Simultaneous enhancements of strength and ductility of wire arc additive manufactured 17-4PH steel via intrinsic heat treatment

Lyu，Zhiwei1,2,4; Sato，Yutaka S.3; Xu，Wanghui4; Li，Su4; Xu，Zhen1,2; Hu，Xiaogang1,2; Li，Xinggang2; Zhu，Qiang1,2

2023-12-01

10.1016/j.jmatprotec.2023.118149

Journal of Materials Processing Technology   Impact Factor & Quartile

0924-0136

1873-4774

During wire arc additive manufacturing (WAAM), the previous deposited pass inherently experiences the intrinsic heat treatment, i.e., rapid reheating from subsequent passes. This study exploited this intrinsic heat treatment to improve the mechanical properties of as-WAAMed 17–4PH steel. By controlling the interpass temperature after each pass, we initiated martensitic transformation within the deposited layer. Subsequently, the intrinsic heat treatment induced austenite reversion and precipitation of copper-rich clusters within the formed martensitic matrix, resulting in a combination of high ultimate tensile strength (1128 ± 32 MPa) and elongation (18.5 ± 3.1%) for the as-WAAMed part. In comparison, when the austenite was kept in the previous layer during subsequent passes, the intrinsic heat treatment had minimal impact on the formed microstructure. Consequently, a coarse martensitic structure was obtained after cooling without the reversed austenite and copper-rich precipitates, leading to lower ultimate tensile strength (1036 ± 18 MPa) and elongation (13.2 ± 2.7%). The findings of this study indicate that exploiting the intrinsic heat treatment is an effective strategy for simultaneously enhancing strength and ductility of 17–4PH steels during WAAM.

17–4PH steel Intrinsic heat treatment Mechanical properties Microstructure Wire arc additive manufacturing

SCI

English

First ; Corresponding

Basic and Applied Basic Research Foundation of Guangdong Province[2022A1515110702];

Engineering ; Materials Science

Engineering, Industrial ; Engineering, Manufacturing ; Materials Science, Multidisciplinary

WOS:001073620800001

ELSEVIER SCIENCE SA

MATERIALS SCIENCE

2-s2.0-85170255119

Scopus

1.Department of Mechanical and Energy Engineering,Southern University of Science and Technology,Shenzhen,518055,China
2.Shenzhen Key Laboratory for Additive Manufacturing of High-performance Materials,Shenzhen,518055,China
3.Department of Materials Processing,Graduate School of Engineering,Tohoku University,Miyagi,980-8579,Japan
4.China-Ukraine Institute of Welding,Guangdong Academy of Sciences,Guangzhou,510650,China

Lyu，Zhiwei,Sato，Yutaka S.,Xu，Wanghui,et al. Simultaneous enhancements of strength and ductility of wire arc additive manufactured 17-4PH steel via intrinsic heat treatment[J]. Journal of Materials Processing Technology,2023,321.

Lyu，Zhiwei.,Sato，Yutaka S..,Xu，Wanghui.,Li，Su.,Xu，Zhen.,...&Zhu，Qiang.(2023).Simultaneous enhancements of strength and ductility of wire arc additive manufactured 17-4PH steel via intrinsic heat treatment.Journal of Materials Processing Technology,321.

Lyu，Zhiwei,et al."Simultaneous enhancements of strength and ductility of wire arc additive manufactured 17-4PH steel via intrinsic heat treatment".Journal of Materials Processing Technology 321(2023).