| ZHOU Qi-fan,YANG De-ming,CAI Lin,GAO Yang.Effects of Microstructure on Properties of 316L Stainless Steel Coating Deposited by Low Pressure Plasma Spraying[J],47(4):58-63 |
| Effects of Microstructure on Properties of 316L Stainless Steel Coating Deposited by Low Pressure Plasma Spraying |
| Received:November 21, 2017 Revised:April 20, 2018 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2018.04.009 |
| KeyWord:low-pressure plasma spraying 316L stainless steel equiaxed grains heat treatment coating corrosion resistance |
| Author | Institution |
| ZHOU Qi-fan |
Thermal Spraying Research Center, Dalian Maritime University, Dalian , China |
| YANG De-ming |
Thermal Spraying Research Center, Dalian Maritime University, Dalian , China |
| CAI Lin |
Thermal Spraying Research Center, Dalian Maritime University, Dalian , China |
| GAO Yang |
Thermal Spraying Research Center, Dalian Maritime University, Dalian , China |
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| Abstract: |
| 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 microscope, 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/cm2, respectively in 3 hours; that of granular coating 0.0078, 0.0128, 0.0262 mg/cm2, respectively; and that of equiaxed grain coating 0.0071, 0.0100, 0.0126 mg/cm2, 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. |
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