CAJ | 학술논문

选用无钴NOREM02铁基粉末在不锈钢基体上进行激光熔覆.对在不同工艺参数下熔覆层形貌、微观组织及显微硬度进行观察和测试,并进行了物相分析.采用静态浸泡法对NOREM02铁基激光熔覆层的耐腐性进行研究,并与Stellite6钴基熔覆层和不锈钢基体对比.结果表明:NOREM02铁基粉末在优化的激光熔覆工艺参数下,可获得表面连续光滑,宽度和厚度均匀的熔覆层.该熔覆层组织致密,晶粒细小,结合区牢固,显微硬度600 HV0.5以上,具有强韧两相组成(奥氏体和M_7C_3)的微观特征.在10% H_2SO_4和10% NaCl溶液中铁基熔覆层抗腐蚀性能接近钴基熔覆层.
선용무고NOREM02철기분말재불수강기체상진행격광용복.대재불동공예삼수하용복층형모、미관조직급현미경도진행관찰화측시,병진행료물상분석.채용정태침포법대NOREM02철기격광용복층적내부성진행연구,병여Stellite6고기용복층화불수강기체대비.결과표명:NOREM02철기분말재우화적격광용복공예삼수하,가획득표면련속광활,관도화후도균균적용복층.해용복층조직치밀,정립세소,결합구뢰고,현미경도600 HV0.5이상,구유강인량상조성(오씨체화M_7C_3)적미관특정.재10% H_2SO_4화10% NaCl용액중철기용복층항부식성능접근고기용복층.
NOREM02 Fe-based alloy was selected to produce hard coating by laser cladding on the stainless steel substrate,for its good evaluation in some foreign hardfacing applications to replace cobalt-based alloys.The macro morphology,microstructure and micro-hardness of the single passes,manufactured with different processing parameters,were observed and measured,and moreover the phases of coatings were analyzed.The corrosion resistance of Fe-based coatings was investigated with the method of static immersion.The experimental results showed that:the continuous and smooth coatings manufactured in the optimized processing parameters can be obtained in the features of homogeneous width and heights.The coatings had dense microstructure,fine grain and firm metallurgical bonding,with 600 HV0.5 and above micro-hardness.The phases were mainly consisted by austenite and M_7C_3,in which austenite was served as ductile matrix and M_7C_3 as reinforcement phases.The Fe-based coatings showed well corrosion resistance in the solution of 10% H_2SO_4 and 10% NaCl,matching to Co-based coatings.