摘要
采用光学显微镜、透射电镜、拉伸试验、冲击试验等研究了不同温度淬回火对30CrMnSiA钢组织与力学性能的影响。结果表明:不同温度淬火的30CrMnSiA钢的组织为板条马氏体和残余奥氏体的混合组织。随着淬火温度的升高,30CrMnSiA钢的马氏体板条束逐渐变宽。880℃淬火的30CrMnSiA钢进行不同温度的回火,随着回火温度的升高,30CrMnSiA钢中析出碳化物不断增多,640℃回火的30CrMnSiA钢中碳化物大量聚集呈带状分布。随着回火温度的升高,30CrMnSiA钢的强度逐渐下降,伸长率、冲击吸收能量逐渐升高。880℃淬火+520℃回火的30CrMnSiA钢的抗拉强度、屈服强度、伸长率和冲击吸收能量分别为1098 MPa、985 MPa、11.3%和181 J,满足钢结构紧固件材料10.9S性能等级要求。
The effects of quenching and tempering at different temperatures on the microstructure and mechanical properties of 30CrMnSiA steel were studied by optical microscope, transmission electron microscope, tensile test and impact test. The results show that the microstructure of 30CrMnSiA steel quenched at different temperatures is a mixture of lat martensite and retained austenite. With the increase of quenching temperature, the martensitic strip bundle of 30CrMnSiA steel gradually widens. 30CrMnSiA steel quenched at 880℃ is tempered at different temperatures. With the increase of tempering temperature, the carbide precipitates in 30CrMnSiA steel increase, and the carbide aggregates in 30CrMnSiA steel tempered at 640 ℃ which are in banded. With the increase of tempering temperature, the strength of 30CrMnSiA steel decreases gradually, while the elongation and energy absorbed by impact increase gradually. The tensile strength, yield strength, elongation and shock absorption energy of 30CrMnSiA steel quenched at 880 ℃ and tempered at 520 ℃ are 1098MPa, 985 MPa, 11.3% and 181 J, respectively, which can meet the performance grade requirements of steel structure fastener materials at 10.9S.
作者
齐加胜
QI Jiasheng(Nanjing Science and Technology Zijin College,University,Nanjing 210046,China)
出处
《热加工工艺》
北大核心
2022年第24期125-128,共4页
Hot Working Technology
基金
江苏省高等学校自然科学研究面上项目(18KJB460018)。
