Effect of Cr-Content on Microstructure of 12CrNi2 Alloy Steel Prepared by Laser Additive Manufacturing

doi:10.11901/1005.3093.2017.582

Chinese Journal of Materials Research

2018, Vol. 32

Issue (11): 827-833 DOI: 10.11901/1005.3093.2017.582

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Effect of Cr-Content on Microstructure of 12CrNi2 Alloy Steel Prepared by Laser Additive Manufacturing

Zhihong DONG¹(

), Hongwei KANG², Yujiang XIE¹, Changtai CHI¹, Xiao PENG³

1 Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2 College of Material Science and Engineering, University of Science and Technology of China, Hefei 230026, China
3 School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063, China

Cite this article:

Zhihong DONG, Hongwei KANG, Yujiang XIE, Changtai CHI, Xiao PENG. Effect of Cr-Content on Microstructure of 12CrNi2 Alloy Steel Prepared by Laser Additive Manufacturing. Chinese Journal of Materials Research, 2018, 32(11): 827-833.

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Abstract

12CrNi2 alloy steel has been prepared by means of laser additive manufacturing (LAM) using a commercial alloy steel powder. The results show that the LAMed alloy steel contains a large number of pores intrinsically associated with the reaction of O and C, which form gases in molten pool of the laser melting alloy steel powder. The pore formation can be highly suppressed by adding into the steel powder with small amounts of Cr, because it preferentially reacts with O to form Cr₂O₃ and consequently prevents the gases formation in the molten pool. The Cr₂O₃ formation also refines the ferrite and the austenite phases of the LAMed alloy steel and increases its hardness.

Key words: metallic materials microstructure laser additive manufacturing Cr content alloy steel

Received: 10 October 2017

ZTFLH:

TG142.1

Fund: Supported by the National Key Research and Development Program of China (No. 2016YFB1100203)

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	Zhihong DONG
	Hongwei KANG
	Yujiang XIE
	Changtai CHI
	Xiao PENG

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https://www.cjmr.org/EN/10.11901/1005.3093.2017.582 OR https://www.cjmr.org/EN/Y2018/V32/I11/827

Table 1 Chemical compositions of 12CrNi2 alloy steel powder (%, mass fraction)

Fig.1 Schematic diagram of the LMD process

Fig.2 Surface (a) and cross sectional (b) morphologies of the as-received 12CrNi2 alloy steel particles

Table 2 Chemical compositions of the oxide layer on the as-received 12CrNi2 particles

Fig.3 SEM cross-sectional images of the LMDed 12CrNi2 alloy steel without (a) and with addition of 4% (b) Cr

Fig.4 ΔG⁰ of possible chemical reactions in the melted pool as a function of temperature

Fig.5 Backscattered electron image of the LMDed alloy steel

Fig.6 TEM image of a Cr-rich particle precipitated in the LMDed alloy steel and its selected area electron diffraction pattern and elemental mapping

Fig.7 OM image (a), BEI image (b) and corresponding C X-ray mapping (c) of the LMDed alloy steel, and selected area electron diffraction patterns of the main phase (d) and the island phase (e)

Fig.8 XRD patterns of the LMDed alloy steel with different Cr content

Fig.9 OM images of the LMDed alloy steel when Cr content increased by (a) 2%, (b) 3% and (c) 4%,the inset in (b) showing the C X-ray mapping

Fig.10 Microhardness of the LMDed alloy steel with different Cr content

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