摘要
:采用X射线衍射和透射电镜等手段,对高温下析出硬化型热强钢中合金元素的再分配行为及其作用机制进行了分析和探讨,并利用余氏理论分析了该钢的价电子结构,阐述了高温下钴的作用机制。结果表明:在700℃的高温下,钢中的合金元素会逐渐析出并形成碳化物等析出相;在700℃下保持600h后,钢中全部的钼、钨、碳及部分的铬、微量的钴和钒等脱溶析出,形成μ相、Laves相、MC、M23C6和M6C等析出相,产生析出强化作用。而大部分的钴、铬和少量的钒保留在基体中起固溶强化作用。价电子结构计算结果表明,钴增强了基体晶格的键合力,同时也提高了回火抗力。
The redistribution of alloying elements in hot work steel were analyzed with X-ray diffraction and TEM, and especially the mechanism of cobalt behavior was analyzed with the valence structure of the steel calculated with Empirical Electron Theory for Solids. The result showed that elements in the steel are precipitated from matrix gradually and intermetallic compounds and carbides are formed when the steel is kept at 700 ℃. After holding at 700 ℃ for 600 h, almost all of molybdenum, tungsten and carbon and part of chromium, cobalt and vanadium are separated out from matrix. Phase μ, phase Laves and M_(23)C_6, M_6C and MC are formed, which causes dispersion strengthening. Whereas most cobalt, chromium and some vanadium which stay in the matrix, play a role in solution strengthening. The results of valence structure calculation showed that cobalt enhances the bonding forces of α-Fe atoms and tempering resistance of the steel.
出处
《钢铁研究学报》
CAS
CSCD
北大核心
2004年第1期44-48,共5页
Journal of Iron and Steel Research
关键词
热强钢
合金元素
析出相
价电子结构
硬化型
hot work steel
alloying element
precipitated phase
valence electron structure
