王驰,冉广,雷鹏辉,陈芙梁

• 1:厦门大学能源学院

摘要(Abstract)：

在20~600℃范围内对国产SA-182 F304钢进行了温度效应下的拉伸行为研究。采用光学显微镜、透射电镜、扫描电子显微镜、XRD以及显微硬度仪对原始态和拉伸断裂试样进行了微观组织与微观化学分析与表征。试验结果表明,在晶粒度为5.5级的钢基体中分布着粗系、moy级别为1.5级的B类和细系、moy级别为1.0级的D类宏观夹杂物,分别占0.0317%和0.0158%,这些夹杂物容易出现在拉伸断口的韧窝处。钢基体中分布着大量平行与缠结的位错,析出相主要为FCC结构的Ti(Cr,Fe,Mn)_2。屈服强度、拉伸强度和伸长率随着温度的升高而降低,而断面收缩率却保持在80%左右,表现出良好的塑性,断口以韧窝为主。拉伸导致了钢基体的显微硬度显著提高,比原始态钢的相应值提高了约一倍。显微硬度的增加来源于钢基体中的位错增殖,而非相变的结果,拉伸并没有导致奥氏体向马氏体发生明显转变。随着拉伸温度升高,奥氏体晶粒的回复加剧,位错密度逐渐降低,纤维状的组织明显降低。

关键词(KeyWords)： SA-182 F304钢;拉伸性能;微观组织;核反应堆

Abstract:

Keywords:

基金项目(Foundation): 十二五国家科技重大专项子项目(2012ZX06004-001-07-01)

作者(Author): 王驰,冉广,雷鹏辉,陈芙梁

DOI: 10.13289/j.issn.1009-6264.2016.12.012

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