局部義치用 合金의 熱處理에 依한 機械的性質의 實驗的 硏究

다국어 초록 (Multilingual Abstract)

The purpose of this study was to investigate the effect of heat treatment on mechanical properties of cobalt-chromium base allays and nickel-chromium base alloys.
Two removable partial denture alloys, Regal loy(Co-Cr base alloy), and Ticonium Premium l00(Ni-Cr base alloy) were evaluated three ways :
1) in the cast condition ;
2) after heat treatment for 15 minutes at 1300, 1550, or 1800˚F followed by quenching ;
3) in quenching after heat treatment for 15 minutes at 1800˚F followed by reheating for 15 minutes at 1300˚F and quench ing.
After heat treatments, the ultimate tensile strength, the yield strength at 0.1% and 0.2% offsets, the total percent elongation, and the Rockwell 30N hardness were determined.
The data was statistically analyzed, and the microstructures were examined using a metallographic microscope.
The results were obtained as follows :
1. Ticonium Premium 100 showed higher total percent elongation and lower Rockwell 30N hardness than Regalloy.
2. The mechanical properties of Ticonium Premium 100 showed significant differences among various heat treatments, whiie those of Regalloy were found to be no significantly different.
3. For Ticonium Premium 100,higher temperatures of heat treatment decreased strength and hardness considerably, and increased total percent elongation remarkably.
4. For Ticonium Premium 100,the highest yield strength at 0.1%and 0.2% offsets was recorded when specimens were heattreated at 1300˚F.
5. After Ticonium Premium 100 was water-quenched at 1800˚F followed by reheating for 15 minutes at 1300˚F, there was a general improvement in ultimate tensile strength, hardness and total percent elongation.
6. As the heat treatment temperature increased, the microstructures of Ticonium Premium 100 showed increased homogenization between the nickel-rich and chromium-rich phase.
7. After Ticonium Premium 100 was reheated, the microstructures were found fine precipitates within 'grain.
8. The microstructures of Regalloy were relatively unchanged, while the microstructures of reheated Regalloy showed the precipitation of a small amount of carbide.

목차 (Table of Contents)

• 목차 = 1
• ABSTRACT = 2
• Ⅰ. 緖論 = 4
• Ⅱ. 實驗材料 및 方法 = 5
• Ⅲ. 實驗成績 = 9
• Ⅳ. 總括 및 考按 = 13
• Ⅴ. 結論 = 24
• 參考文獻 = 24
• 寫眞附圖 = 29