低压等离子喷涂316L不锈钢涂层组织对性能的影响  

Effects of Microstructure on Properties of 316L Stainless Steel Coating Deposited by Low Pressure Plasma Spraying

作　　者：周起帆 杨德明[1] 蔡林 高阳[1] ZHOU Qi-fan;YANG De-ming;CAI Lin;GAO Yang(Thermal Spraying Research Center, Dalian Maritime University, Dalian 116026, China)

机构地区：[1]大连海事大学热喷涂研究中心,辽宁大连116026

出　　处：《表面技术》2018年第4期58-63,共6页Surface Technology

基　　金：辽宁省自然科学基金指导计划(20170540084);中央高校基本科研业务费专项基金(3132017024)~~

摘　　要：目的研究涂层组织形貌对涂层性能的影响。方法采用低压等离子喷涂方法制备316L不锈钢涂层,通过改变喷涂条件以及热处理工艺分别得到颗粒堆积、层片状和等轴晶三种不同组织的涂层。利用金相显微镜、X射线衍射、显微硬度计和浸泡实验,分析其金相组织、相结构、显微硬度和耐腐蚀性,对比分析三种不同涂层的性能。结果等轴晶涂层只含奥氏体相,而颗粒状和层片状涂层除奥氏体相外,还有?铁素体相。层片状涂层显微硬度最高(为262 HV0.3),颗粒状涂层次之(为243 HV0.3),等轴晶涂层硬度最低(为118 HV0.3)。在浓盐酸中浸泡1、2、3 h,层片状涂层质量损失分别为0.0110、0.0262、0.0445 mg/cm^2,颗粒状涂层质量损失分别为0.0078、0.0128、0.0262 mg/cm^2,等轴晶涂层质量损失分别为0.0071、0.0100、0.0126mg/cm^2。结论层片状涂层有最高的显微硬度和最差的耐腐蚀性,等轴晶涂层则有最好的耐腐蚀性和最低的显微硬度,颗粒状涂层介于两者之间。The work aims to study effects of coating microstructure on coating properties 316L stainless steel coatings were deposited in the method of low pressure plasma spraying. Three different coatings with granular stacked, lamellar and equiaxed grain microstructures, respectively were obtained by changing spraying conditions and heat treatment process. Metallographic structure, phase composition, microhardness and corrosion resistance of the coatings were investigated with metallographic mi- croscope, X-ray diffractometer （XRD）, microhardness tester and by performing immersion test. Contrastive analysis was applied to properties of the three coatings. The equiaxed grains coating contained austenite phase only, while the granular and laminar coatings contained delta ferritic phase in addition to austenite phase. Microhardness of the laminar coating was the highest （262HV0.3）, followed by that of granular coating （243HV0.3）, and equiaxed grain coating the least （118HV0.3）. Mass loss of laminar coating soaked in concentrated hydrochloric acid per hour was 0.0110, 0.0262, 0.0445 mg/cm^2, respectively in 3 hours; that of granular coating 0.0078, 0.0128, 0.0262 mg/cm^2, respectively; and that of equiaxed grain coating 0.0071, 0.0100, 0.0126 mg/cm^2, respectively. Lamellar coating has the highest microhardness and worst corrosion resistance, equiaxed coating has the best corrosion resistance and the lowest microhardness, and granular coating is in between.

关 键 词：低压等离子喷涂 316L不锈钢 等轴晶 热处理 涂层 耐腐蚀性 

分 类 号：TG174.4[金属学及工艺—金属表面处理]