廖晓航,司家勇,宋思远,谢利强

• 1:中南林业科技大学机电工程学院

摘要(Abstract)：

对经δ相时效处理(DP)后的Inconel 718合金中δ相的静态溶解行为进行了研究,分析了不同热处理温度和保温时间下δ相含量、晶粒尺寸和硬度变化,发现了δ相在静态溶解过程中的组织和性能演变规律。结果表明:静态溶解过程中针状δ相形貌特征变化可分为两个阶段,初期主要为长针状δ相溶解成为短针状乃至球状,后期主要是短针状δ相溶解成球状及部分球状δ相;随着保温时间的延长,δ相的溶解量与保温时间的关系由溶解初期的线性关系变为溶解后期的近似抛物线关系,溶解速度逐渐降低;在950、980和1000℃时,δ相的溶解量在保温一段时间后达到稳定值,而在温度为1020℃和1060℃时,δ相可持续溶解,最终完全溶解;溶解初期δ相体积分数的迅速降低是界面反应起主要作用,溶解后期主要是受扩散过程控制;δ相溶解初期,硬度值下降较快,后期趋于稳定;随着保温时间的延长,热处理温度的提高,硬度值不断降低。

关键词(KeyWords)： DP处理工艺;Inconel 718合金;δ相;静态溶解;硬度

Abstract:

Keywords:

基金项目(Foundation): 国家“863”计划项目(2012AA03A514);; 湖南省高校科技创新团队支持计划资助

作者(Author): 廖晓航,司家勇,宋思远,谢利强

DOI: 10.13289/j.issn.1009-6264.2016.08.001

参考文献(References)：

• [1]Krueger D D.The development of direct age 718 for gas turbine aging disk applications[C]//Loria E A.Superalloy 718-Metallurgy and Applications.Warrendale,PA:TMS,1989:279-296.
• [2]Connolley T,Reed P A S,Starink M J.Short crack initiation and growth at 600℃in notched specimens of Inconel 718[J].Materials Science and Engineering A,2003,340(1/2):139-154.
• [3]Lu H J,Jia X C,Zhang K F,et al.Fine-grained pretreatment process and superplasticity for Inconel 718 superalloy[J].Materials Science and Engineering A,2002,326(2):382-385.
• [4]李树祺,庄景云,谢锡善,等.GH169合金显微组织对合金裂纹扩展速率的影响[J].材料工程,1998(5):26-27.LI Shu-qi,ZHUANG Jing-yun,XIE Xi-shan,et al.Effcet of microstructutes on crack propagation rate of GH167 alloy[J].Journal of Materials Engineering,1998(5):26-27.
• [5]Pieraggi B,Uginet J F.Fatigue and creep properties in relation with alloy718 microstructure[C]//Loria E A.Superalloys 718,625,706 and Various Derivatives.Warrendale,PA:TMS,1994:535-544.
• [6]Li S Q,Zhuang J Y,Yang J Y,et al.The effect ofδphase on crack propagation under creep and fatigue conditions in alloy 718[C]//Loria E A.Superalloys 718,625,706 and Various Derivatives.Warrendale,PA:TMS,1994:545-555.
• [7]Aaron H B,Kotler G R.Second phase dissolution[J].Metallurgical Transactions,1971,2(2):393-408.
• [8]Zhang R,Cao Q F,Pang S,et al.Dissolution kinetics of primary silicon in hypereutectic Al-Si melt[J].Science and Technology of Advanced Materials,2001,2(1):3-5.
• [9]张尚洲.碳对Ti-60高温钛合金组织演变的影响[D].沈阳:中国科学院金属研究所,2004:16-19.
• [10]张蓉,曹秋芳,庞述先,等.Al-Si过共晶合金中初生硅的溶解动力学[J].中国有色金属学报,2000,10(1):89-91.ZHANG Rong,CAO Qiu-fang,PANG Shu-xian,et al.Dissolution kinetics of primary silicon for hypereutecetic Al-Si alloy[J].The Chinese Journal of Nonferrous Metals,2000,10(1):89-91.
• [11]Kashyap B P,Chaturvedi M C.Activation energy for superplastic deformation of IN718 superalloy[J].Scripta Materialia,2000,43(5):429-433.
• [12]胡荣祖,史启祯.热分析动力学[M].北京:科学出版社,2001:1-8.
• [13]戈晓岚,洪琢,钟利萍,等.机械工程材料[M].北京:北京大学出版社,2008.
• [14]蔡大勇,张伟红,刘文昌,等.Inconel 718合金中δ相的溶解行为[J].钢铁研究学报,2002,14(6):61-64.CAI Da-yong,ZHANG Wei-hong,LIU Wen-chang,et al.Dissolutin behavior of phaseδin Inconel 718[J].Journal of Iron and Steel Research,2002,14(6):61-64.
• [15]Oriani R A.Ostwald ripening of precipitates in solid matrices[J].Acta Metall,1964,12(12):393-408.
• [16]Zhang R,Cao Q F,Pang S X,et al.Dissolution kinetics of primary silicon in hypereutectic Al-Si melt[J].Science and Technology of Advanced Materials,2001,2(1):3-5.

文章评论(Comment)：