The impact of powder oxygen content on formability of 12CrNi2 alloy steel fabricated by laser melting deposition

ABSTRACT

Three various 12CrNi2 alloy steels were successfully fabricated on 35CrMo alloy steel by laser melting deposition with the aim of investigating the effect of powder oxygen content on formability of 12CrNi2 alloy steel. The phase constituents, macroscopic morphology, microstructure, and microhardness of powders and samples were studied by some modern analysis methods. The experimental results showed that with the increase of the oxygen content from 220 to 600 ppm, the sphericity and density of the powders gradually decreased which led to the appearance of pores in the as-deposited samples. The phase constituent of three as-deposited samples with different oxygen contents was α-Fe(M) phase. The percentage porosity in the macroscopic morphology increased with the increase of the oxygen content. Meanwhile, the high oxygen content contributed to more pores and the crack formation in the microstructure. With the increase of oxygen content, the microhardness of the as-deposited samples would decrease.

KEYWORDS:

• Laser melting deposition
• 12CrNi2 alloy steel
• oxygen content
• formability

Disclosure statement

No potential conflict of interest was reported by the authors.

Notes on contributors

X. Cui is a undergraduate. Cui’s research interest is on laser additive manufacturing.

S. Zhang is a Professor. Zhang’s research interests include laser additive manufacturing, surface modification technology, wear and corrosion.

C. H. Zhang is a Professor. Zhang’s research interests include laser additive manufacturing, surface modification technology, wear and corrosion.

C. L. Wu obtained Doctorate. Wu’s research interests include laser additive manufacturing and surface modification technology.

J. B. Zhang is an Engineer. Zhang’s research interest is on surface modification technology.

Y. Liu is an Engineer. Liu’s research interest is on surface modification technology.

Adil O. Abdullah is a Doctor. His research interest is on biomaterials.

Additional information

Funding

The authors gratefully acknowledge to the financial support for this research from National Key Research and Development Program of China (No. 2016YFB1100204), Key Research Project from Science and Technology Commission of Liaoning Province (No. 2017106036, 2018106004) and Shenyang Science and Technology Funded Project (Nos. Z18-5-012, 18-014-4-36, 18-004-1-16, 18-201-0-02).