Study on the Behaviour of Grain Boundary at Heat-Affected Zone of SUS 347 and SUS 321 Austenitic Stainless Steels
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概要
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In this report, some experiments on SUS 347 and SUS 321 stabilized austenitic stainless steels were conducted with a high temperature microscope and an electron probe X-ray microanalyser to obtain a more detailed understanding of grain-boundary liquation cracking in the weld heat-affected zone. The main results obtained in this study are as follows : 1) In SUS 347 stainless steel, the appearance of liquid phase occurred at the temperature lower by about 70℃ than the solidus in both cases of rapid and slow heating. This phenomenon is probably attributed to eutectic reaction between niobium carbide and γ-iron. 2) Grain-boundary liquation was observed in the heat-affected zone of SUS 347 stainless steel. The mechanism causing grain-boundary liquation is presumed to be as follows : Grain-boundary migration attendant on rapid heating occurs and these migrating grain boundaries are pinned by niobium precipitates which remain indissolved in spite of heating at high temperature above 1300℃. Subsequently, with an increasing temperature NbC-γ-iron eutectic reaction occurs and then the eutectic liquid produced in close vicinity of niobium precipitates penetrates into the grain boundaries which have been pinned and fixed there. 3) Narrow ferrites extended in the rolling direction existing in the base metal were liable to promote liquation hot cracking in HAZ. 4) It is presumed that SUS 321 stabilized steel has less tendency to grain-boundary liquation than SUS 347 stabilized steel and then has less susceptibility to hot cracking in HAZ.
- 社団法人溶接学会の論文
著者
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Tamura Hiroshi
Tokyo Institute Of Technology
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Watanabe Takehiko
Tokyo Institute Of Technolngy
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Tamura Hiroshi
Tokyo Institute Of Technolngy
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