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

• Main Authors: Liu min jiun, 劉
• Other Authors: K.M.Lin
• Format: Others
• Language: zh-TW
• Published: 2001
• Online Access: http://ndltd.ncl.edu.tw/handle/75501720349397322466

碩士 === 逢甲大學 === 材料科學學系 === 89 === 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. The erosion resistance of Fe-based alloys after TIG welding and ion nitriding. Respectively, is also investigated. Experimental results show that the erosion rate of Fe64Mn30Si6 is always greater than Fe59Mn30Si6Cr5 and SUS304 stainless steel in liquid/solid impingement test. The maximum of erosion rate occurs at impingement angle equaling to 300 for three alloys. The erosion rate increases with increasing impingement velocity. The impinged morphologies of Fe64Mn30Si6 ` Fe59Mn30Si6Cr5 and SUS304 stainless steel exhibit a lot of long and narrow furrows at low impingement angles, but the overlapped chips at high impingement angles. The work hardening at the impinged surface of three alloys fake places 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 phenomenon at the surfaces occurs for two Fe-base alloys but not for SUS304 stainless steel. After erosion test, the surface of the Fe-based alloys are locally attacked, but severely attacked and peeling-off of big area taking place for SUS304 stainless steel. The erosion resistance by liquid/solid impingement test is degraded after TIG welding, but approved by ion nitriding for the Fe-based alloys.