对烧结态93W4.9Ni-2.1Fe合金进行不同变形量旋转锻造.研究变形量对钨合金微观组织及绝热剪切敏感性的影响.微观组织观察结果表明,旋转锻造形变后钨颗粒沿变形方向被拉长为椭球形,随变形量由3.45%增加至42.11%,钨颗粒变形程度加剧,长径比由1.32增加至2.41;位于钨颗粒间的粘结相则沿变形方向逐渐拉长为细长的条状组织.对不同变形量的旋转锻造钨合金,沿棒料径向取样进行动态压缩试验后发现:当变形量增加至15.84%(钨颗粒长径比1.47)时,旋转锻造钨合金塑性变形方式发生改变,合金中开始出现绝热剪切现象;此后,随旋转锻造变形量(钨颗粒长径比)的增加,旋转锻造钨合金中绝热剪切带宽度减小,合金绝热剪切敏感性增大.随旋转锻造变形量(钨颗粒长径比)的增大,合金应变硬化能力减小,同时动态加载时绝热温升数值增大,软化效应增强,这是旋转锻造钨合金绝热剪切敏感性随变形量(钨颗粒长径比)增加而增大的主要原因.
参考文献
| [1] | Bai Y;Dodd B.Adiabatic Shear Localization-Occurrence,The-ories and Application[M].Oxford:pergamon Press,1992 |
| [2] | Meyers M A.Dynamic Behavicv of Materials[M].New York:John Wiley and Sons,Inc,1994 |
| [3] | Wright T W .The Physics and Mathematics of Adiabatic Shear Bands[D].Cambridge:Cambridge University Preen,2002. |
| [4] | 张静,谭成文,刘新芹,王富耻,才鸿年.Ti-6Al-4V合金绝热剪切带的演化[J].稀有金属,2009(05):648-651. |
| [5] | Magness L S .High strain rate deformation behaviors of kinetic energy penetrator materials during ballistic impact[J].Mach Mater,1994,17:147. |
| [6] | Upadhyaya A. .Processing strategy for consolidating tungsten heavy alloys for ordnance applications[J].Materials Chemistry and Physics,2001(1/3):101-110. |
| [7] | 李英雷,胡时胜,魏志刚,史洪刚,冯宏伟.大变形锻造钨合金动态力学性能研究[J].兵工学报,2003(03):378-380. |
| [8] | Meyers MA;Nesterenko V.F. -;Chen YJ .Spontaneous and forced shear localization in high-strain-rate deformation of tantalum[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,1999(1/2):70-82. |
| [9] | Xue Q;Gray G T .Development of adiabatic shear bands in an-pealed 316L stainless steel:Part I.Correlation between evolving microstructure and mechanical behavior[J].Metallurgical and Materials Transactions,2007,37A:2435. |
| [10] | Xue Q;Cerreta EK;Gray GT .Microstructural characteristics of post-shear localization in cold-rolled 316L stainless steel[J].Acta materialia,2007(2):691-704. |
| [11] | 张朝晖,李能新,王富耻,李树奎,程荆卫.钨基高密度合金的静液挤压形变强化研究[J].稀有金属材料与工程,2005(03):493-496. |
| [12] | 于洋,王尔德,胡连喜.热液静挤压93W-4.9Ni-2.1Fe合金显微组织与力学性能[J].稀有金属材料与工程,2007(03):408-411. |
| [13] | 潘金生;全健民;田民波.材料科学基础[M].北京:清华大学出版社,1998 |
| [14] | Wei Q;Jiao T;Remesh K T;Ma E,Kecskes L J,Magnees L,Dowding R,Kazyhanov V U,Valiev R Z .Mechanical behavior end dynamic failure of high-strength ultrefine grained tungsten un-der uaiarial cwmpressim[J].Acta Materialia,2006,54:77. |
| [15] | Wei Q;Kecalres L J;Jieo T;Hamvig K T,Ramesh K T,Ma E .Adiabatic shear banding in ultrafine-grained Fe piooeeeed by se-vere plastic deformation[J].Acta Materialia,2004,52:1859. |
| [16] | Jia D;Ramesh K T;Ma E .Effects of nanocrystalline and ultra-fice grain sizes on constitutive behavior and shear bands in iron[J].Acta Materialia,2003,51:3495. |
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