插销试件合理缺口深度的探讨
AN INQUIRY OF THE RATIONAL NOTCH DEPTH OF THE IMPLANT TEST SPECIMEN
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摘要: 本文对C.L.M.Cottrell,F.Watkinson等采用带环形缺口试件。在充氢高压釜中做拉伸试验,用以确定钢材氢脆敏感性的研究结果进行了分析,指出了IIW推荐的插销试件缺口型式的不足之处。并对正火、热模拟和焊后状态的15MnVN钢进行了不同缺口深度对钢材缺口拉伸强度影响的试验,提出用由氢引起的缺口强度降低的程度,来表示钢材对氢致裂纹的敏感性,并以D值表示:D=(σNT-σImpcr)/(σNT)×100%最后叙述了D值的应用实例,用D值比较了两种后热工艺,为某压力容器的焊接,选择了防止氢致裂纹的后热工艺。Abstract: The present report summarized the work on the susceptibility to hydrogen embri-ttlement of steel by C.L.M.Cottrol,F.Watkinson and et cetera,utilizing roundnotched tensile test specimens in a chamber filled with high pressure hydrogen.The specific type of Implant test specimen as recommended by ⅢW(round specimen,8mm diam.,40°deg.notch,<0.1mm root radius,0.5mm notch depth) was analyzed and its shortcomings cited.The influence of notch depth on notched tensile strength of steel 15MnVN in the normalized,thermal simulated and welded state was investigated.The authors present in this paper an expression D for the susceptibility of steel to hydrogen induced cracking,as indicated by the difference in reduction of notched tensile strength caused by hydrogen i.e.,D=(σNT-σImpcr)/(σNT)·100%.The authors give also an example of taking the D value as criterion to compare two different postheat procedures and choose the one suitable for making certain welded pressure vessels free from hydrogen induced cracking.
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