フェライト系高 Cr 鋼板と溶接部のσぜい性および 475℃ぜい性

概要

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Sigma embrittlement was studied on two different high chromium steel plates (both 25%Cr and 24%Cr+1.5%Si+1.5%Al alloy steel) and four different weld metals deposited with 24∿27%Cr+0.5∿1.5%Si electrode. In the first place, these materials were aged to form sigma phase at 700℃ for 100∿1000 hours. After aging at 700℃, Charpy impact tests and tensile tests were conducted with these embrittled materials. In addition to the above experiment, Authors investigated on 475℃ embrittlement in the case of 24%Cr+1.5%Si+1.5%Al steel plates and weld metals deposited with 28%Cr+1.5%Si electrode. The results of investigation concerning mechanical properties of embrittled parts were as follows : 1. 475℃ embrittlement and sigma formation occurred more rapidly in weld metals than in steel plates, and tendency to embrittlement of all test materials was more intensive in the case of 475℃ embrittlement than in sigma formation. 2. Sigma embrittlement was, as a rule, removed by normalizing at about 800℃.
社団法人溶接学会の論文
1963-09-25