摘要
冶炼不同铈含量的低铬铁素体不锈钢,锻造后采用不同的热处理制度进行热处理,在光学显微镜和扫描电镜下观察其组织。实验结果表明:铈可抑制试验钢的静态再结晶,提高再结晶温度,细化晶粒,晶粒平均尺寸由50μm下降到19μm;添加铈后不锈钢中的碳化物更细小、弥散。分析其机理:固溶铈在晶界的偏聚可起到对晶界的拖拽作用,降低晶界的迁移速度,影响再结晶行为;碳化物容易在晶界析出,细晶造成晶界增加,使得碳化物更细小、弥散。
Low chromium ferritic stainless steels with five different amounts of cerium were obtained. After being forged and carried out by different heat treatment methods, their microstructures were observed by optical microscopy and SEM. The results showed that by the addition of cerium the static recrystallization of the steel was depressed, and the recrystallization temperature was promoted. Furthermore, the grain size was reduced, and the average grain diameter was changed from 50 μm to 19 μm, and the smaller size and the dispersed carbides were acquired. The mechanism might be that the dissolved Ce had drag effects on grain boundary and decreased its migration velocity, which had impact on the static recrystallization behavior of the tested steels. The carbides tended to deposit at grain boundary, and the grain refining led to the increase in grain boundary, which made carbides smaller and dispersed.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2009年第1期123-127,共5页
Journal of the Chinese Society of Rare Earths
关键词
铈
铁素体不锈钢
碳化物
静态再结晶
稀土
cerium
ferritic stainless steels
carbide
static recrystallization
rare earths
