AISI 304,316 オーステナイト系ステンレス鋼溶接継手のクリープ破断性質

概要

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Some creep rupture properties at 600 and 700℃ of type AISI 304 and 316 austenitic stainless steels, 30mm in thickness, are discussed by comparing the test results between both welded specimens and observing the repture region of welded joints macro-and microscopically. The results are as follows : (1) A difference in the creep rupture strength of welded specimens between the type 304 and the type 316 steels is hardly observed at 600℃. In the case of test temperature 700℃, however, the creep rupture strength of weleded specimen of type 316 steel may tend to be lower than that of type 304 steel, as the rupture time becomes longer. (2) A crack, leading to a creep rupture, propagates preferentially in the region having fine carbides scattered in the austenite matrix adjacent to delta ferrite. Consequently, it has become clear that the creep rupture strength of welded joints of austenitic stainless steels is affected by the metallurgical change at high temperature in a long period, in the vicinity of the interface between the delta ferrite and the austenite in the weld metal.
社団法人溶接学会の論文
1972-05-25