回火熱處理對CA-15不銹鋼沖蝕麿耗之影響

Effect of Tempering on the Erosion Wear of CA-15 Stainless Steel

溫東成(Dong-Cherng Wen)

《中華技術學院學報》 31期 (2004/12) Pp. 237-245

https://doi.org/10.7095/JCIT.200412.0237

摘要

麻田散鐵系不鏽鋼具備優異強度、耐蝕性與耐磨耗特性，廣泛用於渦輪葉片與管件材料等場合，然而由於流場中所攜帶固體、微塵等物質藉著流動而撞擊材料，易造成材料產生固體沖蝕磨耗，嚴重時將導致破損而發生重大傷害。本研究探討CA-15麻田散鐵不誘鋼經調質熱處理後對材料組織與沖蝕磨耗行為之影響。結果顯示，最大沖蝕率發生在沖蝕角度30°時，最深沖蝕穿透發生於45°沖蝕時。在低角度沖蝕時，微切削是主要之破壞機制，而高角度沖蝕時，主要沖蝕機制則為變形凹坑。在反覆沖蝕過程中，不論是低或高角度沖蝕，表面與次表面裂痕均為沖蝕破壞的主要原因之一。經300-400℃調質處理，材料硬度強度雖增加，但由於回火麻田散鐵脆化(TME)造成晶界脆化，將明顯導致晶界產生沖蝕破裂。

關鍵字

麻田散鐵不鏽鋼 ； 固體顆粒沖蝕(SPE) ； 調質熱處理 ； 沖蝕機制

並列摘要

Martensite stainless steel (MSS) possesses excellent strength and medium corrosion resistance, and is often used in industrial applications, such as for highly stressed parts like turbine blades and pipe materials. However parts are often damaged by flow field particles interact with the materials, in a solid particle erosion (SPE) phenomenon, which may even lead to injuries. In this paper we discuss the effects of the tempering treatment and the erosion incident angle on the CA-15 MSS erosion behavior. The results show that, in single particle erosion tests, the main mechanisms that cause problems are micro-cutting and deformation craters at low and high incident angles, respectively. In repetitive particle erosion tests, grain boundary cracking is one of the main fracture mechanisms. The platelet mechanism also obvious affected at high incident angle erosion. Materials tempered at 300-400℃, tempered martensitic embrittlement (TME) occurred, which caused serious boundary cracking and grain broken-down. The serious erosion damage showed at medium incident angle for this material that result in combine of cutting, deformation crater, and cracking mechanism. The maximum erosion rate of material occurred at an incident angle of 30° and the deepest erosion penetration occurred at an incident angle of 45°.

並列關鍵字

Martensitic stainless steel ； Solid particle erosion ； Erosion mechanism