EDM和ESM孔对DD32单晶高温合金持久性能的影响  

Effect of EDM and ESM Holes on Stress Rupture Properties of DD32 Single Crystal Superalloy

作　　者：江帆 于金江[1] 娄建新[1] 谢君[1] 孙晓峰[1] JIANG Fan;YU Jin-jiang;LOU Jian-xin;XIE Jan;SUN Xiao-feng(Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,Liaoning,China;Aeroengine Office of Naval Military Representation Quarter at Guiyang Region,Guiyang 550014,Guizhou,China)

机构地区：[1]中国科学院金属研究所,辽宁沈阳110016 [2]海军驻贵阳地区军事代表办事处航空发动机办公室,贵州贵阳550014

出　　处：《铸造》2018年第11期951-954,960,共5页Foundry

基　　金：国家自然基金项目(51571196;51771191);国家青年自然基金项目(51701212)

摘　　要：研究了EDM和ESM加工孔对DD32单晶合金在1 000℃/280 MPa条件下持久性能的影响。结果表明,两种电加工方式均降低合金的持久性能,特别是明显降低持久伸长率。ESM孔试样的持久寿命和持久伸长率都优于EDM孔试样。EDM加工孔内表面要比ESM加工孔内表面氧化程度更高,且ESM孔内表面相对于EDM孔内表面更加密实和光滑。但是,ESM孔和EDM孔内表面都有30μm左右的反应层。多源裂纹在EDM或ESM加工孔周围萌生,并在持久变形过程中向基体内部扩展。The effects of EDM and ESM holes on stress rupture properties of DD32 single crystal superalloy at 1 000℃ and 280 MPa were researched. The results show that EDM and ESM evidently depress the stress rupture properties of the superalloy and especially debase the stress rupture ductility of the single crystal samples. The stress rupture life and durable elongation of the samples with ESM holes are both obviously greater than those of the samples with EDM holes. The surfaces of holes machined by EDM are oxidized much severely than those by ESM. However, the surfaces of holes machined by ESM are more compact and slippery, and the roughness of the hole surfaces is better. The resolidified layers or conversion zones of about 30 μm thick are exhibited at the surfaces of the holes machined by EDM or ESM process. The cracks nucleate and develop around the EDM or ESM holes because many micro-cracks can be observed around those holes.

关 键 词：电火花加工 电液束加工 持久性能 单晶高温合金 

分 类 号：TG142.1[一般工业技术—材料科学与工程]