Distinguishing Features of Quenched Nanoprecipitates in Allotriomorphic Ferrite and Reverted γ during Aging for Dual-Phase PHSS-Reference-Cited by-同舟云学术

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

Published:2023-03-21 Issue:3 Volume:13 Page:625
ISSN:2075-4701
Container-title:Metals
language:en
Short-container-title:Metals

Author:

Yu Ping-Jui¹,Tsao Tzu-Ching²^ORCID,Hsu Cheng-An¹,Gan Neng-Hao¹,Wang Shing-Hoa¹,Yang Jer-Ren²^ORCID,Chang Horng-Yi³,Chung Tsai-Fu⁴

Affiliation:

1. Department of Mechanical Engineering, National Taiwan Ocean University, Keelung 202301, Taiwan

2. Department of Materials Science and Engineering, National Taiwan University, Taipei 106216, Taiwan

3. Department of Marine Engineering, National Taiwan Ocean University, Keelung 202301, Taiwan

4. Department of Materials Science and Engineering, National Yang Ming Chiao Tung University, Hsinchu 300093, Taiwan

Abstract

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.

Funder

Ministry of Science and Technology (MOST) of Taiwan

Publisher

MDPI AG

Subject

General Materials Science,Metals and Alloys

Link

https://www.mdpi.com/2075-4701/13/3/625/pdf

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