万德成,蔡庆伍,余伟,董长征

• 1:北京科技大学冶金工程研究院

摘要(Abstract)：

观察并研究了250～600℃区间回火对超高强贝氏体钢组织与力学性能的影响。结果表明:随回火温度升高,抗拉强度不断降低,屈服强度先升高后降低,伸长率和冲击功则呈先升高后降低然后再升高变化规律。250～350℃回火,残留奥氏体分解速率缓慢,抑制了板条合并粗化,组织为板条贝氏体+稳定膜状残留奥氏体,析出相粒子尺寸细小,具有良好的强度和塑韧性。特别是在350℃回火时,板条内部有ε碳化物析出,以及位错移动所形成的位错胞状亚结构细化了晶粒,使其具有最佳强韧配合。450℃回火,残留奥氏体大量分解导致组织内部出现链状分布的渗碳体,引起回火脆性。600℃回火,残留奥氏体几乎全部分解,部分区域发生再结晶,塑性和韧性提高而强度明显降低,析出物明显粗化。力学性能的非单调变化归因于钢在回火过程中,既包括板条贝氏体和位错亚结构的回复、再结晶软化过程,也包括残留奥氏体分解与析出相的强化机制。

关键词(KeyWords)： 超高强钢;贝氏体;回火;组织;力学性能

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 万德成,蔡庆伍,余伟,董长征

DOI: 10.13289/j.issn.1009-6264.2013.05.028

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