Effect of Tempering Temperature on Microstructure and Mechanical Properties of Rotary Swaged W-Ni-Cu-Co Alloy AITranslate

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Chinese Library Classification Number:TG146.23[一般工业技术]

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The W-Ni-Cu-Co alloy was prepared by liquid-phase sintering and rotary swaging,and the effects of different tempering temperatures on its microstructure and mechanical properties were investigated.The results show that the W-Ni-Cu-Co alloy mainly consists of W phase andγphase after rotary swaging.Tem-pering treatment at appropriate temperature can effectively eliminate the residual stress caused by rotary swaging,promote atomic diffusion and rearrangement,and result in a more uniform W particle size distri-bution.Additionally,the interfacial bonding strength between W andγphases is higher,and the plastic de-formation capability of W particles is enhanced.The W-Ni-Cu-Co alloy exhibits optimal mechanical proper-ties when tempered at 500℃,with tensile strength,elongation at break,and microhardness of 804 MPa,8.3%,and 445 HV1,respectively.The tensile fracture mode is cleavage fracture of W particles.Excessive tempering temperature leads to the generation and growth of brittle WNi4 phases,deteriorating the me-chanical properties of the alloy.The fracture mode transforms into intergranular brittle fracture due to W-γinterface failure.