高速度鋼における結晶粒の異常成長現象と結晶粒の微細化処理について

概要

論文の詳細を見る
A discontinuous austenite grain coarsing phenomenon of double hardened high speed tool steel and the procedure to control the grain gtowth on the second hardening have been studied under various heat treatment conditions. It is found that the discontinuous austenite grain growth is caused by disolusion of metastable carbides which have precipitated as a fine dispersion during the early stage of second hardening and that the grain coarsing on the double hardening can be controlled by intermediate heat treatment, i.e., rapid colling from α zone just under A_<C_1> or γ zone just above A_<C_3>. A heat treatment that the high speed tool steel of 6-5-4-2 type is quenched from γ zone just above A_<C_3> followed by heating at α zone just under A_<C_1>, is effective for preventing the discontinuous austenite grain growth and for refining austenite grain on subsequent austenitization.
社団法人日本鉄鋼協会の論文
1977-01-01