Effect of Phosphorus on Age-hardening Behavior of Austenitic Heat Resisting            Steels

Ohishi Katsuhiko, Uehara Toshihiro, Takeyama Masao

doi:10.2355/tetsutohagane.tetsu-2015-105

Effect of Phosphorus on Age-hardening Behavior of Austenitic Heat Resisting Steels

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Ohishi Katsuhiko

Metallurgical Research Laboratory, Hitachi Metals, Ltd
Uehara Toshihiro

Metallurgical Research Laboratory, Hitachi Metals, Ltd
Takeyama Masao

Department of Metallurgy and Ceramics Science, Graduate School of Science and Engineering, Tokyo Institute of Technology

Bibliographic Information

Other Title

オーステナイト系耐熱鋼の時効硬化挙動に及ぼすPの影響
オーステナイトケイタイネツコウノジコウコウカキョドウニオヨボス P ノエイキョウ

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Description

The age-hardening behavior at around 750°C and microstructure analysis of experimentally prepared heat resisting steels based on SUH38 containing phosphorus in the range of 0 to 0.3 mass% have been investigated, in order to identify the formation mechanism of the homogeneous distribution of fine carbide within grain interiors (MDP: matrix dot precipitation) by the addition of phosphorus. The steel does not show age-hardening until the phosphorus content in the steel beyond 0.15 mass%, and the hardness increases from 200 HV to 350 HV with increasing phosphorus content. The high age-hardening was caused by the high density of fine M₂₃C₆ carbides with cube on cube orientation relationship between γ and M₂₃C₆. Phosphorus was found to exist in γ-matrix as substitutional manner after solution and aging treatments. The fine carbide formation mechanisms within grain interiors are attributed to an interaction between phosphorus and carbon in solution.

Journal

Tetsu-to-Hagane

Tetsu-to-Hagane 102 (7), 389-395, 2016

The Iron and Steel Institute of Japan

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