李海昭,梁军,徐连勇,王斌

• 1:神华国华(北京)电力研究院有限公司电站高温材料微创寿命评估中心
• 2:天津大学材料科学与工程学院

摘要(Abstract)：

采用光学显微镜、扫描电镜和冲击试验等研究了9Cr3W3Co钢经1075℃多次循环正火处理后的显微组织和冲击韧性。结果表明:多次循环正火处理可显著细化9Cr3W3Co钢的晶粒尺寸,提高了合金的冲击韧性。晶粒尺寸由1次正火处理的38.05μm,降为5次循环正火处理的25.73μm;冲击功由1次正火处理的51.69 J,增加为4次循环正火处理的110.75 J,5次循环正火处理的95.60 J。循环正火处理后试样观察到大量富W和Fe元素的Laves相,且Laves相尺寸随正火循环次数的增加而增大。冲击功随正火循环次数的增加先增大后减小,与合金奥氏体的晶粒尺寸和析出Laves相的尺寸相关。

关键词(KeyWords)： 循环正火处理;9Cr3W3Co钢;Laves相;冲击韧性。

Abstract:

Keywords:

基金项目(Foundation): 重点基础材料提升与产业化重点专项(2017YFB0305205)

作者(Author): 李海昭,梁军,徐连勇,王斌

DOI: 10.13289/j.issn.1009-6264.2017-0323

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