闫永明,刘雅政,徐盛,李俊儒

• 1:北京科技大学材料科学与工程学院

摘要(Abstract)：

利用Gleeble-1500热模拟机进行热拉伸实验,研究了变形温度800~1200℃和应变速率0.002~20 s-1范围内23CrNi3Mo钢热塑性行为及断裂机理。结果表明:23CrNi3Mo钢具有优异的高温塑性。不同的变形温度下,峰值应力随温度线性降低,而随应变速率的增加峰值应力升高。应变速率2 s-1时,热拉伸过程中,高温断裂机制为韧性断裂,断口呈韧窝形貌。随着温度的升高,韧窝直径变小而深度增加。变形温度1050℃时,随应变速率的降低,断裂机制由韧性断裂转变为脆性断裂。应变速率高于0.2 s-1时,断口呈韧窝形貌;而应变速率低于0.2 s-1时,断口呈沿晶断裂形貌。高温拉伸断裂过程中,夹杂物的存在对裂纹的萌生与扩展有一定的影响作用。

关键词(KeyWords)： 热塑性;变形温度;应变速度;断裂机理;夹杂物

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 闫永明,刘雅政,徐盛,李俊儒

DOI: 10.13289/j.issn.1009-6264.2014.06.015

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