Effects of additive manufacturing processes and isothermal aging on the microstructure and properties of 13-8 Mo precipitation hardening martensitic stainless steel

被引：26
作者：
Benoit, M. J. [1 ]
Tabaie, S. [1 ]
Waqar, T. [1 ]
Ganton, T. [1 ]
Amirkhiz, B. S. [2 ]
Hadadzadeh, A. [3 ]
Nasiri, A. [4 ]
机构：
[1] Univ British Columbia, Sch Engn, Kelowna, BC V1V 1V7, Canada
[2] CanmetMATERIALS, Nat Resources Canada, Hamilton, ON L8P 0A5, Canada
[3] Univ Memphis, Dept Mech Engn, Memphis, TN 38152 USA
[4] Dalhousie Univ, Dept Mech Engn, 1360 Barrington St, Halifax, NS B3H 4R2, Canada
来源：
ADDITIVE MANUFACTURING | 2023年 / 72卷
基金：
加拿大自然科学与工程研究理事会;
关键词：
Laser powder bed fusion; Arc directed energy deposition; Precipitation hardening martensitic stainless; steel; Isothermal aging; Hierarchical microstructure; MARAGING-STEEL; MECHANICAL-PROPERTIES; HIGH-STRENGTH; BEHAVIOR; EVOLUTION; ALLOY;
D O I：
10.1016/j.addma.2023.103615
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The objective of this study is to evaluate the effect of AM process on the microstructure and properties of PH 13-8 Mo steel in the as-printed and aged conditions. Samples were produced by both laser powder bed fusion (L-PBF) and arc directed energy deposition (arc-DED) and characterized in both the as-printed and direct aged (530 degrees C, 3 h) conditions. The as-printed L-PBF sample was characterized by a nearly fully martensitic microstructure, while the as-printed arc-DED microstructure included coarser lath martensite, 2.3 vol % retained austenite, and & delta;-ferrite. However, the hardness of the as-printed arc-DED sample (401.0 HV1) was greater than the as-printed LPBF (347.7 HV1), due to precipitation of & beta;-NiAl particles in the as-printed arc-DED condition. Aging of the L-PBF sample resulted in microstructure refinement, precipitation of & beta;-NiAl particles, and a corresponding increase in hardness to 508.3 HV1. Conversely, aging the arc-DED sample resulted in the formation of a large amount of reverted austenite (7.2 vol %), Cr23C6 particles, as well as & beta;-NiAl particles, but was unable to remove the & delta;-ferrite grains. Consequently, the hardness of the aged arc-DED sample was similar to the as-printed value (428.3 HV1). It is concluded that the selection of the AM process has an important effect on the microstructure and properties of PH 13-8 Mo steel, and that a single-step direct aging heat treatment is suitable for samples produced by L-PBF but not arc-DED.
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页数：12
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