Relationship of microstructure transformation and hardening behavior of type 17-4 PH stainless steel

Jun Wang; Hong Zou; Cong Li; Ruling Zuo; Shaoyu Qiu; Baoluo Shen

doi:10.1016/S1005-8850(06)60050-9

Volume 13 Issue 3

Jun. 2006

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International Journal of Minerals, Metallurgy and Materials > 2006 > 13(3): 235-239. > DOI: 10.1016/S1005-8850(06)60050-9

Jun Wang, Hong Zou, Cong Li, Ruling Zuo, Shaoyu Qiu, and Baoluo Shen, Relationship of microstructure transformation and hardening behavior of type 17-4 PH stainless steel, J. Univ. Sci. Technol. Beijing , 13(2006), No. 3, pp.235-239. https://dx.doi.org/10.1016/S1005-8850(06)60050-9

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Materials

Relationship of microstructure transformation and hardening behavior of type 17-4 PH stainless steel

Jun Wang^1), ,,
Hong Zou²⁾,
Cong Li²⁾,
Ruling Zuo³⁾,
Shaoyu Qiu²⁾ and
Baoluo Shen¹⁾

Author Affilications

School of Materials Science and Engineering, Sichuan University, Chengdu 610064, China
National Key Laboratory for Nuclear Fuel and Materials, Nuclear Power Institute of China, P.O. Box 436, Chengdu 610041, China
School of Materials Science and Engineering, Chongqing University, Chongqing 400044, China

Funds:

This work was financially supported by the Key Nuclear Fuel and Nuclear Materials Laboratory of China(No.51481080104ZS8501).

Received: 11 January 2005;

Graphical Abstract

Abstract

Abstract

The relationship between the microstructure transformation of type 17-4 PH stainless steel and the aging hardening behavior was investigated. The results showed that, when 17-4 PH stainless steel aging at 595°C, the bulk hardness of samples attains its peak value (42.5 HRC) for about 20 min, and then decreases at all time. TEM revealed the microstructure corresponding with peak hardness is that the fine spheroid-shape copper with the fcc crystal structure and the fiber-shape secondary carbide M₂₃C₆ precipitated from the lath martensite matrix. Both precipitations of copper and M₂₃C₆ are the reasons for strengthening of the alloy at this temperature. With the extension of holding time at this temperature, the copper and secondary carbide grow and lose the coherent relationship with the matrix, so the bulk hardness of samples decreases.
- 17-4 PH stainless steel,
- H1100 condition,
- precipitation,
- copper,
- secondary carbide

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