Inspection diagnosis and process improvement on end face defects of 17-4PH steel turbo shaft

doi:10.13251/j.issn.0254-6051.2021.10.046

Abstract

Abstract: Defects were found at the end face of 17-4PH steel turbo shaft after solution and aging treatment, machining forming and hard chrome plating by using magnetic particle indication, and the characteristics and causes of which were analyzed by means of chemical composition analysis, microstructure and fracture morphologies observation, hardness and residual stress testing, magnetic particle indication, and diagnosed by combining with the inspection results of the production process. The results show that the defects are hydrogen embrittlement microcracks occurred during the hard chrome plating process, and the causes of which are mainly the higher hardness and the higher residual stress of the 17-4PH steel turbo shaft. Using underaging treatment at 430 ℃ for 1 h can appropriately reduce the hardness and residual stress of the 17-4PH steel turbo shaft, and avoid the generation of hydrogen embrittlement cracks on the end face.

Key words: 17-4PH steel, turbo shaft, hydrogen embrittlement crack, residual stress, magnetic particle indication

CLC Number:

TG172

Liu Song, Han Yanchun. Inspection diagnosis and process improvement on end face defects of 17-4PH steel turbo shaft[J]. Heat Treatment of Metals, 2021, 46(10): 252-256.

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