万德成,蔡庆伍,李红斌

• 1:华北理工大学河北省现代冶金技术重点实验室
• 2:北京科技大学冶金工程研究院

摘要(Abstract)：

采用热轧后间断淬火+回火(IDQ+T)和在线配分(DQP)两种不同的工艺对Si-Mn-Cr-Ni-Mo系中碳低合金钢进行处理,利用SEM、XRD、EBSD研究冷却工艺对微观组织和力学性能的影响。结果表明:两种工艺下均得到板条马氏体和残留奥氏体的组织。经过轧后间断淬火+回火(IDQ+T),随淬火终冷温度升高,马氏体板条粗化,碳化物尺寸增加,残留奥氏体含量增加,强度降低,伸长率升高,韧性先升高后降低。组织中的粗大马氏体板条和尺寸较大的碳化物会降低韧性。在线配分(DQP)工艺得到的残留奥氏体含量最高,分布也更均匀,因此其伸长率和冲击功均明显增加,但残留奥氏体量增加同时会降低钢的强度,对屈服强度的影响最明显,导致屈强比降低。DQP处理实验钢的综合力学更优,抗拉强度超过1500 MPa、屈服强度超过1000 MPa,伸长率大于16%,-20℃冲击功达到26.8 J。

关键词(KeyWords)： Si-Mn-Cr-Ni-Mo系超高强钢;冷却工艺;残留奥氏体;力学性能

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 万德成,蔡庆伍,李红斌

DOI: 10.13289/j.issn.1009-6264.2015.08.029

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