Compressive Strength and Interface Microstructure of PCBN Grains Brazed with High-Frequency Induction Heating Method

doi:10.1007/s40195-017-0570-y

Abstract

Abstract:

In order to prepare monolayer brazed superabrasive wheels, the polycrystalline cubic boron nitride (PCBN) grains were brazed to AISI 1045 steel matrix with Ag-Cu-Ti filler alloy using the high-frequency induction heating technique. The compressive strengths of brazed grains were measured. Morphology, chemical composition and phase component of the brazing resultant around PCBN grain were also characterized. The results show that the maximum compressive strength of brazed grains is obtained in the case of brazing temperature of 965 °C, which does not decrease the original grain strength. Strong joining between Ag-Cu-Ti alloy and PCBN grains is dependent on the brazing resultants, such as TiB₂, TiN and AlTi₃, the formation mechanism of which is also discussed. Under the given experimental conditions, the optimum heating parameters were determined to be current magnitude of 24 A and scanning speed of 0.5 mm/s. Finally, the brazing-induced residual tensile stress, which has a great influence on the grain fracture behavior in grinding, was determined through finite element analysis.

Key words: High-frequency induction brazing, PCBN grain, Compressive strength, Interface microstructure, Residual stress

Ye-Jun Zhu, Wen-Feng Ding, Ze-Yu Zhao, Yu-Can Fu, Hong-Hua Su. Compressive Strength and Interface Microstructure of PCBN Grains Brazed with High-Frequency Induction Heating Method[J]. Acta Metallurgica Sinica (English Letters), 2017, 30(7): 641-649.

Figures/Tables 12

Fig. 1 Schematic diagram of PCBN grains: a micrograph of original PCBN grains, b schematic diagram of brazed PCBN grains

Table 1 Measured brazing temperatures of PCBN grains under different heating parameters

Sample No.	Current magnitude, I (A)	Scanning speed, v (mm/s)	Highest heating temperature, T (°C)
1	Original grains
2	20	0.5	823
3	22	0.5	900
4	24	1	852
5	24	0.5	965
6	24	0.25	1087
7	26	0.5	1030

Fig. 2 Schematic representation of induction brazing of PCBN grains: a brazing equipment, b schematic diagram

Fig. 3 Heating temperature curves obtained at Point A versus heating parameters: a current magnitudes; b scanning speeds

Fig. 4 Compressive strength of brazed PCBN grains versus heating parameters: a current magnitudes; b scanning speeds

Fig. 5 Weibull distribution of grain compressive strength versus heating parameters: a current magnitudes; b scanning speeds

Fig. 6 Interfacial microstructure of brazed PCBN grains: a whole morphology, b joining interface, c element distribution curves

Fig. 7 Brazing resultant morphologies: a original grains, b Sample No. 4, c Sample No. 5, d Sample No. 6

Table 2 EDS analysis results at different detection positions

Detection positions	Chemical composition (at.%)
Detection positions	Ti	B	N	Al
A	0	35.1	19.2	45.84
B	40.22	23.1	28.3	8.33
C	35.45	25.7	17.4	21.53
D	38.62	29.3	20.1	12.06

Fig. 8 XRD spectra of brazed grains of Sample No. 5

Fig. 9 Typical contour maps of residual stress distribution in brazed PCBN grains

Fig. 10 Contour maps of residual stress distribution in PCBN grains with different volume fractions: avf = 60%, bvf =70%, cvf = 80%, dvf = 90%

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