| Using twin-roller type melt-quenching technique, the effect of thickness on the microstructure and the tensile properties of AISI 304 stainless steel were investigated by optical microscope, X-ray diffractometer and tensile test. In AISI 304 stainless steel, sheets whose thickness was 0.3-1.0 ㎜ could be produced. As the thickness increased, the cooling rate of melt-quenched AISI 304 stainless steel decreased. The microstructure of 0.8 ㎜-thick sheet consisted of columnar grains which formed near the sheet surface and equiaxed grains which formed near the center of the sheet cross-section. As the thickness increased in melt-quenched AISI 304 stainless steel, the Vickers hardness, 0.2% proof stress and tensile strength increased whereas the elongation decreased. |
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