固溶处理对Fe-Mn-Al-C钢组织及力学性能的影响  

Effect of solid-solution treatment on microstructure and mechanical performance of Fe-Mn-Al-C steel

作　　者：喇培清[1] 魏孔振 丁彦龙 王力[1] LA Pei-qing;WEI Kong-zhen;DING Yan-long;WANG Li(State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals,Lanzhou Univ.of Tech.,Lanzhou730050,China)

机构地区：[1]兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,甘肃兰州730050

出　　处：《兰州理工大学学报》2019年第2期1-9,共9页Journal of Lanzhou University of Technology

基　　金：国家自然科学基金(51561020)

摘　　要：通过XRD,OM,SEM,EDS,EPMA表征了不同铝质量分数(6%,8%,10%)的铸态Fe-Mn-Al-C钢经过不同温度固溶处理1 h后的组织,并对其性能进行了研究,结果表明:不同铝质量分数的Fe-Mn-Al-C钢的硬度经900、950、1 000℃固溶处理后,随固溶温度的升高硬度均表现为先增加后降低.3种钢的硬度在950℃固溶处理时表现为最大值,分别为240、298、337 HV.固溶温度升高时,3种铝质量分数的Fe-Mn-Al-C钢组织中铁素体相体积分数增加,奥氏体相的形貌发生变化;w(Al)=6%的Fe-Mn-Al-C钢的抗拉强度随固溶温度的升高而增大,1 000℃时达到最大值455 MPa;w(Al)=8%的Fe-Mn-Al-C钢抗拉强度随固溶温度升高而降低,但较铸态有所提高;900℃固溶时达到最大值504 MPa.The microstructure of as-cast Fe-Mn-Al-C steel with different aluminum mass-fraction (6%,8%,10%) after solid-solution treatment at different temperatures was characterized by means of XRD, OM, SEM ,EDS and EPMA, and its mechanical performance was investigated. The result showed that the hardness of Fe-Mn-Al-C steel with different aluminum mass-fraction and subjected to solid-solution treatment at 900, 950, and 1 000 ℃ would increase first and then decrease with the solid-solution temperature. The hardness of three kinds of steel would be the maximum when the steel was treated at 950 ℃, being 240, 298, 337 HV, respectively. When solid-solution temperature increased, the volume-fraction of the ferrite phase in Fe-Mn-Al-C steel with three aluminum mass-fraction would increase and the morphology of the austenite phase would change. The tensile strength of Fe-Mn-Al-C steel with w (Al)= 6% would increase with solid-solution temperature and reach a maximum of 455 MPa at 1 000 ℃. The tensile strength of Fe-Mn-Al-C steel with w (Al)=8% would decrease as solid-solution temperature increased, but it would still be higher to some extent than the as-cast one, reaching a maximum of 504 MPa at 900 ℃ of solid-solution temperature.

关 键 词：固溶处理 组织 力学性能 Fe-Mn-Al-C钢 

分 类 号：TG113[金属学及工艺—物理冶金]