深层渗碳对H13钢显微组织和硬度的影响  

Effect of deep carburization on microstructure and hardness of H13 steel

作　　者：邓德伟[1,2,3] 刘海英[1] 张林[2] 孙奇[2] 杨树华[2] 宋茂付 郑海彤[1] 张敏[1] DENG De-wei LIU Hai-ying ZHANG Lin SUN Qi YANG Shu-hua SONG Mao-fu ZHENG Hai-tong ZHANG Min(School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China R＆D Division of Shenyang Blower Works Group Corporation, Shenyang 110869, China Key Laboratory of Solidification Control and Digital Preparation Technologv（Liaoning Province）. Dalian 116024. China)

机构地区：[1]大连理工大学材料科学与工程学院,辽宁大连116024 [2]沈阳鼓风机集团股份有限公司研究院,辽宁沈阳110869 [3]辽宁省凝固控制与数字化制备技术重点实验室,辽宁大连116024

出　　处：《材料热处理学报》2017年第3期186-192,共7页Transactions of Materials and Heat Treatment

基　　金：国家"973"项目(2011CB013402);辽宁省自然科学基金(2014028002);辽宁省科技创新重大专项(201303002);辽宁重大装备制造协同创新中心;沈鼓-大工重大科研发展基金;中央高校基本科研业务费专项资金资助项目

摘　　要：采用OM、TEM和XRD对深层渗碳处理后H13钢的显微组织进行观测,研究了深层渗碳对H13钢显微组织和硬度的影响。结果表明:渗碳后完全退火试样与渗碳后球化退火试样的渗碳层厚度均在3 mm以上,组织细密均匀,硬度提高30%~60%;渗碳后球化退火试样的晶粒更细小,基体上碳化物弥散分布并存在较多的亚结构,且表面硬度稍高于渗碳后完全退火试样。最佳深层渗碳处理工艺为1000℃下固体渗碳4 h,接着进行球化退火(840℃保温4 h,炉冷到740℃再保温4 h,炉冷到500℃后空冷到室温),然后进行1030℃淬火10 min,最后进行560℃回火2次,每次2 h。Microstructure of H13 steel after deep carburizing were studied by means of OM,TEM and XRD,and the effect of deep carburization on its hardness and microstructure was studied. The results show that after deep carburizing,the thickness of the carburizing layer of the steel is more than 3 mm,having refined microstructure,and the hardness of the steel increases by 30%-60%. After spheroidizing annealing,finer crystal grains,dispersive carbides and more sub-structures distributed in the matrix are obtained,and the carburizing sample exhibits slightly higher surface hardness than that of the full annealing sample. Therefore,the optimum deep carburization process in this work is solid carburizing at 1000 ℃ for 4 h,and then spheroidizing annealing at 840 ℃ for 4 h,furnace cooling to 740 ℃ for4 h,furnace cooling to 500 ℃,air cooling to room temperature,and then oil quenching at 1030 ℃ for 10 min,finally tempering at 560 ℃for twice,each for 2 h.

关 键 词：H13钢 深层渗碳 球化退火 完全退火 碳化物 

分 类 号：TG156.8[金属学及工艺—热处理]