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Embrittlement Fracture in a 17-4 PH Stainless Steel after Aging at 400°C

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Abstract:

The embrittlement fracture mechanism caused by microstructural evolution of 17-4 PH stainless steel at long term aging was studied using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The solution treated specimen consists largely of lath martensite with a small fraction of elongated δ-ferrite. The spherical particles existed a little in the martensite matrix, while no precipitates were present in the δ-ferrite at the solution treated specimen as non-aging. The precipitation of Fe-Cu in the δ-ferrite causes the aged hardening after long term aging accormpanied by decreases in elongation and charpy V-notch energy absorption. The increased fraction of brittle fracture on the fractured surface by impact and tensile test reveals that the embrittlement of the 17-4 PH alloys during long term aging is mainly caused by the precipitation hardening in the δ-ferrite matrix.

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Periodical:

Materials Science Forum (Volumes 486-487)

Pages:

241-244

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.486-487.241

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Online since:

June 2005

Authors:

Wei You, Jung Hun Lee, Soo Keun Shin, Byung Hak Choe, Ung Yu Paik, Je Hyun Lee

Keywords:

17-4 PH Stainless Steel, Embrittlement, Long Term Aging, Microstructural Evolution, δ-ferrite

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© 2005 Trans Tech Publications Ltd. All Rights Reserved

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