The Relationship Between Surface roughening and Resistance Heating in Austenitic Thin Metal Foils of SUS 304 and SUS 316 During Tensile Test
Keywords:
Resistance heating (RH), martensitic phase transformation (MPT), grain misorientation (GMO), thin metal foils (TMF), increasing surface roughness (ΔRa).Abstract
The effect of resistance heating (RH) on the surface roughening (Ra) of thin metal foils (TMF), SUS 304 and SUS 316, were investigated using tensile testing at an elevated temperature of 500oC with 1.5% as the low strain level and 2.5% as the high strain level for one cycle. A total of five cycles were conducted. After each tensile test cycle, the Ra was measured. The results show that Ra increased proportionally both at the low and high strain levels. The Ra increase was similar in the fine grains of SUS 304 and SUS 316 TMF with the same strain level. The Ra increase was higher in SUS 316 compared to SUS 304 TMF, both at the low and high strain levels. The inhomogeneous grain strength between SUS 304 and SUS 316 TMF was similar in the fine grains but differed in the coarse grains. Using an electron microscope, the electron backscattered diffraction (SEM-EBSD) scanning result was obtained and showed the grain misorientation effect on the inhomogeneous grain strength.
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