曾周燏,陈礼清,朱伏先,刘相华

• 1:东北大学轧制技术及连轧自动化国家重点实验室

摘要(Abstract)：

通过热力学软件计算、组织观察以及显微硬度测定,研究固溶温度为850～1200℃时403Nb耐热钢中析出相的溶解与析出行为。结果表明:该耐热钢在高温下主要存在M23C6和MX两种类型碳化物;其中,M23C6型碳化物在900℃左右就完全溶解,而MX型碳化物则相对较稳定,在固溶温度超过1000℃时才开始缓慢溶解。随着固溶温度的升高,MX型碳化物颗粒逐渐减少且颗粒平均尺寸不断长大,但其中非平衡成分的低Nb含量MX型碳化物不断溶解,而平衡成分的高Nb含量MX型碳化物则不断长大。在固溶温度为1150℃时,403Nb钢中开始析出对性能不利的δ铁素体,且随固溶温度的升高,δ铁素体含量逐渐增多。

关键词(KeyWords)： 403Nb;固溶热处理;碳化物;δ铁素体

Abstract:

Keywords:

基金项目(Foundation): 中央高校基本科研业务费(N100507003);; 国家自然科学基金重点项目(50634030)

作者(Author): 曾周燏,陈礼清,朱伏先,刘相华

DOI: 10.13289/j.issn.1009-6264.2012.11.018

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