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Influence of chemical composition and cold deformation on aging precipitation behavior of high nitrogen austenitic stainless steels

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Abstract

The influence of chemical composition and cold deformation on aging precipitation behavior of 18Cr-16Mn-2Mo-1.1N (HNS-A), 18Cr-16Mn-1.3N (HNS-B), 18Cr-18Mn-2Mo-0.96N (HNS-C) and 18Cr-18Mn-2Mo-0.77N (HNS-D) high nitrogen austenitic stainless steels was investigated. The results show that the “nose” temperatures and incubation periods of the initial time-temperature-precipitation (TTP) curves of aged HNSs are found to be 850 °C, 60 s; 850 °C, 45 s; 850 °C, 60 s and 900 °C, 90 s, respectively. Based on the analysis of SAD patterns, the coarse cellular Cr2N precipitate which presents a lamellar structure has a hexagonal structure of a=0.478 nm and c=0.444 nm. The χ phase corresponding to a composition of Fe36Cr12Mo10, is determined to be a body-centered cubic structure of a=0.892 nm. The precipitating sensitivity presents no more difference with the nitrogen content increasing from 0.77% to 0.96%, but exhibits so obviously that the cellular precipitates nearly overspread the whole field. The addition of Mo element can restrain the TTP curves moving left and down, which means decreasing the sensitivity of aging precipitation. With increasing the cold deformation, the sensitivity of precipitation increases obviously.

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Authors and Affiliations

  1. School of Materials and Metallurgy, Northeastern University, Shenyang, 110819, China

    Hua-bing Li  (李花兵), Zhou-hua Jiang  (姜周华), Hao Feng  (冯浩), Hong-chun Zhu  (朱红春) & Zu-rui Zhang  (张祖瑞)

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  1. Hua-bing Li  (李花兵)
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  2. Zhou-hua Jiang  (姜周华)
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  3. Hao Feng  (冯浩)
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  4. Hong-chun Zhu  (朱红春)
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  5. Zu-rui Zhang  (张祖瑞)
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Correspondence to Zhou-hua Jiang  (姜周华).

Additional information

Foundation item: Project(51304041) supported by the National Natural Science Foundation of China; Project(N100402015) supported by Fundamental Research Funds for the Central Universities of China; Project(2012AA03A502) supported by the National High Technology Research and Development Program of China; Project supported by Program for Liaoning Innovative Research Team in University, China

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Li, Hb., Jiang, Zh., Feng, H. et al. Influence of chemical composition and cold deformation on aging precipitation behavior of high nitrogen austenitic stainless steels. J. Cent. South Univ. 20, 3354–3362 (2013). https://doi.org/10.1007/s11771-013-1859-2

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  • DOI: https://doi.org/10.1007/s11771-013-1859-2

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