杜瑜宾,胡小锋,宋元元,姜海昌,戎利建

• 1:中国科学院金属研究所中国科学院核用材料与安全评价重点实验室
• 2:中国科学技术大学材料科学与工程学院

摘要(Abstract)：

利用原子探针层析技术(APT)对含1.4 mass%Cu的低合金高强度钢(High strength low alloy, HSLA)在450℃回火2～100 h后的富Cu团簇进行了表征,并对富Cu团簇的粗化行为及其强化行为进行了定量分析,通过拉伸实验测定了实验钢的力学性能。APT结果表明:随着回火时间的延长,富Cu团簇的等效半径逐渐增加、数量密度逐渐降低。富Cu团簇的粗化系数k,由回火2～10 h的1.9 nm~3/h,减小为50～100 h时的0.27 nm~3/h,导致富Cu团簇粗化速率下降。回火过程中,析出的富Cu团簇通过与位错的交互作用,显著提高了1.4Cu钢的屈服强度,回火2～10 h时后实验钢出现了一个屈服强度约为1076 MPa和伸长率约为19%的平台,表明实验钢具有良好的强塑性匹配。

关键词(KeyWords)： HSLA钢;回火时间;富Cu团簇;粗化行为;强塑性

Abstract:

Keywords:

基金项目(Foundation): 国家重点研发计划(2016YFB0300601);; 辽宁省“兴辽英才计划”项目(LYC1907143);; 中国科学院战略重点研究项目(XDC04000000);; 辽宁省自然科学基金(2020-MS-008)

作者(Author): 杜瑜宾,胡小锋,宋元元,姜海昌,戎利建

DOI: 10.13289/j.issn.1009-6264.2021-0159

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