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Metallurgical and Materials Transactions A
Erschienen in: Metallurgical and Materials Transactions A 10/2020

07.08.2020

Microstructural Evolution and Mechanical Properties of Ultrafine-Grained Ferritic-Martensitic Steel During Thermal Aging

verfasst von: Shenghu Chen, Xiaojie Jin, Lijian Rong

Erschienen in: Metallurgical and Materials Transactions A | Ausgabe 10/2020

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Abstract

Microstructural evolution and mechanical properties of ultrafine-grained 9Cr2WVTa ferritic-martensitic steel via isothermal aging at 823 K to 923 K was studied. Fine dispersed carbides with a low coarsening rate could effectively impede migration of grain boundaries via the Zener pinning effect in the ultrafine-grained 9Cr2WVTa during thermal aging at 823 K, which is responsible for the good microstructural stability. Higher strength and higher ductility are present in the ultrafine-grained 9Cr2WVTa than those of tempered 9Cr2WVTa after thermal aging at 823 K up to 5000 hours. Laves phase precipitating adjacent to carbides at subgrain/grain boundaries grow into fine rod-like shape along grain boundaries in ultrafine-grained 9Cr2WVTa, while granular-like Laves phase is resulted in tempered 9Cr2WVTa. Newly formed nanometer-size Laves phase could provide precipitation strengthening to compensate loss of solid solution hardening, and relatively homogenous precipitation of Laves phase could considerably suppress microcrack formation in ultrafine-grained 9Cr2WVTa. However, abnormal grain growth is induced by the non-uniformity of pinning efficiency in the ultrafine-grained 9Cr2WVTa during thermal aging at 923 K. The abnormal grain growth leads to a significant reduction in the strengthening effect from subgrain hardening, which is more than three times larger than the Orowan stress from particle hardening, thus a dramatic decrease in the micro-hardness is resulted.
Vorheriger Artikel Effect of Ag Addition on the Hot Deformation, Constitutive Equations and Processing Maps of a Hot Extruded Mg-Gd-Y Alloy
Nächster Artikel Effect of Ageing on Microstructure, Mechanical Properties and Creep Behavior of Alloy 740H

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Metadaten
Titel
Microstructural Evolution and Mechanical Properties of Ultrafine-Grained Ferritic-Martensitic Steel During Thermal Aging
verfasst von
Shenghu Chen
Xiaojie Jin
Lijian Rong
Publikationsdatum
07.08.2020
Verlag
Springer US
Erschienen in
Metallurgical and Materials Transactions A / Ausgabe 10/2020
Print ISSN: 1073-5623
Elektronische ISSN: 1543-1940
DOI
https://doi.org/10.1007/s11661-020-05939-2

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