战国锋,刘继雄,肖建中,周桂峰,刘文斌

• 1:武钢(北京)新材料研究中心
• 2:华中科技大学材料科学与工程学院
• 3:武汉钢铁(集团)公司研究院

摘要(Abstract)：

通过实验研究了Cu元素及热处理工艺对9Ni低温钢组织与力学性能的影响。结果表明,添加Cu元素后,材料的低温冲击韧性明显得到提升,而抗拉强度和屈服极限变化不大。调质热处理后,材料的力学性能及低温冲击性能均明显得到改善。通过光学显微镜观察发现,热轧态的9Ni钢微观组织主要为淬火马氏体,经热处理后则主要为回火马氏体;进一步通过扫描电镜观察可以发现,调质热处理后,材料的基体组织为回火马氏体,在基体上分布着白亮色的粒状和板条状的淬火马氏体和回转奥氏体混合物。通过X射线衍射检测发现,添加Cu元素后回转奥氏体的数量增加。Cu对9Ni钢低温韧性的改善主要有以下两方面原因:一是钢中Cu、Ni等元素的富集大大提高了回转奥氏体的稳定性并增加了其含量,二是Cu元素的添加使回转奥氏体在晶内、晶界的分布更加均匀、弥散,从而提高了9Ni钢的低温韧性。

关键词(KeyWords)： 低温钢;9Ni;微观组织;热处理

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 战国锋,刘继雄,肖建中,周桂峰,刘文斌

DOI: 10.13289/j.issn.1009-6264.2015.08.025

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