Ni-Cr-Mo鋼의 熱處理에 따른 機械的 性質과 衝擊靭性에 關한 硏究 = A Study on the Effect of Heat Treatment on the Mechanical Properties and impact Toughness of Ni-Cr-Mo steel

다국어 초록 (Multilingual Abstract)

The influence of heat treatment on the mechanical properties and the charpy impact toughness of Ni-Cr-Mo Steel in austenitizing temperature range between 750℃~1100℃ and tempering temperature range between 250℃~500℃ was studied. The results obtained from this study are summarized as follows;
1) The most impact energy is obtained at about 900℃ of austenitizing temperature, and at the temperature of more than 900℃, impact energy decreased. That was seen to be caused from coarse of martensite structure.
2) As the austenitizing temperature increased, strength and elongation decreased. As tempering temperature increased, strength and hardness decreased, but elongation increased.
3) When the tempering temperature was 350℃, the impact energy was lowest and as the temperature was high, the impact energy increased.
4) As the austenitizing time under constant austenitizing temperature was long, hardness and impact toughness decreased.

목차 (Table of Contents)

• Ⅰ. 緖論
• Ⅱ. 試料 및 實驗方法
• Ⅱ-1. 試料
• Ⅱ-2. 試片의 熱處理
• Ⅱ-3. 機械的 性質試驗
• Ⅱ-4. 組織 檢査
• Ⅲ. 實驗結果 및 考察
• Ⅲ-1. Austenite化 溫度에 따른 機械的 性質
• Ⅲ-2. Tenlpering 溫度에 따른 機械的 性質
• Ⅲ-3. Austeniteg化 時間에 따른 機械的 性質 變化
• Ⅲ-4. 顯微鏡 組織
• Ⅳ. 結論