DefinePK

Abstract

The objectives of this study were to improve the surface hardness of specimens and maintenance of JIS G3141 SPCC steel specimens by coating with TH450 Chrome Nickel Amorphous using wire arc spray and to compare the cooling rates of specimens under difference conditions. Mechanical testing was performed using Micro Vickers Hardness Tester for hardness measurement, which revealed that the average surface hardness ranged between 560-600 HV. HAZ of coated areas had different effects on cooling rate on SCCW and SCCNT specimens which showed the hardness between 155–160 HV and also showed slightly changes in microstructure. While SCCO and SCCS specimens were most affected by heat, their hardness decreased and ranged between 80-90 HV. The tensile test of uncoated and coated specimens cooled under different conditions was then conducted and it was found that the ultimate tensile strength of plain specimens was 283.35 MPa which was slightly different. However, %elongation of coated specimen was higher than that of all other specimens. On the other hand, notched and coated specimen showed the ultimate tensile strength of 342.41 MPa and was higher compared to those of all uncoated specimens. However, %elongation showed no difference. According to One-Way ANOVA, P-value in F-test was 0.000 which was statistically significant at a level of 0.01. Tukey’s multiple comparison test results and confidence levels showed the differences which were found that spray coating increased % elongation and tensile strength.