Strain-induced Martensitic Transformation of SUS304 Stainless Steel by Cavitation Micro-jet Impact

SUS 304不銹鋼之超音波空泡微噴流衝擊應變誘導麻田散鐵變態

陳永增(Yeong-Jern Chen)

《中國機械工程學刊》 30卷5期 (2009/10) Pp. 437-441

https://doi.org/10.29979/JCSME.200910.0010

摘要

本研究探討SUS304不銹鋼之超音波空泡微噴流衝擊應變誘導麻田散鐵變態。不銹鋼試片在水中以商用的超音波洗淨機加以震盪處理，過程中可在水中生成空泡，空泡經由成核、成長及爆破而產生微噴流衝擊在試片的表面上。微噴流的衝擊導致試片表面之沖蝕區產生塑性變形，試片沖蝕的表面經由肉眼或光學觀察可顯現霧狀的痕跡。突出的滑動帶或雙晶會發生在試片的沖蝕表面上，這些位置承受高變形應變是提供應變誘導麻田散鐵成核的位置。試片沖蝕的表面呈現展性破壞的模式，而且出現破損的凹洞。

並列摘要

This study investigates the strain-induced martensitic transformation of SU304 stainless steel by cavitation micro-jet impact during ultrasonic-vibration treatment in water. An ultrasonic cleaner equipped with a stainless steel vessel was used for the ultrasonic-vibration treatment. Cavitation bubbles generated by this treatment nucleated, grew and collapsed, generating micro-jets on the surface of the treated sample. The impact of these micro-jets on the sample surface induced plastic deformation in the eroded area. This eroded surface would show up as foggy marks via visual or optical observation. The protruding slip bands or twins that occurred on the eroded sample surface. Strain-induced martensite was nucleated at these shear bands or twins that had been subjected to high deformation strain. The eroded surface of the sample displayed a ductile fracture mode and damage pitting.

並列關鍵字

strain-induced martensite ； micro-jet SUS304 stainless steel ； ultrasonic-vibration treatment