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采用激光熔覆方法在缸套材料表面制备出高强高硬度耐磨涂层。使用光学显微镜、洛氏硬度计、磨粒磨损试验机等仪器研究了B_4C含量对涂层组织和性能的影响。结果表明:当B_4C含量为0时,涂层组织为铁素体和指纹状的共晶组织α-Fe+M_(23)C_6或α-Fe+M_3(C,B)。当B_4C含量从0增加到9%时,初生碳化物M_(23)C_6含量与晶粒尺寸都增大,而涂层硬度与耐磨性则先增加后减小。当B_4C含量为0时,其耐磨性只有基体的10倍左右。当B_4C含量为6%时,其相对耐磨性大大增加,是基体的28倍左右。
Laser cladding method was used to prepare high strength and high hardness wear-resistant coating on the surface of cylinder liner material. The effects of B 4 C content on the microstructure and properties of the coatings were investigated by using optical microscope, Rockwell hardness tester and abrasive wear tester. The results show that the microstructure of the coating is ferrite and fingerprint eutectic α-Fe + M_ (23) C_6 or α-Fe + M_3 (C, B) when B_4C content is zero. When the content of B 4 C increased from 0 to 9%, the content of M_ (23) C_6 and the grain size of primary carbides increased, while the hardness and wear resistance of the coating increased first and then decreased. When B_4C content is 0, its wear resistance is only about 10 times of matrix. When B_4C content of 6%, its relative wear resistance greatly increased, is about 28 times the matrix.