極低温用 40% Ni 系溶接金属に関する研究(第 1 報) : 高温割れにおよぼす化学成分の影響

概要

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In this report, an investigation was carried out to determine the effect of chemical composition on the hot crack sensitivity of 40% Ni-6% Mn-10% Cr type weld metal for welding 9% Ni steel. The hot crack occurred in 40% Ni type weld metal can be classified as solidification cracking. Experimental results on coated electrodes are summarized as follows : Sulfur and silicon were found to have a highly detrimental effect when the sulfur content was increased from 0.01% to 0.02% and the silicon content was raised from 0.2% to 0.8%. Phosphorus was found to have a detrimental effect similar to, but not as severe as, that of sulfur when the phosphorus content was raised from 0.01% to 0.02%. According to the test results on experimental MIG wires which phosphorus contents were kept at low level, the occurrence of hot crack in weld beads proper was highly dependent on the contents of sulfur and silicon. Molybdenum had beneficial effect on the hot cracking sensitivity when its content was increased from 2% to 9%. Therefore, it is possible to add molybdenum as the alloying element for strengthening 40% Ni type weld metal. It can be considered that the harmful effect of silicon and sulfur was attributed to a high degree of microsegregation which was confirmed, using ion microprobe massanalyzer, on the longitudinal fractured surface in the center of weld metal.
社団法人溶接学会の論文
1979-08-05