等离子弧堆焊WC增强镍基堆焊层的组织及耐磨性研究

Microstructure and Wear Resistance of Plasma Arc Surfacing WC Reinforced Nickel-Based Surfacing Layer

为了研究不同含量的WC对镍基合金堆焊层组织及性能的影响,采用等离子堆焊在Q235钢板上制备了不同含量WC的镍基合金堆焊层。对堆焊层的物相、微观组织、维氏硬度、耐磨性进行分析。结果表明:添加不同含量WC后,堆焊层的物相主要为γ-Ni、M_(23)C_(6)、M_(6)C、Cr_(7)C_(3)、WC、W_(2)C及FeNi_(3)相;当WC添加量为30wt%时,堆焊层中部的共晶组织开始由片层状向块状发生转变,同时堆焊层的维氏硬度分布较为稳定,平均值为767.2 HV0.5,在室温条件下磨损失重最小,为3.9 mg;室温下堆焊层的磨损机理都以剥层磨损为主,其中30wt%WC添加量的堆焊层有最小的剥层破坏。

In order to study the influence of WC with different conetent on the microstructure and properties of Ni-based alloy surfacing layer,the Ni-based alloy surfacing layer with different WC contents was prepared on Q235 steel plate by plasma surfacing.The phase,microstructure,Vickers hardness and wear resistance of the surfacing layer were analyzed.The results show that:after adding WC with different contents,the main phases in the surfacing layer are γ-Ni,M_(23)C_6,M_6C,Cr_7C_3,WC,W_(2C) and FeNi_(3) phase.When the WC content is 30wt%,the eutectic structure in the middle of the surfacing layer changes from lamellar to massive,and the Vickers hardness distribution of the surfacing layer is relatively stable,with an average value of 767.2HV0.5,and the minimum wear loss at room temperature is 3.9 mg.The wear mechanism of the surfacing layers at room temperature is mainly delamination wear,and the surfacing layer with 30wt%WC has the smallest delamination damage.