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本文采用高压釜充氢试验方法(充氢条件为;高压氢,450℃,48 h)研究了各种氢暴露条件和冷却循环对奥氏体不锈钢堆焊部位的氢致剥离敏感性的影响。所用试样是在2 1/4Cr-1Mc厚锻造板上用三种带极和焊接工艺堆焊而成。结果表明,(1)剥离是试样暴露在高温高压氢气中之后,冷却至室温放置过程中而产生的延迟裂纹;(2)剥离是沿着靠近境界层的粗大晶界或碳化物层的晶间断裂;(3)增加充氢氢分压,或增加充氢后的冷却速度,剥离敏感性增加;(4)本工作为奥氏体不锈钢堆焊部位氢致剥离裂纹的研究提供了有效的手段,同时为我国热壁加氢反应器堆焊材料和工艺的选择及其制定安全操作规程提供了指导原则。
In this paper, the effects of various hydrogen exposure conditions and cooling cycles on the hydrogen-induced peel susceptibility of the welded parts of austenitic stainless steel were studied by autoclave hydrogen charging (hydrogen charging conditions: high pressure hydrogen, 450 ℃, 48 h). The sample used is a 2 1 / 4Cr-1Mc thick forging plate with three with welding and welding process. The results are as follows: (1) Peeling is the delayed crack caused when the sample is exposed to high temperature and high pressure hydrogen and cooled to room temperature. (2) Peeling is along the coarse grain boundaries near the boundary layer or the crystal of the carbide layer (4) This work provides an effective method for the study of hydrogen-induced peel cracking in the welding area of austenitic stainless steel. (3) Means at the same time for the hot wall hydrogenation reactor surfacing materials and process selection and the development of safe operating procedures provide guidance.