MICROSTRUCTURE AND MECHANICAL PROPERTIES OF K4202 CAST NICKEL BASE SUPERALLOY FABRICATED BY SELECTIVE LASER MELTING

doi:10.11900/0412.1961.2015.00655

Acta Metall Sin

2016, Vol. 52

Issue (9): 1089-1095 DOI: 10.11900/0412.1961.2015.00655

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MICROSTRUCTURE AND MECHANICAL PROPERTIES OF K4202 CAST NICKEL BASE SUPERALLOY FABRICATED BY SELECTIVE LASER MELTING

Wenpu HUANG,Hanchen YU,Jie YIN,Zemin WANG(

),Xiaoyan ZENG

Wuhan National Laboratory of Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China

Cite this article:

Wenpu HUANG,Hanchen YU,Jie YIN,Zemin WANG,Xiaoyan ZENG. MICROSTRUCTURE AND MECHANICAL PROPERTIES OF K4202 CAST NICKEL BASE SUPERALLOY FABRICATED BY SELECTIVE LASER MELTING. Acta Metall Sin, 2016, 52(9): 1089-1095.

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Abstract

As a cast nickel base superalloy, K4202 is mainly used in aircraft engines due to its high strengths at elevated temperatures, excellent resistance to hot corrosion and favorable weldability. K4202 alloy is usually fabricated by the conventional casting method and mechanical processing, along with macro-segregation and excessive tool wear. As one of the most promising additive manufacturing technologies, selective laser melting (SLM) is able to manufacture high-performance and complex components. According to the requirement of selective laser melting manufactured metal parts with complex structures in aerospace and other fields, K4202 alloy was used as material for SLM in this research and the forming technology, microstructure and mechanical properties of SLMed and heat-treated samples were studied. The results show that the microstructure of samples formed by SLM is composed of dendrites and isometric crystal. The growing direction of dendrites is nearly perpendicular to melt pool traces in most cases. The dendrite structures disappear completely after solution+ageing heat treatment on account of recrystallization and metal carbide precipitates in grains and at grain boundaries. The precipitates are able to improve the strength of the grain boundary due to the pinning effect. The microstructure has no significant changes after ageing heat treatment, but carbide precipitates at grain boundaries as well. The microhardness of SLM samples is uniform on cross section and vertical section. After solution+ageing and ageing heat treatment, there is a significant improvement on the microhardness. The mechanical properties for as-fabricated samples are superior to those of the cast K4202. Besides, the yield strength and tensile strength increase clearly after heat treatments and the mechanical properties is the highest after ageing heat treatment. This is because of the precipitation of γ' strengthening phases. However, the obvious decrease in the ductility occurs at the same time.

Key words: K4202 alloy selective laser melting forming technology microstructure mechanical property

Received: 22 December 2015

Fund: Supported by High Technology Research and Development Program of China (No.2013AA031606)

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	Wenpu HUANG
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	Zemin WANG
	Xiaoyan ZENG

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https://www.ams.org.cn/EN/10.11900/0412.1961.2015.00655 OR https://www.ams.org.cn/EN/Y2016/V52/I9/1089

Fig.1 Schematic of tensile sample (unit: mm)

Fig.2 SEM image of K4202 powder

Fig.3 OM (a, c) and SEM (b, d) images of selective laser melting (SLM) samples on vertical section (a, b) and cross section (c, d)

Fig.4 OM (a) and SEM (b) images of HT1 sample on vertical section, and EDS results of the positions P1 (c) and P2 (d) shown in Fig.4b

Fig.5 OM (a) and SEM (b) images of HT2 sample on vertical section

Fig.6 XRD spectra for K4202 alloy samples at different states

Fig.7 Microhardnesses of K4202 alloy samples at diff

Fig.8 Tensile curves of K4202 alloy samples at different states erent states

Table 1 Tensile properties of K4202 alloy at different states

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