摘要
对0.23C-1.79Al-1.50Mn实验钢进行了不同碳分配时间的淬火-碳分配(Q-P)处理,通过SEM、TEM分析,结合JMatPro 6.0软件热力学计算,对实验钢的碳化物析出进行了研究。结果表明:实验钢室温组织中的碳化物来源于熔炼凝固、锻轧及轧后缓冷,以及Q-P处理奥氏体化、初始淬火、碳分配回火等工艺阶段,其中高温析出碳化物尺寸粗大,形貌不规则,轧后冷却及碳分配回火析出的碳化物以颗粒状弥散分布,结构类型主要为MC、M7C3或M23C6型,ε过渡型碳化物则因初始马氏体自回火而析出,并随合金碳化物的持续析出与长大而被促进溶解;碳分配回火处理时,细小碳化物短时等温即可弥散析出,并具有良好的持续析出行为,析出与长大同时进行;实验钢中,Nb、Ti主要发生高温析出,其碳分配回火析出能力较弱,Cr和Mo是碳分配回火析出主要元素。
0.23C-1.79Al-1.50Mn experimental steel was treated by quenching-partitioning carbon(Q-P)with different time of carbon partitioning.The carbide precipitation of experimental steel was studied by SEM,TEM analysis and JMatPro 6.0 thermodynamic calculation software.The results show that the carbides in the microstructure of the experimental steel at room temperature are from melting solidification,forging rolling and slow cooling after rolling,as well as austenitizing of Q-P treatment,initial quenching and carbon distribution tempering,and so on.The carbides precipitated at high temperature are coarse in size and irregular in morphology.The carbides precipitated during cooling after rolling and carbon distribution tempering are granular and dispersed,and the main structural types are MC,M7C3 or M23C6.εtransition carbides precipitates due to the self-tempering of the initial Martensite,and dissolves with the continuous precipitation and growth of the alloying carbide.The fine carbides can disperse in a short time during partitioning carbon and have a good continuous precipitation behavior.Precipitation and growth occurs simultaneously.The precipitation ability of Nb and Ti is weak,which mainly occurs at high temperature.Cr and Mo are the main elements of carbon distribution tempering precipitation.
作者
黄琼
康人木
谢东
HUANG Qiong;KANG Renmu;XIE Dong(Deyang Product Quality Supervision&Inspection Institute,Deyang 618000,China)
出处
《机械》
2021年第10期72-80,共9页
Machinery
