15Cr-14Ni 系耐熱鋼の微細組織と硬さにおよぼす Mo と熱処理の影響

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The effects of molybdenum and heat treatment on the micro-structure and hardness of 0.15C-15Cr-14Ni heat resisting steels have been investigated in both solution treated and aged conditions. Structural examination has been made using optical and electron microscopies and X-ray diffraction analysis of electrolytically extracted residues. The results are as follows : The carbon solubilities of the steels after solution treatments were determined by electrolytical isolation method. It was shown that the dissolved carbon content decreased progressively with molybdenum content. In these conditions the undissolved carbidies, mainly M_<23>C_6, tended to coarsen with increase of solution temperature and of molybdenum content. Below 1% molybdenum, the coasening was not remarkable but over this content there was progressive increase in the diameter of undissolved carbide. It was founed that the distribution of this particle increased with increase of molybdenum content and with decrease of solution temperature, and had an important effect on the hardeness and the austenite grain size. During the aging of the steels, massive, cubic, and ribbon-like M_<23>C_6 and rod-like M_6C precipitated. From the results of the microstructural observation and hardness testing, it was found that there was a linear relationship between the logarithm of distribution density of cubic M_<23>C_6 plus rod-like M_6C and the logarithm of amount of age-hardening.
社団法人日本鉄鋼協会の論文
1974-09-01

15Cr-14Ni 系耐熱鋼の微細組織と硬さにおよぼす Mo と熱処理の影響

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