Effect of RE on molybdenum partitioning and resultant mechanical and microstructural behavior of a duplex stainless steel during hot working condition  

作　　者：陈雷 马筱聪 王明家 薛红燕 

机构地区：[1]National Engineering Research Center for Equipment and Technology of Cold Strip Rolling,Yanshan University [2]School of Mechanical Engineering, Yanshan University [3]State Key Laboratory of Metastable Materials Science and Technology, Yanshan University

出　　处：《Journal of Rare Earths》2015年第1期107-112,共6页稀土学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(51101136);Natural Science Foundation of Hebei Province(E2012203013);National High Technology Research and Development of China(863 program,2010AA03A407);College Innovation Team Leader Training Program of Hebei Province(LJRC012)

摘　　要：The effect of rare earth（RE） on Mo partitioning and resultant mechanical and microstructural behavior of a duplex stainless steel during hot working condition was investigated. It was found that RE effect was sensitive to temperature. At the high temperature, the development of dynamic recovery（DRV） in α phase was slowed down while the dynamic recrystallization（DRX） process in γ phase was accelerated by RE, whereby both work hardening rate（at low strain） and dynamic softening rate（at high strain） increased and moreover, the discrepancy on the hardness of the both phase reduced. Whereas at the low temperature, the effect of RE was opposite as compared with those in the high temperature. Mo partitioning analysis by EPMA indicated that RE enhanced the partitioning of Mo in α phase while reduced Mo concentration in γ phase at higher temperature whereby the mismatch between two phases could be improved indicated by the elimination of voids and cracks at α/γ interface, but it was contrary to that at the low temperature. Mo partitioning was believed to be an important cause for the RE effect on the differences of mechanical and microstructural behavior. Also this result provided a reasonable evidence for micro-alloying of RE in DSSs.The effect of rare earth（RE） on Mo partitioning and resultant mechanical and microstructural behavior of a duplex stainless steel during hot working condition was investigated. It was found that RE effect was sensitive to temperature. At the high temperature, the development of dynamic recovery（DRV） in α phase was slowed down while the dynamic recrystallization（DRX） process in γ phase was accelerated by RE, whereby both work hardening rate（at low strain） and dynamic softening rate（at high strain） increased and moreover, the discrepancy on the hardness of the both phase reduced. Whereas at the low temperature, the effect of RE was opposite as compared with those in the high temperature. Mo partitioning analysis by EPMA indicated that RE enhanced the partitioning of Mo in α phase while reduced Mo concentration in γ phase at higher temperature whereby the mismatch between two phases could be improved indicated by the elimination of voids and cracks at α/γ interface, but it was contrary to that at the low temperature. Mo partitioning was believed to be an important cause for the RE effect on the differences of mechanical and microstructural behavior. Also this result provided a reasonable evidence for micro-alloying of RE in DSSs.

关 键 词：duplex stainless steel rare earths partitioning hot working 

分 类 号：TG142.71[一般工业技术—材料科学与工程] O614.33[金属学及工艺—金属材料]