沃斯回火與淬火回火對延性鑄鐵磨耗及腐蝕性質之影響

Effects of Austempering and Quenching/Tempering on Wear and Corrosion Properties of Ductile Iron

蔡安妮(A. N. Tsai) ； 許正勳(C. H. Hsu)

《鑄造工程學刊》 42卷3期 (2016/09) Pp. 1-6

摘要

本研究分別利用沃斯回火與淬火回火方式對延性鑄鐵進行熱處理以獲得不同的顯微組織，然後進行乾式磨耗及極化腐蝕試驗，用以探討顯微組織對延性鑄鐵磨耗及腐蝕行為之影響。實驗結果顯示：鑄態延性鑄鐵(DI)經沃斯回火為ADI組織，而經淬火回火為回火麻田散體(TM)組織。磨耗性質方面，因回火麻田散體組織具有較高硬度，因此摩擦係數最低，且耐磨耗順序為TM＞ADI＞DI；在3.5%NaCl溶液之腐蝕性質比較，ADI因具有殘留沃斯田體，其耐蝕性表現最好，依序為ADI＞DI＞TM。

關鍵字

延性鑄鐵 ； 沃斯回火 ； 淬火回火 ； 耐磨耗 ； 耐蝕性

並列摘要

In this study, the ductile iron (DI) was heat-treated via austempering and quenching/tempering methods to get the two types of ausferrite (ADI) and tempered martensite (TM) in microstructure. And then dry wear tests and polarization tests were conducted for exploring the effect of microstructure on wear and corrosion behavior of ductile iron. The experimental results showed that ductile iron after austempering and quenching/tempering treatments could be actually obtain the microstructures of both ADI and TM, separately. In the case of wear behavior, TM had the highest hardness and the lowest friction coefficient among the three irons. The order of wear resistance was TM＞ADI＞DI. In the case of corrosion behavior in 3.5%NaCl solution, ADI had the best corrosion resistance due to with retained austenite in microstructure. The order of wear resistance was ADI＞DI＞TM.

並列關鍵字

Ductile iron ； Austempering ； Quenching/tempering ； Wear resistance ； Corrosion resistance