高張力鋼溶接熱影響部における粒界液化割れの機構(第 1 報)

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Mechanism of grain-boundary liquation cracking in weld heat-affected zone of HT100 (HY 130 type) high strength steel was studied using a high temperature microscope and an electron probe X-ray microanalyser. The main understandings are as follows : (1) For test high strength steel, low-melting point liquation of grain boundary was obviously observed at the temperature of about 1355℃∿1360℃ in rapid heating (heating rate about 270℃/sec.). This temperature was extremely lower than the solidus temperature (about 1440℃) in rapid heating. (2) In the heat-affected zone of the test high strength steel, there was formed some unetched "white-like grain boundary", so-called "heavy boundary" mainly due to Cr and Ni enrichments. The width of these boundaries becomes wider with an increasing peak temperature, and liquation was observed in these boundaries when heated to peak temperature over about 1360℃. (3) In "white-like grain boundaries" arrays of MnS particles were also observed frequently. By direct observation with a high temperature microscope, it was recognized that these precipitated MnS particles were formed during rapid cooling at the temperature below about 1000℃. (4) It was presumed that the most important factor to cause the grain-boundary liquation in the heat-affected zone of the test high strength steel was the low-melting point eutectic reaction between Cr and Ni elements which had been swept up and enriched to the grain boundary.
社団法人溶接学会の論文
1973-10-25

高張力鋼溶接熱影響部における粒界液化割れの機構(第 1 報)

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