インプラント試験による鋼の低温割れの限界応力と残留水素濃度の関係

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There are few studies on relationship between critical stress and residual diffusible hydrogen content H_R when the temperature on bond line becomes the crack initiating temperature. It seems that residual hydrogen content H_R relates with critical stress of HAZ cracking more closely than initial hydrogen content H_<IIW>, H_<JIS>. This paper describes relationship between critical stress and residual hydrogen content at temperature 100℃ on bond line. Residual hydrogen content H_R is measured by means of mercury method and experimental equations between H_R and thermal factor ΣDΔt which relates with thermal cycle on bond line are deduced. Conventional equation of thermal factor ΣDΔt is deduced from 100 data on thermal cycles by use of regression analysis. Implant tests are carried out under various conditions of initial hydrogen content H_0. It is shown that critical stress is approximately obtained from residual hydrogen content H_R at temperature 100℃ on bond line under various initial hydrogen contents. The conclusions obtained in this report are summarized as follows : 1. Experimental equation between thermal factor ΣDΔt and ratio of hydrogen content H_R to initial hydrogen content H_0 is deduced. [numerical formula] [numerical formula] 2. Thermal factor ΣDΔt)_<100> at cooling temperature 100℃ on bond line is given by following equation; [numerical formula] where tθ=cooling time from 1500℃ to θ(℃) on bond line, sec 3. Critical net stress of implant test is considered to be a function of residual hydrogen content [numerical formula].
社団法人溶接学会の論文
1979-04-05

インプラント試験による鋼の低温割れの限界応力と残留水素濃度の関係

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