CAJ | 학술논문

采用等离子堆焊技术在打壳锤头基体Q235钢表面进行堆焊，堆焊材料选用分别含有50%WC、40%WC和30%WC+TiC的复合镍基粉末。借助金相显微镜、扫描电子显微镜、显微硬度仪、摩擦磨损试验仪等仪器对所得各堆焊层的显微组织、化学成分、显微硬度、耐磨性和耐蚀性进行分析。试验结果表明，三种合金堆焊层显微组织均为γ-Ni 固溶体和弥散分布的不同形态的硬质化合物相，如WC，(Ti,V)C等。三种合金堆焊层与基体界面处冶金结合良好，堆焊层稀释率低，且与基体Q235钢相比，耐电解腐蚀性显著提高。含有30%WC+TiC的镍基合金堆焊层与含有50%WC和40%WC的镍基合金堆焊层相比，具有更高的耐磨性和抗热腐蚀性。因而含有30%WC+TiC的镍基合金堆焊层综合性能最优，能够大幅度延长打壳锤头使用寿命，具有广泛的应用前景。
채용등리자퇴한기술재타각추두기체Q235강표면진행퇴한，퇴한재료선용분별함유50%WC、40%WC화30%WC+TiC적복합얼기분말。차조금상현미경、소묘전자현미경、현미경도의、마찰마손시험의등의기대소득각퇴한층적현미조직、화학성분、현미경도、내마성화내식성진행분석。시험결과표명，삼충합금퇴한층현미조직균위γ-Ni 고용체화미산분포적불동형태적경질화합물상，여WC，(Ti,V)C등。삼충합금퇴한층여기체계면처야금결합량호，퇴한층희석솔저，차여기체Q235강상비，내전해부식성현저제고。함유30%WC+TiC적얼기합금퇴한층여함유50%WC화40%WC적얼기합금퇴한층상비，구유경고적내마성화항열부식성。인이함유30%WC+TiC적얼기합금퇴한층종합성능최우，능구대폭도연장타각추두사용수명，구유엄범적응용전경。
Nickel-based alloy coatings are deposited on the surface of crust breaker made of Q235 steel through plasma arc welding with the nickel-based powders containing 50% WC, 40% WC and 30% WC+TiC, respectively. And the microstructure, chemical composition, micro-hardness, abrasive resistance and corrosion resistance are examined on the samples investigated by using optical microscope(OM), scanning electron microscope(SEM), Vickers hardness tester and friction and wear testing machine. The microstructures of the coatings are γ-Ni solid solution and hard dispersed compound particles, such as WC, (Ti, V) C, etc. The coatings with low dilution rate possess a better metallurgical bonding with the matrix metal, and better electrolytic corrosion resistance compared with the Q235 matrix. The Nickel-based alloy coating containing 30%WC+TiC has the highest wear resistance and hot corrosion resistance in comparison with the coatings containing 50%WC and 40%WC. Therefore, the Nickel-based alloy coating layer containing 30%WC+TiC has the optimum comprehensive properties and extensive application prospect.