崔岩,王瑾,张贵杰

• 1:河北联合大学冶金与能源学院

摘要(Abstract)：

实验研究了固溶C和预变形量对超低碳烘烤硬化(ULC-BH)钢的应变时效行为的影响。结果表明:ULC-BH钢在170℃×500 min的长时间烘烤过程中,C原子只发生了位错偏聚,并未出现有些文献报道的碳化物析出现象;在长时间时效处理以后,柯氏气团将达到饱和;当时效时间一定时,固溶C含量与烘烤硬化(BH)值均呈线性关系;当柯氏气团达到饱和时,固溶C质量分数为3.3×10-3%的试样的BH值达到72 MPa,远高于一些文献报道的30 MPa,表明"柯氏气团达到饱和时BH值最大达到30 MPa"的结论并不具有普遍性;位错密度越高,C原子偏聚到位错的扩散距离越短,所以柯氏气团的饱和速度越快;位错密度越高,当柯氏气团达到饱和以后,BH值越小。

关键词(KeyWords)： ULC-BH钢;应变时效;BH值;固溶C;位错密度

Abstract:

Keywords:

基金项目(Foundation): 河北联合大学培养基金(SP201304)

作者(Author): 崔岩,王瑾,张贵杰

DOI: 10.13289/j.issn.1009-6264.2015.04.025

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