Two cooling schemes (continuous cooling and interrupted cooling tests) were applied to investigate the cooling γ precipitation behavior in powder metallurgy superalloy FGH4096.The effect of cooling rate on cooling γ precipitation and the development of γ precipitates during cooling process were involved in this study.The ultimate tensile strength (UTS) of the specimens in various cooling circumstances was tested.The experiential equations were obtained between the average sizes of secondary and tertiary γ precipitates,the strength,and cooling rate.The results show that they are inversely correlated with the cooling rate as well as the grain boundary changes from serrated to straight,the shape of secondary γ precipitates changes from irregular cuboidal to spherical,while the formed tertiary γ precipitates are always spherical.The interrupted cooling tests show that the average size of secondary γ precipitates increases as a linear function of interrupt temperature for a fixed cooling rate of 24℃/min.The strength first decreases and then increases against interrupt temperature,which is fundamentally caused by the multistage nucleation of γ precipitates during cooling process.
参考文献
| [1] | Cadel E;Lemarchand S;Chambreland S;Blavette D .Atom probe tomographgy investigation of the microstructure of superalloys N 18[J].Acta Materials,2002,50:957. |
| [2] | Agnieszka M. Wusatowska-Sarnek;Martin J. Blackburn;Mark Aindow .Techniques for microstructural characterization of powder-processed nickel-based superalloys[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2003(1/2):390-395. |
| [3] | Huda Z .Development of heat-treatment process for a P/M superalloy for turbine blades[J].Materials & Design,2006,28:1664. |
| [4] | Klepser C A .Effect of continuous cooling rote on the precipitation of gamma prime in nickel-based superalloys[J].Scripta Metallurgica et Materialia,1995,33:589. |
| [5] | Furrer D U;Fecht H J .γ formation in superalloy U720LI[J].Scripta Metallurgica et Materialia,1999,40:1215. |
| [6] | Wlodek S T;Kelly M;Alden D A.The structure of Rene 88DT[A].TMS,1996:129. |
| [7] | 何峰,汪武祥,杨万宏,邹金文,王旭青,韩雅芳.FGH95合金连续冷却条件下γ′相析出过程的研究[J].航空材料学报,2000(01):22-26. |
| [8] | Mao J;Chang K M;Yang W H;Furrer D U,Ray K,Vaze S P .Cooling precipitation and strengthening study in powder metallurgy superalloy U720LI[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,2001,32A:2441. |
| [9] | Mao J.;Chang KM.;Yang WH.;Furrer DU.;Ray K.;Vaze SP. .Cooling precipitation and strengthening study in powder metallurgy superalloy Rene88DT[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2002(1/2):318-329. |
| [10] | 田高峰,贾成厂,刘建涛,胡本芙.固溶冷却介质对FGH96合金γ'相和性能的影响[J].材料工程,2006(12):24-27. |
| [11] | Liu J T .Investigation on Hot Working Behavior of Powder Metallurgy FGH96 Superalloy for Dual Microstructure Turbine Disc of Advanced Aeroengine[D].北京:北京科技大学,2005. |
| [12] | Reed, RC;Jackson, MP .Heat treatment of UDIMET 720Li: the effect of microstructure on properties[J].Materials Science & Engineering. A, Structural Materials: Properties, Microstructure and Processing,1999(1):85-97. |
| [13] | 田高峰,贾成厂,温莹,刘国权,胡本芙.粉末高温合金涡轮盘不同部位冷却γ'相的析出和强化[J].材料热处理学报,2008(03):126-130. |
| [14] | Safari J;Nategh S .On the heat treatment of Rene-80 nickel-base superalloy[J].Journal of Materials Processing Technology,2006,176:240. |
| [15] | Furrer D U.The evolution of microstructure during processing of Alloy-720[A].上海,2007:192. |
| [16] | Qiu YY. .The splitting behavior of gamma ' particles in Ni-based alloys[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,1998(1/2):145-153. |
| [17] | Doi M;Miyazaki T;Wakatsuki T .The effects of elastic interaction energy on the morphology of γ precipitates in Nickel-base alloys[J].Materials Science and Engineering,1984,67:247. |
| [18] | Doi M;Miyazaki T;Wakatsuki T .The effects of elastic interaction energy on the γ precipitate morphology of continuously cooled Nickel-base alloys[J].Materials Science and Engineering,1985,74:139. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%