铸造技术2025，Vol.46Issue(5)：439-447,9.DOI:10.16410/j.issn1000-8365.2025.5005
通过预变形奥氏体加速中锰钢贝氏体相变及其对力学性能的影响
Accelerated Bainite Transformation of Medium Manganese Steel by Austenite Predeformation and its Influence on Mechanical Properties
摘要
Abstract
The commonly used IA(intercritical annealing)and QP(quenching and partitioning)processes for medium manganese steel result in microstructures of austenite+martensite and austenite+ferrite.The former presents challenges in enhancing plasticity,whereas the latter struggles to improve yield strength,leading to a bottleneck in mechanical properties.To develop a new generation of medium manganese steel,it is essential to introduce new phase structures,among which bainitic transformation has garnered attention because of its favourable combination of strength and plasticity.However,the relatively high manganese content in medium manganese steel results in a relatively slow rate of bainitic transformation.Therefore,a method involving cold rolling of undercooled austenite prior to isothermal treatment was employed to introduce dislocations and accelerate the occurrence of bainitic transformation.Research findings indicate that after predeformation treatment,the bainitic microstructure appears 24 h earlier in deformed samples than in undeformed samples,with the transformation being nearly complete at 60 h,which is 12 h earlier than that in undeformed samples.In this experiment,dislocations do not hinder bainite growth;rather,the reduction in final bainite content is attributed to the significant promotion of pearlite nucleation and growth by dislocations.The extensive formation of pearlite consumes the nucleation sites at the grain boundaries,resulting in a decrease in the final transformation fraction of bainite from 40 vol.％to 18 vol.％.关键词
中锰钢/贝氏体相变/奥氏体预变形/冷轧Key words
medium Mn steel/bainitic transformation/austenite predeformation/cold rolling分类
金属材料引用本文复制引用
魏玄理,黄林科,刘峰..通过预变形奥氏体加速中锰钢贝氏体相变及其对力学性能的影响[J].铸造技术,2025,46(5):439-447,9.基金项目
国家自然科学基金(52271116,52130110,52431002) （52271116,52130110,52431002）
国家航空科学基金(2023Z053053003) （2023Z053053003）
凝固技术国家重点实验室研究基金(2024-TS-02) （2024-TS-02）
东北大学数字钢铁全国重点实验室开放课题基金(2022RALKFKT002) （2022RALKFKT002）
