Effect of Chromium and Molybdenum on Reheat Cracking Sensitivity of Steels : Study of Reheat Cracking of Cr-Mo Steels, Report 2

概要

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Effects of chromium and molybdenum on the reheat cracking sensitlty of high strength steels and heat resisting steels were investigated using 20 synthetic Cr-Mo steel specimens prepared in authors' laboratory. These specimens contained 0 to 5% Cr and 0.25 to 1.5% Mo and 0.02% P. The cracking sensitivity was evaluated in terms of the critical restraint stress,σAW-crit obtained by a modified implant test method. The results are summarized as follows. (1) When the chromium content was smaller than about 1%, the cracking sensitivity increased with an increase of chromium content but when it exceeded about 1%, the sensitivity decreased. (2) Molybdenum increased the cracking sensitivity. Its effect became maximum when the chromiurn content was about 1%. (3) A remarkable combined effect was recognized between chromium and molybdenum. Such combined effect was expressed by means of the contour lines ofσAW-crit shown in the Cr-Mo contents diagram.
社団法人溶接学会の論文
1983-10-01