CAJ | 학술논문

为满足某装置用阀门密封面材料不能含有钴的要求,通过激光熔覆两种无钴镍基合金粉末,在0Cr18Ni10Ti不锈钢表面制备出具有梯度硬度分布的较厚涂层,分析了涂层的微观组织、硬度及界面结合强度.结果表明,采用硬度较低的镍基合金涂层作为过渡层,解决了具有较高硬度镍基合金涂层的开裂问题:涂层与基体及两种镍基合金涂层之间界面连续过渡,硬度呈梯度变化,涂层表面硬度达HRC47:涂层与基体界面为完全冶金结合,其界面结合强度大于565MPa:经弯曲及热震试验后,涂层未出现开裂及剥落现象,说明涂层具有良好的抗热震性能.
위만족모장치용벌문밀봉면재료불능함유고적요구,통과격광용복량충무고얼기합금분말,재0Cr18Ni10Ti불수강표면제비출구유제도경도분포적교후도층,분석료도층적미관조직、경도급계면결합강도.결과표명,채용경도교저적얼기합금도층작위과도층,해결료구유교고경도얼기합금도층적개렬문제:도층여기체급량충얼기합금도층지간계면련속과도,경도정제도변화,도층표면경도체HRC47:도층여기체계면위완전야금결합,기계면결합강도대우565MPa:경만곡급열진시험후,도층미출현개렬급박락현상,설명도층구유량호적항열진성능.
To meet the cobalt-free requirement for a certain valve,thicker coating with gradient hardness distribution was prepared on 0Cr18Ni10Ti stainless steel by laser cladding two kinds of cobalt-free nickel-based alloy powder.The microstructure,hardness and the interface bonding strength of the coating were analyzed.The results showed that using nickel-based alloy with lower hardness as a transition layer,the problem of cracking for nickel-based alloy coating with higher hardness could be resolved.The interfaces between the coating and the substrate as well as these two nickel-based alloy coatings were smoothly transited.The hardness was also gradient along the cross-section of the coating.The hardness of the coating surface was about HRC47.The coating was metallurgically bonded with the substrate.And the interface bonding strength of the coating was higher than 565MPa.There was no de-bonding and cracking after bending and thermal shock test,indicating the good anti-thermal shock property of the coating.