潘权文,颜莹,李小武,王斌,张鹏,张哲峰

• 1:东北大学材料科学与工程学院材料物理与化学系
• 2:中国科学院金属研究所

摘要(Abstract)：

采用光学显微镜、透射电镜和拉伸实验等研究了不同热处理状态的双真空冶炼AISI 4340钢的显微组织与拉伸性能,并与普通冶炼AISI 4340钢的强度-塑性进行对比。结果表明:淬火态双真空冶炼AISI 4340钢的微观组织主要由板条和片层孪晶马氏体组成,板条内位错密度较高;经350℃回火后有大量碳化物析出,且仍观察到片层孪晶马氏体;随着回火温度继续升高,逐渐形成回火索氏体。随着回火温度升高,双真空冶炼AISI 4340钢中片层孪晶马氏体逐渐分解消失以及板条内位错密度下降导致其强度降低,而析出碳化物的球化则是塑性提高的主要原因。与普通冶炼工艺相比,双真空冶炼显著降低了AISI 4340钢中夹杂物含量,从而提高其塑性;淬火态和350℃回火态双真空冶炼AISI 4340钢强度-塑性同步提高的一个原因是纳米级片层孪晶马氏体的存在。

关键词(KeyWords)： AISI 4340钢;双真空冶炼;热处理;显微组织;拉伸性能

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金青年基金项目(52001310);; 中国博士后科学基金面上项目(2020M670810)

作者(Author): 潘权文,颜莹,李小武,王斌,张鹏,张哲峰

DOI: 10.13289/j.issn.1009-6264.2020-0497

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