退火参数对45^(#)钢微观组织和力学性能的影响  

Effect of annealing parameters on microstructure and mechanical properties of 45^(#)steel

作　　者：赵小龙[1] 罗晓阳[1] 王正仲 王生东[1] 贾智 ZHAO Xiao-long;LUO Xiao-yang;WANG Zheng-zhong;WANG Sheng-dong;JIA Zhi(Carbon Steel Sheet Plant,Jiu Steel Group Hongxing Iron&Steel Co.Ltd.,Jiayuguan 735100,China;School of Materials Science and Engineering,Lanzhou Univ.of Tech.,Lanzhou 730050,China;State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals,Lanzhou Univ.of Tech.,Lanzhou 730050,China)

机构地区：[1]酒钢集团宏兴钢铁股份有限公司碳钢薄板厂,甘肃嘉峪关735100 [2]兰州理工大学材料科学与工程学院,甘肃兰州730050 [3]兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,甘肃兰州730050

出　　处：《兰州理工大学学报》2024年第6期11-16,共6页Journal of Lanzhou University of Technology

基　　金：国家自然科学基金(52265049);甘肃省高等学校产业支撑计划(2022CYZC-26);甘肃省重点研发计划-工业类(23YFGA0054);甘肃省自然科学基金(23JRRA922)。

摘　　要：研究了45^(#)钢在不同退火温度和升温速度下的微观结构特征和力学性能演变.对不同参数退火后的试样进行了取向、晶界、晶粒类型、几何必须位错以及析出相分析,结合拉伸力学性能测试,说明了不同试样的力学性能变化.结果表明:45^(#)钢的微观组织结构和力学性能在不同的退火参数下具有较大的区别.随着退火温度的升高,45^(#)钢中的取向梯度、小角度晶界、变形晶粒、几何必须位错和渗碳体含量减小.退火加热速度对微观组织的影响是复杂的,在低温下,升温速度越慢,再结晶程度越大;但是在高温下相变参与了退火过程中静态再结晶形核和长大.在0.08℃/s-690℃退火参数下45^(#)钢的拉伸力学强度和韧性最佳,拉伸断口表现为塑性断裂模式.The microstructure characteristics and mechanical properties evolution of 45 steel under different annealing temperatures and heating rates were studied.The orientation,grain boundaries,grain types,geometrically necessary dislocations,and precipitates of samples with different annealing parameters were analyzed.Combined with tensile mechanical properties testing,the mechanical properties of different samples were explained.The results indicated that the microstructure and mechanical properties of 45 steel have significant differences under different annealing parameters.As the annealing temperature increases,the orientation gradient,low-angle grain boundaries,deformed grains,geometrically necessary dislocations,and cementite content of 45 steel decrease.The effect of annealing heating rate on microstructure is complex.At low temperatures,the slower the heating rate,the greater the degree of recrystallization.However,at high temperatures,the phase transition participates in the static recrystallization nucleation and growth during the annealing process.Under the annealing parameters of 0.08℃/s-690℃,the tensile mechanical strength and toughness of 45 steel are the best,with the tensile fracture surface exhibiting a plastic fracture mode.

关 键 词：45^(#)钢 退火参数 微观结构 力学性能 

分 类 号：TG161[金属学及工艺—热处理]