淬回火与等温淬火对SAE6150钢组织和力学性能的影响  

Effects of Quench-Tempering and Austempering on Microstructure and Mechanical Properties of SAE6150 Steel

作　　者：王丙旭 张宇 崔威威 胡子瑞 WANG Bingxu;ZHANG Yu;CUI Weiwei;HU Zirui(Faculty of Mechanical Engineering and Automation,Zhejiang Sci-Tech University,Hangzhou 310018,China)

机构地区：[1]浙江理工大学机械与自动控制学院,浙江杭州310018

出　　处：《热加工工艺》2024年第8期19-22,共4页Hot Working Technology

基　　金：“机械工程”省重点建设学科重大重点成果培育计划项目(11130231742010)。

摘　　要：对SAE6150钢进行淬回火和等温淬火热处理试验,分析了不同回火温度和等温温度对其组织和性能的影响。结果表明,SAE6150钢的回火组织主要由回火马氏体和残余奥氏体组成。随回火温度的升高,回火马氏体板条状形态逐渐消失,渗碳体和合金碳化物尺寸增大,数量增多。经等温淬火后,组织以贝氏体为主,随等温温度的升高,铁素体形态由细针状变为羽毛状。力学性能方面,随回火温度的升高,SAE6150钢的硬度、屈服强度和抗拉强度减小,断面收缩率和伸长率增大。对比等温淬火和回火SAE6150钢的力学性能后发现,在断面收缩率和伸长率相近的情况下,低温等温淬火试样表现出更高的硬度和强度。The quench-tempering and austempering heat treatment tests were applied on SAE6150 steel.The effects of tempering temperature and austempering temperature on the microstructure and mechanical properties of SAE6150 steel were investigated.The results show that the microstructure of quench-tempered SAE6150 steel consists of tempered martensite and retained austenite.As increasing the tempering temperature,the plate-like morphology of tempered martensite gradually disappears,and the size and amount of cementite and alloy carbide increase.After receiving the austempering process,bainite is present in the matrix of SAE6150 steel.As increasing the austempering temperature,the morphology of ferrite is transformed from thin needle-like into feather-like shape.For mechanical properties,the hardness,yield strength and tensile strength decrease and area reduction and elongation increase with increasing the tempering temperature.By comparing the mechanical properties of austempered and quench-tempered SAE6150 steel,austempered specimens with low austempering temperature show higher hardness and strength under similar area reduction and elongation.

关 键 词：SAE6150钢 淬回火 等温淬火 微观组织 力学性能 

分 类 号：TG161[金属学及工艺—热处理]