齿轮钢SAE5120H微观组织结构的相关研究  

Study on microstructure of gear steel SAE5120H

作　　者：倪磊 钱焕 Ni Lei;Qian Huan(Jiangyin Xingcheng Special Steel Works Co.Ltd.,Jiangyin 214400,Jiangsu,China)

机构地区：[1]江阴兴澄特种钢铁有限公司,江苏江阴214400

出　　处：《特钢技术》2024年第3期20-25,共6页Special Steel Technology

摘　　要：通过热模拟试验机、高温显微镜、扫描电镜和透射电镜等研究了SAE5120H钢的静态CCT曲线,奥氏体晶粒长大行为和析出相的表征。结果表明,该钢在冷却速度小于1℃/s时室温组织主要为铁素珠和珠光体,随着冷速增加,铁素珠和珠光体逐渐消失,产生贝氏体和马氏体,直至全部转变为马氏体;该钢伪渗碳温度为960℃不产生混晶;不同原始组织状态下奥氏体晶粒长大速率不同,以铁素珠加珠光体组织最快;晶粒均匀试样的微观析出相尺寸更加细小且弥散分布。The static CCT curve,austenite grain growth behavior and precipitated phase characterization of SAE5120H steel were studied by thermal simulation testing machine,high temperature microscope,scanning electron microscope and trans-mission electron microscope.The results show that when the cooling rate of the steel is less than 1℃/s,the main ferrite beads and pearlite are formed at room temperature.As the cooling rate increases,the ferrite beads and pearlite gradually disappear,and bainite and martensite are formed until all are transformed into martensite.The pseudo-carburizing temperature of the steel is 970℃and no mixed crystal is produced.The grain growth rate of austenite is different in different original microstructure,the ferrite and pearlite structure is the fastest.The micro precipitates in samples with uniform grain size are finer and more dispersed.

关 键 词：SAE5120H CCT曲线 奥氏体晶粒度 AlN析出相 

分 类 号：TF031[冶金工程—冶金物理化学]