Formation of White Layer on the Grinding Surface of Ni-Based Single Crystal Superalloy

doi:10.12068/j.issn.1005-3026.2024.09.011

Abstract

Abstract:

Surface integrity is very important to the service performance and lifespan of parts， but research of the microstructure evolution mechanism of single crystal superalloy during machining is still lacking. The grinding force and temperature of single crystal superalloy were collected， and the microstructure changes and microhardness on the grinding subsurface were characterized. The characteristics of the white layer were studied as well. The results showed that in the range of test parameters， the grinding force and temperature increase remarkably with the grinding depth increasing， and the thickness of the white layer and the plastic deformation layer increases with the increase of grinding depth and feed speed. The element diffusion is found between the white layer and the plastic deformation layer， resulting in rich Al and Ta elements in the white layer. The surface microhardness increases after grinding， and the hardening degree rises with the increase of grinding depth and feed speed.

Key words: Ni?based single crystal superalloy, grinding, white layer, element diffusion, work hardening

CLC Number:

TH 161

Yun-chao XU, Ya-dong GONG, Jin-min TIAN, Wei-jian ZHANG. Formation of White Layer on the Grinding Surface of Ni-Based Single Crystal Superalloy[J]. Journal of Northeastern University(Natural Science), 2024, 45(9): 1301-1308.

Figures/Tables 14

Table 1 Chemical composition of DD5 （mass fraction） %

Al	Cr	Co	Ti	Mo	Ta	W	Re	Ni
6.2	7.0	7.5	0.1	1.5	6.5	5.0	3.0	余量

Fig.1 Original microstructure and element content of single crystal superalloy

Table 2 Grinding parameters of single crystal

序号	磨削速度v_s	磨削深度a_p	进给速度v_f
序号	m·s^-1	μm	m·min^-1
1	15.7	50	0.6
2	20.9	50	0.6
3	26.1	50	0.6
4	31.4	50	0.6
5	26.1	10	0.6
6	26.1	20	0.6
7	26.1	100	0.6
8	26.1	50	0.2
9	26.1	50	0.4
10	26.1	50	0.8

Fig.2 Grinding force acquisition device

Fig.3 Grinding temperature acquisition device

Fig.4 Calibration of the semi-artificial thermocouple

Fig.5 Changes of grinding temperature and grinding force with grinding speed

Fig.6 Changes of grinding temperature and grinding force with grinding depth

Fig.7 Changes of grinding temperature and grinding force with feeding speed

Fig.8 Typical characteristics of microstructure change on the surface induced by grinding

Fig.9 Influence of grinding parameters on thickness of the white layer and the plastic deformation layer

Fig.10 Element content of points on the ground subsurface

Fig.11 Element content along the lines on the ground subsurface

Fig.12 Variation of microhardness on the subsurface with grinding parameters

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