张家银,陈学文,贾俊豪,杨帆,杜昱青

• 1:河南科技大学材料科学与工程学院

摘要(Abstract)：

为研究X12合金钢高温流变应力行为及其热变形过程中位错密度的演变规律,在温度为1050～1250℃、应变速率为0.005～5 s~(-1)、变形程度为50%的条件下,采用Gleeble-1500 D热模拟试验机对X12合金钢进行了热压缩实验,并采用XRD分析了该材料不同变形条件下位错密度。结果表明:X12合金钢在该实验温度及应变速率范围内有典型的动态再结晶特征。基于热压缩实验数据求出了X12合金钢的热变形激活能Q_(act)为531.095 kJ/mol,并构建了X12合金钢的Arrhenius高温流变应力模型,模型计算值与试验值吻合情况良好,平均相对误差为2.52%。不同变形条件下的X12合金钢总位错密度均在10~(14 )cm~(-2)以上,并且X12合金钢总的位错密度随应变速率增加而增加,随变形温度升高而减少。

关键词(KeyWords)： X12合金钢;流变应力模型;XRD试验;位错密度

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51575162)

作者(Author): 张家银,陈学文,贾俊豪,杨帆,杜昱青

DOI: 10.13289/j.issn.1009-6264.2019-0444

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