回火熱處理參數對M2高速鋼顯微組織之影響

The Effect of Tempering Heat Treatment on the Microstructure of M2 High-Speed Steel

彭元霖(Y. L. Peng) ； 林子堯(T. Y. Lin,) ； 黃聖堯(S. Y. Huang) ； 潘永村(Y. T. Pan) ； 林東毅(D. Y. Lin)

《鑛冶：中國鑛冶工程學會會刊》 58卷2期 (2014/06) Pp. 113-121

https://doi.org/10.30069/MM.201406_58(2).0006

摘要

本研究以AISI M2高速鋼作為研究材料，規劃出九種熱處理參數，期望觀察不同回火熱處理條件對顯微組織之影響，試圖利用金相腐蝕方法與影像分析軟體，進行相分率的定量分析，另外再配合FE-SEM和XRD進行微觀組織的觀察，而微觀組織觀察的重點為殘留沃斯田鐵與碳化物的改變。根據本實驗的研究結果顯示，碳化物的含量會隨著回火溫度的提高漸漸增加，在600℃三次回火後達到最高含量9.08%左右；殘留沃斯田鐵的定量分析結果則相反，在200℃和400℃回火三次後分別有24.73%與20.24%的殘留沃斯田鐵尚未消除，而在600℃第一次回火後殘留沃斯田鐵含量僅剩10.17%，在第三次的回火後則可降至5%以下。借助SEM與XRD的分析一樣可以觀察到相似的趨勢。

關鍵字

高速鋼 ； 回火 ； 殘留沃斯田鐵 ； 碳化物

並列摘要

This study focused on the microstructural change of AISI M2 high speed steel after different tempering treatments with 9 heat treatment parameters. This research attempted to quantify the volume fraction of retained austenite and carbide to check the change of microstructure right after each tempering condition. We analyzed the microstructure and phase using FE-SEM and XRD. Results showed that the carbide content increased gradually with the increasing tempering temperature. It reached the highest value, 9.08% when it was tempered at 600˚C for 3 times. The retained austenite decreased when tempered at a higher temperature. The retained austenite could not be eliminated efficiently at 200˚C and 400˚C; the amount of retained austenite was 24.73% and 20.24%, respectively. When it was tempered at 600˚C, the retained austenite content was reduced to 10.17%. After the 3rd tempering treatment at 600˚C, the amount of retained austenite was reduced to 5% or less. The analysis of SEM and XRD showed a similar result.

並列關鍵字

high speed steel ； tempering ； retained austenite ； carbide