Study on the Microstructure and Mechanical Properties of 17-4 PH Stainless Steel Depending on Heat Treatment and Aging Time

Wee Do Yoo; Jong Hoon Lee; Kuk Tae Youn; Young Mok Rhyim

doi:10.4028/www.scientific.net/SSP.118.15

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Study on the Microstructure and Mechanical Properties of 17-4 PH Stainless Steel Depending on Heat Treatment and Aging Time
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HomeSolid State PhenomenaSolid State Phenomena Vol. 118Study on the Microstructure and Mechanical...

Study on the Microstructure and Mechanical Properties of 17-4 PH Stainless Steel Depending on Heat Treatment and Aging Time

Abstract:

The microstructures and mechanical properties of 17-4 PH stainless steel at each steps of heat treatment, such as homogenizing, solid solution treatment followed by aging treatment, longterm aging at 400 °C, and recovery treatment, in order to obtain a better understanding of the embrittlement phenomena on aging, was investigated. As the homogenizing treatment time increased, the length of δ-ferrite decreased and elongated shape of δ-ferrite turned to sphere shape with the decrease of volume fraction. The solution treated specimen mainly consists 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 found in the δ-ferrite at the solution treated specimen. As the aging treatment temperature increased, the strength decreased while the toughness increased. The fcc Cu-rich particles precipitated in the δ-ferrite during the long-term aging at 400 °C after the solution heat treatment. This precipitation causes the aged hardening after long-term aging accompanied by decreases in elongation and charpy V-notch energy absorption. The strength and elongation was restored after recovery treatment and the fcc-Cu precipitated were almost dissolved into the δ-ferrite matrix.

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Periodical:

Solid State Phenomena (Volume 118)

Pages:

15-20

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.118.15

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Online since:

December 2006

Authors:

Wee Do Yoo, Jong Hoon Lee, Kuk Tae Youn, Young Mok Rhyim

Keywords:

17-4 PH Stainless Steel, Copper Precipitation, Precipitation Hardening, δ-ferrite

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