含銅1.28%沃斯回火球墨鑄鐵的破裂韌性

The Fracture Toughness of 1.28%Cu Austempered Ductile Iron

溫東成(Dong-Cherng Wen)

《中華技術學院學報》 23期 (2001/09) Pp. 135-144

https://doi.org/10.7095/JCIT.200109.0135

摘要

本研究探討含銅1.28%球墨鑄鐵在260、315、355與400℃四個溫度等級沃斯回火後的機械性質，並比較這四個等級的最佳衝擊韌性與其破裂韌性。實驗結果顯示機械性質中以衝擊韌性和伸長率最能反映沃斯回火的變態特性，最佳衝擊韌性的沃斯回火時間隨沃斯回火溫度增加而減少，在400℃等級為120分鐘，其他三個等級則為210分鐘。數據顯示破裂韌性和衝擊韌性間有密切關係，其中K(下標 1C)與J(下標 1C)和衝擊韌性的變化趨勢一致，而用以判斷不同強度下材料韌性等級的韌性指標值（K(下標 1C)/σ(下標 ys)）則隨沃斯回火溫度增加而增加。

關鍵字

沃斯回火球墨鑄織 ； 機械性質 ； 破裂韌性

並列摘要

The mechanical properties of 1.28% Cu-ductile irons austempering of 260, 315, 355 and 400°C were studied. Then, the fracture toughness was compared with the highest value of impact toughness of those specimens.The result show that the elongation and impact roughness had better reflection of the microstructure changes than strength and hardness. The austempering time of specimens with the highest value of impact toughness, 120 min for 400°C and 210 min for others, increased with decreasing in austempering temperature. The data also show that the variations of K(subscript 1C) and J(subscript 1C) were coincided with the change of impact toughness. But the fracture toughness index (K(subscript 1C)/σ(subscript ys)) increased with increasing in austempering temperature.

並列關鍵字

Austempered ductile iron ； mechanical properties ； fracture toughness