研究了镍基GH738高温合金经两种热处理后分别在550、750、800和850℃下,时效0～ 4500 h后γ'强化相形貌与硬度性能之间的关联性.结果表明,在长期时效过程中,经两种热处理后,γ'强化相随温度升高和时间延长而长大,但温度比时间影响更明显；γ'相粗化速率随着时效温度的升高和γ'相初始尺寸的增大而增大；γ'相的粗化符合L-S-W熟化理论；长期时效中γ'相的长大初期粗化速率较高；经过550℃长期时效后组织及性能几乎没有变化,表明合金在该温度下具有良好的组织稳定性；同时获得两种热处理后长期时效γ'相长大激活能；两种热处理制度下,时效硬度随温度变化大致呈下降趋势,亚固溶热处理后合金时效硬度明显高于过固溶热处理后的硬度；同时发现在750、800和850℃温度下,随着温度升高合金强化相的数量逐渐降低,从而导致合金强化相体积分数的降低.
参考文献
| [1] | 姚志浩,董建新,张麦仓.GH738高温合金热变形过程显微组织控制与预测Ⅰ.组织演化模型的构建[J].金属学报,2011(12):1581-1590. |
| [2] | 姚志浩,董建新,张麦仓,于秋颖,郑磊.固溶温度对GH864合金组织性能的影响[J].材料热处理学报,2011(07):44-50. |
| [3] | Lerch B A;Jayaraman N .A study of fatigue damage mechanisms in WASPALOY from 25 to 800 ℃[J].Materials Science and Engineering,1984,66:151-166. |
| [4] | Penkalla HJ.;Wosik J.;Czyrska-Filemonowicz A. .Quantitative microstructural characterisation of Ni-base superalloys[J].Materials Chemistry and Physics,2003(2/3):417-423. |
| [5] | 姚志浩,董建新,张麦仓,郑磊.GH864合金显微组织与力学性能的关联性[J].稀有金属材料与工程,2010(09):1565-1570. |
| [6] | Rehrer W P;Muzyka D R;Heydt G B .Solution treatment and Al + Ti effects on the structure and tensile properties of WASPALOY[J].Journal of Metals,1970,22:32-38. |
| [7] | C. M. F. RAE;R. C. REED .THE PRECIPITATION OF TOPOLOGICALLY CLOSE-PACKED PHASES IN RHENIUM-CONTAINING SUPERALLOYS[J].Acta materialia,2001(19):4113-4125. |
| [8] | 姚志浩,董建新,张麦仓,于秋颖.GH864合金870℃高温时效过程中强化相的退变[J].材料热处理学报,2011(10):43-49. |
| [9] | V. Siva Kumar G. Kelekanjeri;Rosario A. Gerhardt .Characterization of microstructural fluctuations in Waspaloy exposed to 760℃ for times up to 2500 h[J].Electrochimica Acta,2006(8/9):1873-1880. |
| [10] | 赵双群,谢锡善.WASPALOY合金长期时效过程中的组织演变和性能变化[J].机械工程材料,2006(10):62-65. |
| [11] | 宋西平,李红宇,盖靖峰,陈国良.U720LI合金高温析出γ′相的失稳分解[J].金属学报,2005(11):1233-1236. |
| [12] | Yeom S J;Yoon D Y;Henry M F .The morphological changes of γ' precipitates in a Ni-8Al alloy during their coarsening[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,1993,24:1975. |
| [13] | S.A. Sajjadi;H.R. Elahifar;H. Farhangi .Effects of cooling rate on the microstructure and mechanical properties of the Ni-base superalloy UDIMET 500[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,2008(1/2):215-220. |
| [14] | 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. |
| [15] | Shuangqun Zhao;Xishan Xie;Gaylord D. Smith .Gamma prime coarsening and age-hardening behaviors in a new nickel base superalloy[J].Materials Letters,2004(11):1784-1787. |
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