黄竹平,胡正飞,王起江,刘偲展

• 1:同济大学材料科学与工程学院
• 2:宝钢研究院

摘要(Abstract)：

在650℃下对国产HR3C耐热钢进行了标准拉伸持久试验,采用外推法计算出该钢105h的持久强度极限达到104.98MPa。不同持久时间的样品硬度测试表明,随着持久时间增加,硬度上升,且晶界硬度高于晶内硬度。在持久时间2000 h左右达到峰值后开始缓慢下降,晶界和晶内硬度发生反转。断口观察显示,持久断裂的形态主要是沿晶断裂形态。利用SEM和EDS等对不同应力状态下的蠕变断裂试样微观组织进行了分析比较,随着持久时间的增加,耐热钢中析出相不断析出和长大,晶内析出细小弥散分布的NiCrN,起到显著的沉淀强化作用;晶界随持久时间延长明显宽化,准连续分布于晶界的主要碳化物M23C6长大速度快,明显降低晶界强度而弱化晶界表现出晶界脆化倾向,成为蠕变空洞形核地点。

关键词(KeyWords)： HR3C耐热钢;持久性能;析出相

Abstract:

Keywords:

基金项目(Foundation): 国家自然基金项目资助项目(50871076)

作者(Author): 黄竹平,胡正飞,王起江,刘偲展

DOI: 10.13289/j.issn.1009-6264.2013.11.012

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