13Ni-15Co-10Mo 系マルエージ鋼(400 ksi 級)の析出過程

概要

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A resistometric investigation of the presipitation process in 13Ni-15Co-10Mo 400 ksi-grade maraging steels has been made in comparing with the precipitation in 18Ni-10Co-5Mo, 14Ni-15Co-5Mo, and 14Ni-15Co-7Mo maraging steels. Two precipitation stages are observed in aging of the 400 ksi-grade maraging steels. The precipitation stages in the lower and higher temperature regions are named as stage-P_A and stage-P_B, respectively. In the precipitation of the 18Ni-10Co-5Mo, 14Ni-15Co-5Mo, and 14Ni-15Co-7Mo maraging steels, two stages are also observed. In the 18Ni-10Co-5Mo, 14Ni-15Co-5Mo, and 14Ni-15Co-7Mo maraging steels, most of the precipitateds formed in the low temperature percipitation stage are resoluted by heating to temperatures where the high temperature precipitation stage preceeds rapidly. However, the reversion of the precipitates formed in the stage-P_A of 400 ksi-grade maraging steel is relatively small in heating up to 600℃. Accordingly, it is considered that the upper limit of temperatures where the stage-P_A proceeds as the early precipitation stage of the 400 ksi-grade maraging steel is located at a relatively high temperature. The strength of the 400 ksi-grade maraging steel is reached to its maximum near the end of the stage-P_A, and is decreased gradually with the proceeding of the stage-P_B.
社団法人日本鉄鋼協会の論文
1977-03-01