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

• Published in: Acta metallurgica sinica : English letters Vol. 30; no. 7; pp. 641 - 649
• Main Authors: Zhu, Ye-Jun, Ding, Wen-Feng, Zhao, Ze-Yu, Fu, Yu-Can, Su, Hong-Hua
• Format: Journal Article
• Language: English
• Published: Beijing The Chinese Society for Metals 01.07.2017; Springer Nature B.V
• Subjects: Characterization and Evaluation of Materials; Chemical composition; Chemistry and Materials Science; Compressive strength; Copper; Corrosion and Coatings; Cubic boron nitride; Finite element method; Grains; Induction heating; Materials Science; Medium carbon steels; Metallic Materials; Nanotechnology; Organometallic Chemistry; PCBN; Residual stress; Scanning electron microscopy; Silver base alloys; Spectroscopy/Spectrometry; Temperature; Tensile stress; Tribology; Wheels; 感应加热钎焊; 抗压强度; 界面微观结构; 聚晶立方氮化硼; 超硬磨料砂轮; 颗粒; 高频; PCBN grain; Compressive strength; Interface microstructure; High-frequency induction brazing; Residual stress
• ISSN: 1006-7191; 2194-1289
• DOI: 10.1007/s40195-017-0570-y

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 TiB_2, TiN and AlTi_3, 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 of0.5 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.