DZ22B高温合金与Al_2O_3陶瓷型壳的界面反应
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摘要
采用真空感应熔炼与惰性气体保护相结合,研究了不同熔炼温度及接触时间条件下DZ22B高温合金与Al_2O_3陶瓷型壳的界面反应发生及形成规律,探讨了界面反应对铸件表面粘砂缺陷的影响。结果表明,高温合金中Hf元素活性大,易与Al_2O_3发生界面反应,合金表面形成HfO_2。当接触15min后,界面反应随熔炼温度的提高而增强,在1 400℃时未出现界面反应,1 500℃时发生微弱界面反应,1 600℃时界面反应加剧,并出现粘砂现象。由于型壳面层中物理渗透层的形成以及应力集中的出现,界面反应的存在导致面层材料发生脱落,其中在接触30 min,浇注温度为1 600℃时粘砂最为严重,合金表面形成厚1mm的面层粘砂产物。
Using vacuum induction melting combined with inert gas protection,the occurrence and formation Law of the interfacial reaction between DZ22Bsuperalloy and Al_2O_3ceramic shell for investment casting were investigated with considering different melting temperature and contacted time.Moreover,the resultant surface sanding defect caused by interfacial reaction was also discussed.The results show that the Hf element in superalloys exhibits highly active,which is prone to react with Al_2O_3and the reaction product of HfO_2is formed on the casting surface.With the contacted time of 15min,the interfacial reaction is enhanced with the increase of melting temperature.It is found that absence of interfacial reaction occurs at 1 400℃,and weak interfacial reaction is formed at 1 500℃,and then serious reaction can be expected at 1 600℃,accompanied with the sand sticking phenomenon.Due to the formation of physical permeability layer and the presence of stress concentration,the surface layer of ceramic shell is inclined to fall out.Most serious reaction can be observed with the contacted time of 30min and melting temperature of 1 600℃,where the reaction zone with the size of 1mm is formed on the casting surface.
Using vacuum induction melting combined with inert gas protection,the occurrence and formation Law of the interfacial reaction between DZ22Bsuperalloy and Al_2O_3ceramic shell for investment casting were investigated with considering different melting temperature and contacted time.Moreover,the resultant surface sanding defect caused by interfacial reaction was also discussed.The results show that the Hf element in superalloys exhibits highly active,which is prone to react with Al_2O_3and the reaction product of HfO_2is formed on the casting surface.With the contacted time of 15min,the interfacial reaction is enhanced with the increase of melting temperature.It is found that absence of interfacial reaction occurs at 1 400℃,and weak interfacial reaction is formed at 1 500℃,and then serious reaction can be expected at 1 600℃,accompanied with the sand sticking phenomenon.Due to the formation of physical permeability layer and the presence of stress concentration,the surface layer of ceramic shell is inclined to fall out.Most serious reaction can be observed with the contacted time of 30min and melting temperature of 1 600℃,where the reaction zone with the size of 1mm is formed on the casting surface.
引文
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[15]姚建省,唐定中,刘晓光,等.DD6单晶高温合金与陶瓷型壳的界面反应[J].航空材料学报,2015,35(6):1-7.
[2]CHEN M H,SHEN M H,ZHU S L,et al.Comparative study of interfacial reaction between superalloy substrate and glass coating with and without alumina particles incorporation[J].Applied Surface Science,2013,271:228-233.
[3]张俊,黄嘉鹏,尚根峰,等.一种镍基定向凝固高温合金与陶瓷铸模的界面反应研究[J].铸造技术,2017,38(5):1 069-1 074.
[4]曹腊梅,汤鑫,张勇,等.先进高温合金近净形熔模精密铸造技术进展[J].航空材料学报,2006,26(3):238-243.
[5]谭黎明,贾建,张义文.合金元素对镍基粉末高温合金FGH97的强化作用[J].稀有金属材料与工程,2017,46(6):1 578-1 583.
[6]CHENG X,YUAN C,HOLT G,et al.Interactions between high Nb containing TiAl alloy and yttria facecoat during investment casting[J].International Journal of Cast Metals Research,2015,28(5):282-289.
[7]CUI Y W,FENG K,CHENG C,et al.Interaction between Ti-48Al alloy and coating materials during the solidification process[J].Rare Metal Materials and Engineering,2016,45(12):3 062-3 067.
[8]牛国宾,王东坡,杨振文,等.Al2O3陶瓷与TiAl合金真空钎焊接头界面组织及性能[J].稀有金属材料与工程,2017,46(11):3 282-3 287.
[9]姜卫国,王莉,刘鸣,等.1 600~1 620℃浇注温度下K441合金与模壳面层的界面反应[J].钢铁研究学报,2011,S23(2):442-445.
[10]郑亮,肖程波,张国庆,等.高Cr铸造镍基高温合金K4648与陶瓷型芯的界面反应研究[J].航空材料学报,2012,32(3):10-22.
[11]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.
[12]曾强,张德堂,马书伟,等.加Re新型单晶高温合金熔体与Al2O3型壳界面状况研究[J].材料工程,2001(5):20-22.
[13]宗毳,王丽丽,赵金乾,等.DZ22合金空心叶片内腔表面裂纹成因[J].失效分析与预防,2016,11(4):232-235.
[14]佘力,穆寿昌,殷克勤.DZ22B定向凝固高温合金长时组织稳定性的研究[J].材料工程,1997(8):35-37.
[15]姚建省,唐定中,刘晓光,等.DD6单晶高温合金与陶瓷型壳的界面反应[J].航空材料学报,2015,35(6):1-7.