摘要
通过OM、SEM及TEM分析了H13钢在电渣锭退火、锻后退火及淬回火过程中的显微组织变化,利用电解法萃取H13钢在三种状态下的碳化物,通过XRD对其进行物相分析,并与JMatPro热力学相图计算结果进行比较。研究表明:H13钢电渣锭中的伪共晶碳化物主要为V8C7与Fe3Mo3C;在锻造加热过程中,Fe3Mo3C溶于基体,并在锻后退火和淬回火的过程中重新从基体中析出,大部分V8C7溶于基体,少量未溶颗粒保留于锻后退火组织及淬回火组织中;淬回火过程中大量析出以V8C7、Mo2C为主的二次硬化型碳化物,上述结果与JMatPro计算结果基本符合。
Carbides and microstructure in H13 steel under three different states （i. e. annealed electroslag remeh （ESR） ingot, annealing and tempering）were studied by means of OM, SEM and EDS. The carbides are extracted by electrolysis process and analyzed by XRD and TEM.The results show that pseudo-eutectic carbides are mainly VaC7 and Fe3Mo3C in annealed H13 ESR ingot. All of Fe3Mo3C carbides dissolve into austenitic matrix, while Vs C7 carbides partly dissolve during the reheating of the ESR ingot for hot forging. Some Vs C7 carbides remaine in the steel during forging and hardening processes and keep in the final hardened and tempered state, in which the secondary hardening carbides of Vs C7 and Mo2 C are dominant. Besides, JMatPro software is also used to study the evolution of the carbides and the calculated results are in aggrement with experiments.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2009年第5期122-126,共5页
Transactions of Materials and Heat Treatment
基金
上海市重点学科建设项目(70101)
上海市科委登山项目(065211028)
关键词
H13钢
伪共晶碳化物
二次硬化
H13 steel
pseudo-eutectic carbide
secondary hardening
