摘要
采用双相区保温淬火(I&Q)和双相区保温+奥氏体化淬火(I&P&Q)工艺和直接淬火(DQ)工艺,结合热力学计算,研究了低碳硅锰钢热处理过程中Mn配分行为及其对组织演变和力学性能的影响机制。结果表明:经I&Q工艺处理,Mn在室温马氏体中出现了明显富集,马氏体以条状、块状、团状三种形态分布,化学位梯度驱使着Mn由铁素体向奥氏体中配分,Mn在晶界处的配分行为影响着晶界的迁移方向,使得形成不同形态的奥氏体晶粒;I&P&Q工艺处理后Mn在马氏体中呈不均匀分布,较DQ工艺,I&P&Q工艺使钢的伸长率由5.2%提高到10.9%,强塑积提高了6812 MPa·%。
In combination with thermodynamic calculation, the Mn partitioning behavior and its effect on microstructure and properties of low carbon Si-Mn steel in I＆P＆Q process were studied by means of intercritical annealing, then quenching （I＆Q） and intercritical annealing, subsequent austenitizing and quenching （I＆P＆Q） plus directly quenching （DQ） processes. The results show that after treated by I＆Q process, Mn enriches in the martensite obviously, and martensite is identified as morphologies of streaky, nodular and massive. Mn is driven to partition from ferrite to austenite by chemical potential gradient, Mn partitioning behavior along grain boundary has influenced the direction of grain boundary migration, results in various morphologies of austenite. After I＆P＆Q process, Mn emerges inhomogenerous distribution in martensite, and the enlongation is increased from 5.2% to 10.9%, the product of strength and elongation is increased by 6812 MPa · % as well than that of DQ process.
出处
《金属热处理》
CAS
CSCD
北大核心
2016年第4期110-114,共5页
Heat Treatment of Metals
基金
国家自然科学基金(51574107)
河北省自然科学基金(E2016209048)
河北省高校科学技术研究项目(QN2016185)
唐山市科技创新团队培养计划项目(15130202C)
关键词
低碳硅锰钢
Mn配分
组织演变
力学性能
low carbon Si-Mn steel
Mn partitioning
microstructural evolution
mechanical property
