王学,潘乾刚,陈方玉,陶永顺,彭芳芳

• 1:武汉大学动力与机械学院
• 2:东方锅炉(集团)有限公司
• 3:武汉钢铁集团公司技术中心

摘要(Abstract)：

对650℃,100 MPa条件下蠕变1546.5 h的P92钢试样进行了组织热损伤及应变损伤观察,分析了蠕变孔洞形成机理。结果表明,分布于板条间的M23C6相的粗化不明显,保持较高的数量密度,晶界上粗大的M23C6相大部分消失,导致其体积分数明显减少。在晶界上析出密集分布的的Laves相,平均等效直径为320 nm,体积分数约为2.6%。在晶界上形成了单个分布的蠕变孔洞,蠕变孔洞的形成与晶界上析出Laves相密切相关。由于Laves相分布于晶界,其沉淀强化作用不大,使基体合金元素贫化,促进蠕变孔洞的形成而降低P92的蠕变断裂强度。要进一步提高新型马氏体热强钢蠕变性能的关键是抑制Laves相在晶界的析出。

关键词(KeyWords)： P92钢;耐热钢;蠕变;损伤

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 王学,潘乾刚,陈方玉,陶永顺,彭芳芳

DOI: 10.13289/j.issn.1009-6264.2010.02.030

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