王珏,温洪,王章忠,王子,张梦姣,尚晓娟,赵岁春

• 1:江苏省先进结构材料与应用技术重点实验室
• 2:南京工程学院材料工程学院

摘要(Abstract)：

通过高温拉伸和持久实验研究了非调质钢MFT8的高温力学性能,用扫描电子显微镜观察高温拉伸和持久实验试样的断口形貌及组织演变规律。结果表明,从室温至500℃范围内,MFT8钢晶粒尺寸、析出相形貌未发生明显变化,高温强度的降低主要由于位错强化作用的减弱;在450℃条件下,MFT8钢具有以穿晶断裂和高塑性为代表的低温蠕变特点,材料内部虽然出现部分蠕变孔洞,但导致蠕变断裂的主要原因为析出相颗粒处应力集中引起的楔形开裂;对持久数据的线性外推得出,MFT8钢450℃在10万小时的持久强度为184.4 MPa。

关键词(KeyWords)： 非调质钢;MFT8;持久性能

Abstract:

Keywords:

基金项目(Foundation): 江苏省大学生科技创新项目(201311276025Y);; 江苏省高校科研成果产业化推进项目(JHB2011-25)

作者(Author): 王珏,温洪,王章忠,王子,张梦姣,尚晓娟,赵岁春

DOI: 10.13289/j.issn.1009-6264.2014.08.017

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