鐵基形狀記憶合金抗沖蝕性之研究

A Study on Erosion Resistance of Fe-based Shape Memory Alloys

林昆明(K. M. Lin) ； 林新智(H. C. Lin) ； 劉珉（女勻）(M. J. Liu) ； 陳彥伸(Y. S. Chen) ； 周棟勝(T. S. Chou)

《材料科學與工程》 34卷1期 (2002/03) Pp. 27-36

https://doi.org/10.6409/JMSE.200203.0027

摘要

應用眞空感應熔煉法配製Fe64Mn30Si6和Fe59Mn30Si6Cr5二種合金，進行液固混合沖蝕及坑穴沖蝕試驗，並選擇SUS304不銹鋼做為比較材。實驗結果顯示，於液固混合沖蝕中，在一定沖擊速度下，Fe64Mn30Si6之沖蝕速率皆大於Fe59Mn30Si6Cr5和SUS304不銹鋼。於沖擊角為30度時，三種合金皆呈現沖蝕速率之極大值。沖蝕速率也隨沖擊速度增加而遞增。三種材料經沖蝕後之表面顯微組織，隨沖擊角度之增加，其沖蝕型態皆由狹長犁溝流線痕跡逐漸轉變為突起屑片重疊覆蓋的趨勢。三種合金經沖蝕後皆呈現加工硬化現象，此現象隨著沖擊角度之提高而愈加明顯。於坑穴沖蝕中，二種鐵基合金之重量損失僅為SUS304不銹鋼之一半，顯示較優之抗沖蝕性。靶材重量損失愈大者，其表面平均粗度值也愈大。坑穴沖蝕後，三種合金均產生明顯的加工硬化現象。沖蝕後的合金表面，二種鐵基合金均呈局部損傷之型態，而SUS304不銹鋼則呈現大面積之剝落現象，且伴隨局部之深陷孔洞。

關鍵字

鐵基形狀記憶合金 ； 液固混合沖蝕 ； 坑穴沖蝕

並列摘要

Both Fe64Mn30Si6 and Fe59Mn30Si6Cr5 shape memory alloys are prepared by VIM technique. Their erosion characteristics have been systematically studied using cavitation erosion and liquid/solid impingement tests. SUS304 stainless steel is selected to compare its erosion characteristics with Fe-based alloys. Experimental results show that the erosion rate of Fe64Mn30Si6 is always greater than Fe59Mn30Si6Cr5 and SUS304 stainless steel in the liquid/solid impingement test. The maximum of erosion rate occurs at the impingement angle equaling to 30° for three alloys. The erosion rate increases with increasing impingement velocity. The impinged surface morphologies of Fe64Mn30Si6, Fe59Mn30Si6Cr5 and SUS304 stainless steel all exhibit a lot of long and narrow furrows at lower impingement angles, but the overlapped chips at higher impingement angles. The work hardening at the impinged surfaces of three alloys takes place and increases with impingement angle. In cavitation erosion, the Fe-based alloys exhibit an excellent erosion resistance better than SUS304 stainless steel. The work hardening at the surfaces occurs for three alloys. After erosion test, the surfaces of the Fe-based alloys are only locally attacked, but severely attacked and peeling-off of big area taking place for SUS304 stainless steel.

並列關鍵字

Fe-based shape memory alloy ； Liquid/solid impingement ； Cavitation erosion