Effect of Vanadium and Titanium on Reheat Cracking Sensitivity : Study of Reheat Cracking of Cr-Mo Steels, Report 4

概要

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Influences of vanadium and titanium on the reheat cracking sensitivity of Cr-Mo steels were investigated using 13 synthetic 0.06% V-bearing and 9 synthetic 0.07% Ti-bearing Cr-Mo steels, which contained 0 to 2% Cr and 0.25 to 0.8%Mo. Cracking sensitivity was evaluated in terms of the critical restraint stress, σAW_crit, obtained by the implant type reheat cracking test. The results are summarized as follows. (1) 0.06% V addition increases the cracking sensitivity especially in the content region of low molybdenum. (2) 0.07% Ti addition increases the cracking sensitivity especially in the content region of low chromium and high molybdenum. (3) Two important factors which dominate the critical restraint stress are the stress relaxation. R and the grain boundary strength at the time of crack initiation,σPW_crit. Vanadium and titanium remarkably decrease R but they hardly decreaseσPW_crit. (4) The decrease of the stress relaxation, ΔR, was mainly associated with the strengthening of matrix which was brought about by the precipitation of V_4C_3 or TiC during reheating.
社団法人溶接学会の論文
1984-04-01