摘要
对一种含Cu低碳硅锰钢分别采用I&Q、Q&P和I&Q&P热处理工艺,研究双相区Cu配分行为并分析其对马氏体组织形貌、残留奥氏体及力学性能的影响。结果表明,试验钢经I&Q工艺处理,在双相区保温时Cu元素从铁素体向奥氏体中配分,Cu配分明显,并且不影响C和Mn的配分效果。试验钢经I&Q&P工艺处理后,组织基本为板条马氏体,且马氏体板条清晰,部分板条有断裂的现象。与经Q&P工艺处理相比,试验钢经I&Q&P工艺处理后残留奥氏体体积分数显著提高,从9.6%提高到了13.2%。对比Q&P工艺,试验钢经I&Q&P工艺处理后,抗拉强度有一定降低,但伸长率大大提高,强塑积达到27 GPa·%。
A low carbon steel containing Cu was treated by I＆Q, Q＆P and I＆Q＆P process, Cu partitioning behavior and its effect on microslrueture and mechanical properties were studied. The resuhs show that when intercritical annealed at 780℃, Cu is partitioned from ferrite Io austenite. Microstructure of the steel treated by I＆Q＆P proeess is composed of lath martensite, and the marlensite lath is clear. Compared with that treated by Q＆P process, the steel treated by I＆Q＆P process has lower tensile strength, but higher ehmgation, and the product of strength and elongation improves to 27 GPa · %. The volume fraction of retained autensite increases from 9.6% to 13.2%. Theretore, the cnntent of retained austenite can be improved significantly by Cu partitioning, so the elongation of steel increases.
出处
《金属热处理》
CAS
CSCD
北大核心
2016年第8期76-80,共5页
Heat Treatment of Metals
基金
国家自然科学基金项目(51574107)
河北省自然科学基金项目(E2016209048)
河北省教育厅科研项目(QN2016185)
唐山市科技创新团队培养计划项目(15130202C)
关键词
低碳钢
Cu配分
I&Q&P工艺
显微组织
力学性能
low-carbon steel
Cu pariitioning behavior
I＆Q＆P process
microstrueture
mechanical properties
