临界退火结合回火处理Fe_(69.4)Mn_(10)Co_(10)Cr_(10)N_(0.6)多主元合金的组织与性能  

Microstructure and properties of Fe_(69.4)Mn_(10)Co_(10)Cr_(10)N_(0.6)multi-principal element alloys processed by intercritical annealing and subsequent tempering

作　　者：张浩[1] 武文韬 张宁[2] 贾楠[1] ZHANG Hao;WU Wentao;ZHANG Ning;JIA Nan(Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education),School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China;Analytical and Testing Center,Northeastern University,Shenyang 110819,China)

机构地区：[1]东北大学材料各向异性与织构教育部重点实验室,材料科学与工程学院,辽宁沈阳110189 [2]东北大学分析测试中心,辽宁沈阳110819

出　　处：《中南大学学报（自然科学版）》2024年第8期2980-2990,共11页Journal of Central South University:Science and Technology

基　　金：国家重点研发计划项目(2021YFA1200203);国家自然科学基金资助项目(51922026)。

摘　　要：采用接近Ac3温度的临界退火及不同温度的低温回火处理制备一系列Fe_(69.4)Mn_(10)Co_(10)Cr_(10)N_(0.6)多主元合金。研究结果表明:经临界退火的合金由均匀分布的亚微米级超细铁素体和奥氏体晶粒以及奥氏体晶粒中的淬火马氏体板条组成。临界退火合金经不同温度的回火处理后,铁素体和奥氏体晶粒尺寸显著增加到微米级,合金的室温屈服强度和抗拉强度同时增加,塑性基本维持不变。这归因于:一方面,在回火过程中,Mn和N元素的配分增加了合金中奥氏体的稳定性;另一方面,回火后软区铁素体和硬区马氏体之间的异质界面增多,使得材料在拉伸变形过程中具有更显著的异质形变诱导强化和硬化效应。其中,经300℃回火处理合金的屈服和抗拉强度分别达到690 MPa和1400 MPa左右,同时保持了17%的均匀伸长率和26%的断裂伸长率。A series of Fe_(69.4)Mn_(10)Co_(10)Cr_(10)N_(0.6)multi-principal element alloys were processed by intercritical annealing near Ac3 temperature and the subsequent tempering at different low temperatures.The results show that the alloy processed by intercritical annealing consists of uniformly dispersed submicron-sized ultrafine ferrite and austenite grains,as well as the quenched martensite laths in the austenite.After tempering at different temperatures,the average grain sizes of ferrite and austenite in the intercritical annealed alloy significantly increase to the micron scale,and the room-temperature yield strength and tensile strength of the alloy increase simultaneously,while the ductility remains almost the same.This is attributed to the fact that the partition of Mn and N during tempering enhances the stability of austenite,and the increase of heterogeneous interfaces between ferrite(soft domains)and martensite(hard domains)after tempering contributes to the more significant hetero deformation induced strengthening and hardening during the tensile deformation.The room-temperature yield strength and tensile strength of the alloy tempered at 300℃reach approximately 690 MPa and 1400 MPa,respectively,while a uniform elongation of 17%and a total elongation of 26%are maintained.

关 键 词：多主元合金 临界退火 回火 微观组织 力学性能 

分 类 号：TG156.21[金属学及工艺—热处理]