321型不銹鋼の組織とラプチャー強度の関係について

概要

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In austenitic stainless steels much ferrite precipitates by the adjustment of the chemical elements as austenite former and ferrite former. In this report, AISI 321 type stainless steels containing much ferrite or no ferrite were prepared, and the influence of ferrite in austenite on creep rupture strengh were detected. Moreover, 321 type stainless steels melted by conventional melting process (Ti/C≒2) or vacuum melting process (Ti/C≒8) were tested for confirming the influence of grain size and TiC changes obtained as the results of various heat treatmeuts on creep rupture strength. The results obtained by above mentioned experiments are as follows. 1) AISI 321 type stainless steel containing much ferrite shows lower creep rupture strength than no ferrite ones. 2) Creep rupture strength of 321 type stainless steels at 650℃ changes remarkably by heat treatments. 3) Creep rupture strength of specimens prepared by vacuum melting or conventional melting process shows same tendency corresponding with same heat treatment. 4) Grain size and TiC changes by heat treatments were supposed as the important factor for creep rupture strength, but the detail of their influence is studing from the various point of view. 5) The structural change and precipitated various compounds were detected with electron microscope and electronic diffraction.
社団法人日本材料学会の論文
1959-03-15