冷却速度对奥氏体不锈钢焊缝低温A_(kV2)的影响

Influence of Cooling Speed on Low Temperature A_(kV2) of Austenitici Stainless Steel Weld

为了进一步优化移动式压力容器用奥氏体不锈钢焊缝低温冲击韧性,通过对奥氏体不锈钢焊缝采用空冷、气冷、铜冷的冷却方式,对3种冷却方式的焊缝进行了拉伸及-196℃低温冲击试验对比分析,并对其焊缝组织进行了观察分析,发现奥氏体不锈钢焊缝的组织中铁素体均匀分布于柱状晶两侧,因此其具有较高的抗拉强度。试验结果得出,铜冷方式冷却焊缝速度最快,从900℃到400℃降温时间为36 s,组织奥氏体化程度最高,焊缝-196℃低温冲击韧性值最优,为24.67 J。

In order to optimize the cryogenic impact toughness of austenitic stainless steel weld for mobile pressure vessels, air cooling, gas cooling and copper cooling were taken for attstenitie stainless steel weld, the resuhs of tensile lesl and -196℃ low-lemperature impact test with the three cooling methods were analyzed anti compared, the weht mierostruture was observed and compared. The analyses showed that. fen＇ite was uniformly distrihuted on two sides of columnar crystal, so it has high tensile strength. The results indicated that the fastest cooling rate w＇as by copper cooling, it took 36 s to cool form 900℃, to 400 ℃. and the cryogenic impact toughness of weld at -196 ℃ had optimal value 24.67 J.