Influence of Vanadium Carbide on Reheat Cracking of Cr-Mo Steels : Study of Reheat Cracking of Cr-Mo Steels (Report 10)

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The authors have pointed out in the previous paper that vanadium increased the sensitivity to reheat cracking of Cr-Mo steels by playing the role of decreasing the stress relaxation. This effect of vanadium may be related to the secondary hardening caused by vanadium carbide. In this paper, the cracking sensitivity of Cr-Mo-V steels is discussed from the viewpoint of the precipitation of vanadium carbide and other carbide phases. X-ray analysis was carried out on the carbide phases extracted electrolytically from the simulated-HAZ specimens tempered at 973K. Following experimental results were obtained on the sleels of the chemical composition ranges of 0 to 2% Cr, 0.28 to 0.8% Mo and 0 to 0.4% V. (1) The increase of cracking sensitivity brought about by the addition of vanadium corresponds closely to the increase of hardness induced by the secondary hardening. (2) Cr-0.28% Mo steels are originally less sensitive to cracking. Addition of vanadium converts these steels into secondary-hardenable, and hence, cracking-sensitive type. (3) Cr-0.8% Mo steels are originally secondary-hardenable type, and are sensitive to reheat cracking. The secondary hardening in this case is induced by the precipitation of molybdenum carbide. The cracking sensitivity of these steels is affected a little by vanadium. This result is explained by the fact that the ability of increasing hardness is almost the sarne for vanadium carbide and for molybdenum carbide.
社団法人溶接学会の論文
1993-10-01

Influence of Vanadium Carbide on Reheat Cracking of Cr-Mo Steels : Study of Reheat Cracking of Cr-Mo Steels (Report 10)

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