| Summary: | 碩士 === 國立屏東科技大學 === 機械工程系 === 90 === Abstract
The purposes of the present studies are to investigate the effects of forging ratio on the Fe-5.5Al-26Mn-1.0C-6.0Cr-1.2Si alloy, including the mechanical properties, heat treatment and microstructural changes. Some results are described as followings:
1.The hardness of the as-forged alloy will increase with increasing the forging ration in the rang of 30~90%. The relationship between the hardness and the forging ratio is Hardness = 94.3+4.64×exp[0.01128×V], where V is forging ratio.
2. Being solution heat-treated in the ranging of 950℃ and 1050℃, the higher forging ratio would result in the finer grain size and shorter heat-treated time.
3. Based on the examination of the sub-grain formation in 450℃, it is implied that the recrystallization temperature of the present alloy is in the range between 400~500℃. In addition, the recrystallization temperature of the alloy would be below 450℃, where the forging ration being higher than 70%.
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