摘要
利用扫描电镜、电子背散射衍射分析技术和拉伸试验机研究了具有伪共析初始组织的45钢温轧后不同退火保温时间对组织演变和力学性能的影响。结果表明,伪共析钢温轧后的组织呈多相多尺度分布,渗碳体破碎,在后续退火处理中,随着退火时间的增加,渗碳体逐渐球化、长大并且分布趋于均匀,多相多尺度结构弱化。退火时间从15 min延长至120 min后,铁素体晶粒平均尺寸由2. 32μm长大到5. 62μm,规定塑性延伸强度由温轧态的1057 MPa下降到662 MPa,均匀伸长率在退火120 min时最大。整体来说,试验钢经过500℃温轧后再经600℃退火15 min,综合力学性能达到最优。
Effect of annealing time on the microstructure evolution and mechanical properties of warm rolled 45 steel with pseudoeutectoid type initial microstructure was studied by means of scanning electron microscopy,electron backscatter diffraction and tensile test. The results show that the microstructure of the warm rolled steel is of multiphase and multiscale,and the cementite is fragmented. With the increase of annealing time,the cementite gradually spheroidizes,grows up and gradually distributes evenly,and the multiphase and multiscale structure is weakened. With the annealing time increases from 15 min to 120 min,the average ferrite grain size increases from 2. 32 μm to 5. 62 μm,the proof strength,plastic extension decreases from 1057 MPa to 662 MPa,and the uniform elongation reaches the maximum when annealed at 120 min. Overall,the comprehensive mechanical properties of the tested steel reaches the best when warm rolled at 500 ℃,then annealed at 600 ℃ for 15 min.
作者
张馨月
杨明维
冯运莉
曹阔
李杰
Zhang Xinyue;Yang Mingwei;Feng Yunli;Cao Kuo;Li Jie(College of Metallurgy and Energy,North China University of Science and Technology,Tangshan Hebei 063210,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2020年第4期132-136,共5页
Heat Treatment of Metals
基金
国家自然科学基金(51674123)
河北省自然科学基金(E2017209237)。
关键词
伪共析45钢
温轧
退火
组织演变
力学性能
pseudoeutectoid 45 steel
warm rolling
annealing
microstructure evolution
mechanical properties
