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OALib Journal期刊
ISSN: 2333-9721
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18cr10ninb耐热钢析出相的热力学计算和平衡相分析
Keywords: 金属材料关,？奥氏体耐热钢,？18cr10ninb,？析出相,？热力学计算
Abstract:
？将18cr10ninb耐热钢在650℃进行10,000h的时效试验,用扫描电镜和透射电镜分析了18cr10ninb奥氏体耐热钢的组织,通过热力学计算研究了500--1400℃碳、铌和氮含量的变化对平衡析出相的影响。结果表明:在18cr10ninb钢的时效过程中在晶内析出了富nb的mx相,在晶界析出了富cr的m23c6相。根据热力学计算,其平衡析出相为mx,m3c6和σ相。mx相和m23c6型碳化物的最高溶解温度分别约为1340℃和840℃。mx相的数量随c和nb含量的提高而增加。σ相的数量随着c含量的提高而减少。添加0.2%的n元素后,mx相为含有n、nb、cr和少量c的复杂碳氮化物,且在其平衡组织中出现了cr2n相。
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