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三種不同粒徑分布的Ti-6Al-4VELI球形粉末熱等靜壓件的顯微組織及力學性能
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西北有色金屬研究院鈦合金研究所,西北有色金屬研究院鈦合金研究所,西北有色金屬研究院鈦合金研究所,西北有色金屬研究院鈦合金研究所,,,

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Microstructure and mechanical properties of Hot Isostatically Pressed with three different diameter distributions of Ti-6Al-4VELI alloy spherical powders
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Northwest Institute for Nonferrous Metal Research,,,,,,

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    摘要:

    我們研究了經(jīng)等離子旋轉電極法制備的三種不同粒徑分布的Ti-6Al-4VELI(低間隙)合金球形粉末經(jīng)熱等靜壓工藝制件后的顯微組織和力學性能。Ti-6Al-4VELI合金球形粉末經(jīng)940℃及120MPa同時升溫升壓的熱等靜壓工藝制件。利用光學顯微鏡(OM),掃描電子顯微鏡(SEM)及能譜儀(EDS)可觀察到HIP制件中的α+β混合相。研究結果表明,Ti-6Al-4VELI合金球形粉末經(jīng)熱等靜壓制件后的顯微組織與粉末粒徑分布有很大關系。與Ti-6Al-4VELI合金中粉(粒徑分布范圍：100μm~150μm)及粗粉(粒徑分布范圍：150μm~250μm)制成的熱等靜壓件相比,由Ti-6Al-4VELI合金細粉(粒徑分布范圍：45μm~100μm)制成的熱等靜壓件呈現(xiàn)出更為優(yōu)異的顯微組織及力學性能,表現(xiàn)為更為細化的顯微組織和更高的抗拉強度及延伸率,與粉末熱等靜壓制件的顯微斷口分析結果相一致。

    Abstract:

    We report the microstructural and mechanical analysis of Ti-6Al-4VELI (Extra Low Interstitial) alloy parts fabricated with three diameter distributions of Ti-6Al-4VELI spherical powders by Hot Isostatic Pressing (HIP), which were manufactured via plasma rotating electrode processing (PREP). The powders were canned and pressed at temperatures 940℃ and pressure 120MPa. Alpha-beta mixed phases in the specimens were observed through Optical Microscope (OM), Scanning Electron Microscopy (SEM) and Energy Dispersive Spectroscopy (EDS) methods, respectively. The results show the microstructures of specimens were found to be strongly dependent on the different distributions of powders. The samples formed from fine powders (particle size range from 45μm to 100μm) shows better microstructure properties to those formed from medium powders (particle size range from 100μm to 150μm) and coarse powders (particle size range from 150μm to 250μm). In addition, the billets formed from fine powders exhibited higher tensile strength and ductility than those formed via medium powders and coarse powders. These results were attributed to the initial microstructures of HIP samples, as confirmed by evaluating their fracture features

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曾光,毛小南,趙永慶,黃朝文,梁書錦,韓志宇,閆飛.三種不同粒徑分布的Ti-6Al-4VELI球形粉末熱等靜壓件的顯微組織及力學性能[J].稀有金屬材料與工程,2017,46(11):3197~3203.[Zeng Guang, Mao Xiaonan, Zhao Yongqing, Huang Chaowen, Liang Shujin, Han Zhiyu, Yan Fei. Microstructure and mechanical properties of Hot Isostatically Pressed with three different diameter distributions of Ti-6Al-4VELI alloy spherical powders[J]. Rare Metal Materials and Engineering,2017,46(11):3197~3203.]
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  • 收稿日期:2017-03-08
  • 最后修改日期:2017-06-06
  • 錄用日期:2017-07-20
  • 在線發(fā)布日期: 2017-12-13
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