高温高应变率下异种不锈钢激光焊接件的力学性能

Mechanical properties of laser-welded dissimilar stainless steels structure at elevated temperature and high strain rates

利用改进的SHTB实验设备,对316L和304不锈钢焊接结构的动态力学性能进行了实验。提出了一种适用于焊接结构件的新型的SHTB夹持装置,并在应变率约103s-1、温度为25～500℃的环境下获得了焊接结构件动态应力-应变曲线。研究表明:随应变率的升高,结构件的屈服强度和抗拉强度随应变率的增大而增大,随温度的升高而降低,温度对结构件塑性流动应力的影响更明显。

Static and dynamic mechanical properties of AISI304 and AISI316L dissimilar stainless steel laser welded joints were experimentally studied by MTS and an improved SHTB device.A new SHTB clamping method for the welded structure was established.The dynamic strain-stress curves were obtained at the strain rate around 10 3 s-1 and temperature 25-500 ℃.Results show that yield strength and tensile strength of the welded structure increase with the increase of strain rate and decreas with the increase of temperature.Temperature has more significant effect on the plastic flow stress than strain rate.