DZ125合金涡轮叶片表面点状缺陷分析
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摘要
利用扫描电镜(SEM)及其附带的X射线能谱仪分析了DZ125合金叶片表面"墨点"缺陷分布区域和类型,发现夹杂物主要分布在叶背上,且缺陷由三种类型的氧化物构成:第一种为HfO_2,第二种为Al_2O_3,第三种为SiO_2。产生墨点缺陷的原因有二:一是DZ125合金中含有的活泼元素Hf在高温下与型壳材料发生反应;二是型砂中碱金属氧化物超标。
The distribution areas and types of'ink dot'defects on the surface of turbine blades casted by DZ125 Lalloy were analyzed by SEM with EDS.It was found that the inclusions are mainly distributed on the back of the blades,and the defects are composed of three types of oxides:the first is HfO_2,the second is Al_2O_3,and the third is SiO_2.Two reasons for the formation of 'ink dot'defects were found.Firstly,the active element Hf in DZ125 alloy reacts with shell materials at elevated temperature;Secondly,the alkaline metal oxide in molding sand is over standard.
The distribution areas and types of'ink dot'defects on the surface of turbine blades casted by DZ125 Lalloy were analyzed by SEM with EDS.It was found that the inclusions are mainly distributed on the back of the blades,and the defects are composed of three types of oxides:the first is HfO_2,the second is Al_2O_3,and the third is SiO_2.Two reasons for the formation of 'ink dot'defects were found.Firstly,the active element Hf in DZ125 alloy reacts with shell materials at elevated temperature;Secondly,the alkaline metal oxide in molding sand is over standard.
引文
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[2]张卫国,刘林,赵新宝,等.定向凝固高温合金的研究进展[J].铸造,2009,58(1):1-6.
[3]颜鸣.中国航空材料手册:第2卷[M].北京:中国标准出版社,2002:771-784.
[4]陈荣章,佘力,张宏炜,等.DZ125定向凝固高温合金的研究[J].航空材料学报,2000,(4).
[5]张华霞,吴昌新,桂忠楼.纯净化DZ125合金返回料研究[J].材料工程,2009,(8):68-70.
[6]佘力,陈荣章,王涛.定向凝固铸造高温合金DZ125热处理工艺的研究[J].材料热处理学报,2002,23(4):13-15.
[7] Yang X,Dong C,Shi D,et al.Experimental investigation on both low cycle fatigue and fracture behavior of DZ125base metal and the brazed joint at elevated temperature[J].Materials Science and Engineering:A,2011,528(22):7 005-7011.
[8]闵志先,沈军,熊义龙,等.高温度梯度定向凝固镍基高温合金DZ125的组织演化[J].金属学报,2011,47(4):397-402.
[9]郭勇冠,李双明,刘林,等.DZ125高温合金定向凝固微观组织的CA法模拟[J].金属学报,2008,44(3):365-370.
[10] Brain I.Thermochemical data of pure substances[M].Germany:Wiley-VCH VERLAG GMBH&CO.KGAA 1995.
[11] Valenza F,Muolo M L,Passerone A.Wetting and interactions of Ni-and Co-based superalloys with different ceramic materials[J].Journal of materials science,2010,45(8):2071-2 079.
[12]王丽丽,李嘉荣,唐定中,等.SiO2-ZrO2陶瓷型芯与DZ125,DD5和DD6三种铸造高温合金的界面反应[J].材料工程,2016,44(3):9-14.
[13]王斌,董茵,赵剑恒,等.DZ125合金涡轮叶片表面夹杂物研究[J].有色矿冶,2017,33(2):24-28.