12Mn钢圆坯的高温力学性能

High-temperature Mechanical Properties of 12Mn Steel Round Billet

采用Gleeble-1500D热/力模拟试验机,测试了12 Mn钢圆坯的高温力学性能,获得600～1 300℃范围内铸坯的抗拉强度、断面收缩率以及应力-应变曲线。结果表明,12 Mn钢圆坯的抗拉强度较好,650℃时其值为275 MPa,抗拉强度随温度的升高而降低;圆坯第Ⅲ脆性区较宽,温度范围为600～1 000℃,在其温度范围内断面收缩率小于60%;12 Mn圆坯在不同温度下的应力随应变先升高后降低,最后趋于水平。最后采用Thermal-cal软件对第Ⅲ脆性区析出相进行了验证。

The high-temperature mechanical properties of 12Mn steel round billet were tested by using a Gleeble-1500D thermal/force simulation tester. Tensile strength, the reduction of area (ψ) and stress-strain curve in the range of 600~1300℃. were obtained. The results show that of 12 Mn steel round billet has high strength. The tensile strength at 650℃ is 275 MPa,and it decreases with increasing temperature. The third brittleness temperature zone of the round billet is wide with temperature range at 600~750℃,and the reduction of area (ψ) in the temperature range is less than 60%. The stress of the 12Mn round billet at different temperatures increases firstly with the strain and then decreases, and finally tends to be stable. Finally ,the precipitation phase of the III brittle zone was verified by Thermal-cal software.