Combined Influence of Chromium, Molybdenum and Vanadium on Reheat Cracking of Steel : Study of Reheat Cracking of Cr-Mo Steels, (Report 9)

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The influence of vanadium on the reheat cracking sensitivity was examined on various Cr-Mo steels and the experimental results were discussed from the viewpoint of the combined influence of chromium, molybdenum and vanadium. Steel specimens were prepared in the laboratory; their chemical composition ranged from zero to 2.0% Cr, 0.28 to 0.8% Mo and 0 to 0.4% V. The cracking test was performed by using an implant test machine of the constant-strain type. The cracking sensitivity of each steel was compared in terms of critical restraint stress to produce reheat cracking. The contour lines of the critical restraint stress were drawn in the Cr-Mo contents diagram and the shift in these lines brought about by the addition of vanadium was indicated. The influence of vanadium differs largely depending on each set of Cr-Mo contents. The groups of 0% Cr-Mo steels and Cr-0.28% Mo steels are originally insensitive to cracking. They become very sensitive by vanadium of a small quantity such as 0.1%. On the contrary, the groups of Cr-05.% Mo and Cr-0.8% Mo steels, which are originally sensitive to cracking, are affected a litlle by vanadium. The critical restraint stress is a function of two factors, the stress relaxation and the fracture strength. The decrease of critical restraint stress (the increase of cracking sensitivity is mainly brought about by the decrease of stress relaxation. Vanadium affects little the original value of fracture strength of Cr-Mo steels.
社団法人溶接学会の論文
1993-10-01

Combined Influence of Chromium, Molybdenum and Vanadium on Reheat Cracking of Steel : Study of Reheat Cracking of Cr-Mo Steels, (Report 9)

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