,1368 北京科技大学学报 第30卷 100μm 4 um 100μm (e) 4 um 5 um 20 um 图3试样在不同状态下的组织形貌.(a)烧结试样微观组织;(b)烧结试样晶界形貌:(c)热处理试样微观组织:()热处理试样晶界形 貌:(©)热处理试样晶内析出相:(任)热处理试样拉伸断口形貌 Fig.3 Microstructures of samples in different conditions:(a)microstructure of the sintered sample:(b)grain boundary microstructure of the sin- tered sample:(e)microstructure of the treated sample:(d)grain boundary microstructure of the treated sample:(e)precipitate of the treated sam- ple:(f)tensile fracture microstructure of the treated sample 全热处理后,晶粒没有长大(见图3(c),晶界的组 [3]Dong J X.Development of Inconel 718 superalloy.Ordnance 织得到改善(见图3(d)),晶内析出了两种大小的 Mater Sci Eng.1996.19(2):46 (董建新.Inconel718高温合金的发展.兵器材料科学与工程, Ni3(Ti,Al,Nb)相,使得合金的强度有了显著提高, 1996,19(2):46) 图3(f)是热处理试样室温拉伸后的断口形貌照片· [4]Rao Appa G.Srinivas M,Sarma D S.Influence of modified pro- 可以看出,拉伸过程中产生了大量的韧窝,表现为韧 cessing on structure and properties of hot isostatically pressed su- 性断裂,在韧窝底部可以看到粗大的Ni3(Ti,Al, peralloy Inconel 718.Mater Sci Eng A.2006.418(1):282 Nb)相,说明在断裂前这些Ni3(Ti,Al,Nb)粒子阻碍 [5]Huang Q R.Li H K.Superalloys.Beijing:Metallurgical Indus- try Press.2000:134 了位错的运动 (黄乾尧,李汉康.高温合金.北京:治金工业出版社,2000: 3结论 134) [6]Zhang W Y,Shangguan Y H.Research and development in P/M 利用超固相线液相法可以制备出相对密度为 superalloy:Powder Metall Ind.2004.14(6):30 98.5%的Inconel718粉末高温合金,后续热等静压 (张义文,上官永恒.粉末高温合金的研究与发展.粉末治金 处理可以将致密度提高到99.7%,合金抗拉强度为 工业,2004,14(6):30) 1280MPa,平均晶粒尺寸在50m以下.该研究为 [7]Zen D L,Zhang HQ.Supersolidus liquid phase sintering.Pow- der Metall Ind.1995.6(1):6 Inconel7l8合金的净近形制备工艺提供了基础. (曾德麟,张怀泉.超固相液相烧结.粉末治金工业,1995,6 (1).6) 参考文献 [8]Lal A.lacocca R G,German R M.Microstructural evolution [1]Azadian S.Wei L Y.Warren R.Delta phase precipitation inIn- during the supersolidus liquid phase sintering of nickel-based preal- conel 718.Mater Charact,2004.53(1):7 loyed powder mixture.J Mater Sci.2000.35(18):4507 [2]Rao Appa C.Srinivas M.Sarma DS.Effect of thermomechani- [9]German R M.Supersolidus liquid phase sintering:I.Process re cal working on the microst ructure and mechanical properties of hot view.Int J Powder.1990.26(1):23 isostatically pressed superalloy Incone 718.Mater Sci Eng A, [10] German R M.Supersolidus liquid phase sintering:II.Densifi- 2004,383(2):201 cation theory.Int J Powder.1990,26(1):35图3 试样在不同状态下的组织形貌.(a) 烧结试样微观组织;(b) 烧结试样晶界形貌;(c) 热处理试样微观组织;(d) 热处理试样晶界形 貌;(e) 热处理试样晶内析出相;(f) 热处理试样拉伸断口形貌 Fig.3 Microstructures of samples in different conditions:(a) microstructure of the sintered sample;(b) grain boundary microstructure of the sintered sample;(c) microstructure of the treated sample;(d) grain boundary microstructure of the treated sample;(e) precipitate of the treated sample;(f) tensile fracture microstructure of the treated sample 全热处理后晶粒没有长大(见图3(c))晶界的组 织得到改善(见图3(d))晶内析出了两种大小的 Ni3(TiAlNb)相使得合金的强度有了显著提高. 图3(f)是热处理试样室温拉伸后的断口形貌照片. 可以看出拉伸过程中产生了大量的韧窝表现为韧 性断裂在韧窝底部可以看到粗大的 Ni3(TiAl Nb)相说明在断裂前这些 Ni3(TiAlNb)粒子阻碍 了位错的运动. 3 结论 利用超固相线液相法可以制备出相对密度为 98∙5%的 Inconel718粉末高温合金后续热等静压 处理可以将致密度提高到99∙7%合金抗拉强度为 1280MPa平均晶粒尺寸在50μm 以下.该研究为 Inconel718合金的净近形制备工艺提供了基础. 参 考 文 献 [1] Azadian SWei L YWarren R.Delta phase precipitation in Inconel718.Mater Charact200453(1):7 [2] Rao Appa GSrinivas MSarma D S.Effect of thermomechanical working on the microstructure and mechanical properties of hot isostatically pressed superalloy Inconel 718. Mater Sci Eng A 2004383(2):201 [3] Dong J X.Development of Inconel 718 superalloy. Ordnance Mater Sci Eng199619(2):46 (董建新.Inconel718高温合金的发展.兵器材料科学与工程 199619(2):46) [4] Rao Appa GSrinivas MSarma D S.Influence of modified processing on structure and properties of hot isostatically pressed superalloy Inconel718.Mater Sci Eng A2006418(1):282 [5] Huang Q RLi H K.Superalloys.Beijing:Metallurgical Industry Press2000:134 (黄乾尧李汉康.高温合金.北京:冶金工业出版社2000: 134) [6] Zhang W YShangguan Y H.Research and development in P/M superalloy.Pow der Metall Ind200414(6):30 (张义文上官永恒.粉末高温合金的研究与发展.粉末冶金 工业200414(6):30) [7] Zen D LZhang H Q.Supersolidus liquid phase sintering.Powder Metall Ind19956(1):6 (曾德麟张怀泉.超固相液相烧结.粉末冶金工业19956 (1):6) [8] Lal AIacocca R GGerman R M.Microstructural evolution during the supersolidus liquid phase sintering of nicke-l based prealloyed powder mixture.J Mater Sci200035(18):4507 [9] German R M.Supersolidus liquid phase sintering:Ⅰ.Process review.Int J Pow der199026(1):23 [10] German R M.Supersolidus liquid phase sintering:Ⅱ.Densification theory.Int J Pow der199026(1):35 ·1368· 北 京 科 技 大 学 学 报 第30卷