调质处理对22MnCrNiMo钢闪光焊焊缝组织与力学性能的影响

为研究调质处理对R4s （22MnCrNiMo）级系泊链钢闪光焊焊缝区力学性能的影响,通过改变循环淬火温度（880~960 ℃）,确定最优淬火温度;然后通过改变回火温度（560~640℃）和回火后保温时间（2040 min）,研究回火温度和回火后保温时间对钢力学性能的影响。结果表明,经调质处理后,焊缝区断口虽仍呈现韧性断裂,但拥有较高的强度和较好的塑性,特别是在920 ℃ 30 min+920 ℃ 30 min淬火+600℃30 min处理后,焊缝区拥有较高的强度和最佳的塑性,强度达到1 071 MPa,延伸率高达17%,综合性能最优。

Effect of Quenching and Tempering Treatment on Structure andMechanical Properties of 22MnCrNiMo Steel Flash Weld Zone

In order to study the effect of quenching and tempering treatment on the mechanical property of R4s (22MnCrNiMo) mooring chain steel flash weld zone, the double quenching is carried out at 880 ~ 960℃. to define optimum quenching temperature by changing the tempering temperature (560 ~ 640 °C), and the holding time 20 ~ 40 min, the effect of tempering temperature and holding time on the mechanical property of steel is studied. The results show that with quenching and tempering treatment, all the fracture surfaces in the weld area are ductile fracture with high strength and good plasticity. Especially after 920 °C 30 min + 920°C 30 min quenching + 600 °C 30 min tempering treatment, the weld zone of steel has higher strength and best plasticity, the strength of steel is 1 071 MPa, the elongation is 17%, and the comprehensive performance reaches the optimal.