solid forging experiments were carried out in which samples were wrapped in a designed pure iron *** effects of forging temperature and forging reduction on the grain morphology and liquid flow behavior were investigated,*** forging solidifying metal(FSM),bulky primary dendrites were broken and spheroidal grains with an average shape factor of 0.87 were obtained at 1360?*** the decreasing forging temperature to 1340?C,the microstructural homogeneity can be *** the other hand,it shows that a higher forging reduction(50%)is essential for the spheroidization of grains and elimination of liquid *** microstructural characteristics are related to different motion mechanisms of solid and liquid phases at different forging ***,the effect of semi-solid forging on the eutectic carbides was also investigated,and the results demonstrate that the higher diffusion capacity and less liquid segregation jointly lower the large eutectic carbides and consequently cause its uniform distribution during FSM.