摘要
本实验研究了临界区退火温度对0.02C-7Mn钢拉伸过程中的多相组织演变及力学性能的影响。研究结果表明,随退火温度升高,实验钢的屈服强度和抗拉强度先降后升,而延伸率则先升后降。实验钢在600℃退火后,室温组织由残余奥氏体和退火马氏体双相组成;在620~700℃退火后,室温组织由残余奥氏体、α'-马氏体和ε-马氏体组成。随退火温度升高,实验钢在拉伸过程中分别出现了γ→α'、γ→ε和ε→α'相变。其中,γ→ε相变对延伸性能的影响最为显著,而ε→α'相变对加工硬化性能的影响最为显著。在620℃退火后,实验钢在拉伸过程中共发生了γ→α'、γ→ε和ε→α'三种相变,抗拉强度为776.5MPa,屈服强度为675.0MPa,延伸率为29.5%。
Effect of intercritical annealing temperature on multiphase microstructure evolution and mechanical properties of 0.02 C-7 Mn steel during tensile deformation was investigated.Results indicated that both tensile strength and yield strength decreased firstly and then increased with the increasing annealing temperature,while the total elongation had an opposite trend.After annealed at 600℃,the microstructure contained retained austenite and annealing martensite.When annealed between 620℃and 700℃,the microstructure consisted of retained austenite,α′-martensite andε-martensite.With the further increase of annealing temperature,theγ→α′,γ→εandε→α′transformations appeared successively.Theγ→εtransformation had the most significant effect on the total elongation,while theε→α′transformation was beneficial for working hardening properties.After annealed at 620℃,the existence ofγ→α′,γ→εandε→α′transformations led to excellent mechanical properties:tensile strength was 776.5 MPa,yield strength was 675.0 MPa and total elongation was 29.5%.
作者
梁小凯
刘岗
孙新军
杨跃标
王贺
LIANG Xiaokai;LIU Gang;SUN Xinjun;YANG Yuebiao;WANG He(Central Iron and Steel Research Institute,Beijing 100081,China;Collaborative Innovation Center of Steel Technology,University of Science and Technology Beijing,Beijing 100083,China;Shanghai Qinghe Machinery Co.,Ltd,Shanghai 201800,China)
出处
《材料科学与工程学报》
CAS
CSCD
北大核心
2022年第4期557-566,共10页
Journal of Materials Science and Engineering
基金
国家重点研发计划资助项目(2017YFB0305100)。
关键词
临界区退火温度
超低碳中锰钢
TRIP效应
机械稳定性
ε-马氏体
Intercritical annealing temperature
Ultra-low carbon medium manganese steel
TRIP effect
Mechanical stability
ε-martensite
