Microstructure and performance characteristics on laser cladding layer for Co-based alloy with different B contents

ZHANG Zhi-bin, SHU Feng-yuan, WANG Hui-peng, ZHU Peng-hua

Forging & Stamping Technology ›› 2022, Vol. 47 ›› Issue (9) : 218-223.

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Forging & Stamping Technology ›› 2022, Vol. 47 ›› Issue (9) : 218-223. DOI: 10.13330/j.issn.1000-3940.2022.09.032

Microstructure and performance characteristics on laser cladding layer for Co-based alloy with different B contents

  • ZHANG Zhi-bin1, SHU Feng-yuan2, WANG Hui-peng3, ZHU Peng-hua3
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Abstract

To improve the surface properties of H13 die steel, a layer of Co-based alloy powder was clad on its surface by laser, and the microstructure and mechanical properties of the cladding layer were analyzed. The results show that the microstructure of the cladding layer is mainly composed of Cr2Ni3, Fe2B, γ-Co and Co3B components. With the increasing of B content the crystalline phases of Fe, Cr and Co elements decrease, B compound increases. And from the bottom to the top of the cladding layer, B compound increases. The surfaces of the cladding layer for the samples with the B content of 7% and 19% in the alloy powder have excellent wear resistance property. Under the same wear conditions, the wear rate is low, and the wear type is mainly abrasive wear. However, the cladding layers of the samples with the B content of 11% and 15% are severely worn, and the wear types are mainly adhesive wear + peeling wear + oxidation wear. Furthermore, a large number of pores appear in the cladding layer, which reduce the wear resistance property, increase the friction factor, and increase the wear loss. When the B content is 19%, the cladding layer has a lot of cracks. Thus, comprehensive consideration, when the B content is 7%, the microstructure and performance of the cladding layer are the best.

Key words

laser cladding / Co-based alloy powder / B content / microstructure / friction and wear

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ZHANG Zhi-bin, SHU Feng-yuan, WANG Hui-peng, ZHU Peng-hua. Microstructure and performance characteristics on laser cladding layer for Co-based alloy with different B contents[J]. Forging & Stamping Technology, 2022, 47(9): 218-223 https://doi.org/10.13330/j.issn.1000-3940.2022.09.032

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