Austenite Grain Growth of Steel in Weld-Heat Affected Zone

概要

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In this report, a grain growth equation during thermal cycle, derived by the authors, was applied to the austenite grain growth during weld-thermal cycles in TIG arc and submerged arc welding of steel. And then austenite grain growth phenomenon in weld-heat affected zone was investigated. Main results obtained are as follows : 1) It was confirmed that austenite grain growth during weld thermal cycle could be calculated using the grain growth equation. 2) In weld thermal cycle, 60-80% of the total amount of grain growth occurs in heating cycle. 3) In cooling cycle, grain growth is nearly completed when temperature falls to the 90-95% of peak temperature. 4) During weld thermal cycle, grain growth rate increases rapidly as temperature rises, taking a maximum value just before the peak temperature and decreases rapidly as temperature falls.
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