王坤,张莉芹,刘中柱,刘文斌,李方中,胡锋

• 1:武汉科技大学高性能钢铁材料及其应用省部共建协同创新中心
• 2:武汉科技大学应用物理系
• 3:中信金属宁波能源有限公司
• 4:宝武集团鄂城钢铁有限公司

摘要(Abstract)：

利用扫描电镜、电子背散射衍射、透射电镜及VASP第一性原理模拟等方法研究了氮含量对微合金化压力容器钢组织转变及力学性能的影响。结果表明:当氮含量从60×10~(-6)增加至93×10~(-6)时,试验钢中的铁素体体积分数变化较小,珠光体占比从5.8 vol%增加至18.4 vol%,粒状贝氏体组织从49.4 vol%减少为28.0 vol%;当氮含量增加至150×10~(-6)时,试验钢组织由47.6 vol%的珠光体与52.4 vol%的铁素体组成。氮含量增加使试验钢在强度变化较小的基础上,-40℃低温冲击吸收能量和伸长率提升,这主要是因为高氮(150×10~(-6))试验钢中析出更多的氮化物颗粒,增加了相变过程中的形核位置,有效促进了珠光体转变;热轧后的低氮(60×10~(-6))试验钢在正火后由于奥氏体中C的过饱和度增加,较高温度下连续冷却发生了贝氏体转变,形成粒状贝氏体组织,恶化了试验钢的塑韧性。

关键词(KeyWords)： 正火型压力容器钢;氮含量;微合金化;珠光体转变;粒状贝氏体

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(U20A20279);; 武汉市科技计划(2019010701011382);; 高等学校学科创新引智计划资助项目(111计划);; 中信-CBMM铌钢科技研发项目(2020-M1119)

作者(Author): 王坤,张莉芹,刘中柱,刘文斌,李方中,胡锋

DOI: 10.13289/j.issn.1009-6264.2021-0214

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