Distinguishing Features of Quenched Nanoprecipitates in Allotriomorphic Ferrite and Reverted γ during Aging for Dual-Phase PHSS

Ping-Jui Yu; Tzu-Ching Tsao; Cheng-An Hsu; Neng-Hao Gan; Shing-Hoa Wang; Jer-Ren Yang; Horng-Yi Chang; Tsai-Fu Chung

doi:10.3390/met13030625

Metals (Mar 2023)

Distinguishing Features of Quenched Nanoprecipitates in Allotriomorphic Ferrite and Reverted γ during Aging for Dual-Phase PHSS

Ping-Jui Yu,
Tzu-Ching Tsao,
Cheng-An Hsu,
Neng-Hao Gan,
Shing-Hoa Wang,
Jer-Ren Yang,
Horng-Yi Chang,
Tsai-Fu Chung

Affiliations

Ping-Jui Yu: Department of Mechanical Engineering, National Taiwan Ocean University, Keelung 202301, Taiwan
Tzu-Ching Tsao: Department of Materials Science and Engineering, National Taiwan University, Taipei 106216, Taiwan
Cheng-An Hsu: Department of Mechanical Engineering, National Taiwan Ocean University, Keelung 202301, Taiwan
Neng-Hao Gan: Department of Mechanical Engineering, National Taiwan Ocean University, Keelung 202301, Taiwan
Shing-Hoa Wang: Department of Mechanical Engineering, National Taiwan Ocean University, Keelung 202301, Taiwan
Jer-Ren Yang: Department of Materials Science and Engineering, National Taiwan University, Taipei 106216, Taiwan
Horng-Yi Chang: Department of Marine Engineering, National Taiwan Ocean University, Keelung 202301, Taiwan
Tsai-Fu Chung: Department of Materials Science and Engineering, National Yang Ming Chiao Tung University, Hsinchu 300093, Taiwan

DOI: https://doi.org/10.3390/met13030625
Journal volume & issue: Vol. 13, no. 3
p. 625

Abstract

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A novel dual-phase PHSS consisting of lath martensite plus allotriomorphic δ ferrite (ALF) with nanoprecipitates was characterized by high-resolution field emission transmission electron microscopy for quenched, solid-solution-treated, and aged stainless steel. The effects of aging at various durations prior to H2O or liquid N2 quenching were investigated. Cu-rich nanoprecipitates evolve from body-centered cubic clusters to 9R Cu under quenching to 3R Cu and subsequently to face-centered cubic ε-Cu at various aging durations. Maximum hardness was observed after aging at 600 °C for 1 h. However, after this aging, both reversed austenite and Cu-rich nanoprecipitates coexisted in the martensite matrix. The segregation and diffusion of austenite-stabilizing elements promoted the nucleation of reversed austenite.

Published in Metals

ISSN: 2075-4701 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Technology: Mining engineering. Metallurgy
Website: http://www.mdpi.com/journal/metals

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