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通过热模拟实验和盐浴淬火处理,研究了60Si2Mn钢盘条奥氏体化后在300℃等温盐浴淬火时的组织演变规律及相应的力学性能,结果表明:在300℃等温盐浴淬火,形成下贝氏体,相变孕育期约为100 s,相变完成时间约为3000 s。随等温时间延长,材料抗拉强度缓慢降低,而面缩率不断增加,等温3000 s后,材料抗拉强度保持在1800 MPa以上,面缩率可达到50%。组织分析结果显示,下贝氏体由针状铁素体和纳米级条状奥氏体组成,起到提高材料韧性的作用。
The microstructure evolution and mechanical properties of 60Si2Mn steel wire rod after austenitizing at 300 ℃ were investigated by means of thermal simulation and salt bath quenching. The results show that the microstructure of 60Si2Mn steel wire rod after quenching at 300 ℃ isothermal quenching, The formation of lower bainite, phase transition period of about 100 s, the completion time of transformation is about 3000 s. With the extension of isothermal time, the tensile strength of the material decreases slowly, while the reduction of surface area increases continuously. After the isothermal 3000 s, the tensile strength of the material remains above 1800 MPa and the reduction of surface area can reach 50%. Tissue analysis showed that the lower bainite composed of acicular ferrite and nanoscale austenite, play a role in improving the toughness of the material.