正火冷却速率对0.92Mn-1.56Si-1.02Cr贝氏体钢组织与性能的影响  

Effects of Normalizing Cooling Rates on Microstructure and Properties of 0.92Mn-1.56Si-1.02Cr Bainitic Steel

作　　者：胡辰 于金瑞 张禹 安钰坤 赵而团[1] HU Chen;YU Jinrui;ZHANG Yu;AN Yukun;ZHAO Ertuan(School of Mechanical Engineering,Shandong University of Technology,Zibo 255000,China)

机构地区：[1]山东理工大学机械工程学院,山东淄博255000

出　　处：《热加工工艺》2025年第2期80-84,共5页Hot Working Technology

基　　金：山东省自然科学基金博士基金项目(ZR2019BEM004);周村区校城融合项目(2020ZCXCZH03)。

摘　　要：以0.92Mn-1.56Si-1.02Cr为研究对象,通过设置空冷、风冷及水雾冷却3种正火冷却方式,研究了不同正火冷却速率对贝氏体试验钢组织演变与力学性能的影响。结果表明:3种冷却速率下得到的显微组织均为贝氏体与马氏体复相组织;随着冷却速率的提高,显微组织细化,贝氏体平均板条厚度降低31%;组织中贝氏体含量降低,马氏体含量增加,0.44℃/s空冷后的贝氏体组织含量约为52.3%,1.48℃/s雾冷后降低至17.2%;贝氏体钢硬度与强度提高但塑性与韧性有所下降,断裂模式从韧性断裂向脆性断裂转变,正火冷却过程中在贝氏体转变区内以0.91℃/s的平均冷速风冷时,贝氏体含量为46.8%,此时,0.92Mn-1.56Si-1.02Cr贝氏体试验钢的综合力学性能最优。The effects of normalizing cooling rates on the microstructure evolution and mechanical properties of 0.92Mn-1.56Si-1.02Cr bainitic steel were studied by air cooling,air patenting and spray cooling.The results show that the microstructure obtained at three cooling rates is bainite and martensite multiphase microstructure.With the increase of cooling rate,the microstructure is refined and the average thickness of bainite lath decreases by 31%.The content of bainite decreases and the content of martensite increases.After 0.44℃/s air cooling,the content of bainite decreases to 52.3%,and after 1.48℃/s spray cooling,the content of bainite decreases to 17.2%.The hardness and strength of bainitic steel are improved,but the plasticity and toughness are decreased,and the fracture mode changes from ductile fracture to brittle fracture.The bainite content of the test steel is 46.8%when the average cooling rate is 0.91℃/s in the bainite transition zone during normalizing cooling,and the comprehensive mechanical properties of 0.92Mn-1.56Si-1.02Cr bainite steel are the best.

关 键 词：0.92Mn-1.56Si-1.02Cr贝氏体钢 冷却速率 组织演变 力学性能 

分 类 号：TG161[金属学及工艺—热处理]