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真空熱處理對(duì)微波燒結(jié)93W-Ni-Fe合金顯微組織及力學(xué)性能的影響
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國(guó)家自然科學(xué)基金（50774098）；國(guó)家基礎(chǔ)科研資助項(xiàng)目


Effects of Vacuum Heat Treatment on Microstructure and Mechanical Properties of 93W-Ni-Fe Alloy by Microwave Sintering
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    摘要:

    研究真空熱處理對(duì)微波燒結(jié)擠壓棒坯93W-Ni-Fe合金顯微組織及力學(xué)性能的影響，采用高倍SEM和光學(xué)金相分別對(duì)合金斷口和顯微組織進(jìn)行觀察，采用能譜分析儀對(duì)合金真空熱處理前后各元素含量進(jìn)行定量分析，并對(duì)真空熱處理樣的相對(duì)密度、抗拉強(qiáng)度、延伸率和硬度進(jìn)行測(cè)定和分析。結(jié)果表明：經(jīng)真空熱處理后，鎢合金的各項(xiàng)力學(xué)性能都得到了提高，抗拉強(qiáng)度和延伸率提高顯著，抗拉強(qiáng)度從920 MPa提高到了988 MPa，延伸率從9.7%提高到了18.6%；真空熱處理后，顯微組織中鎢晶粒的連接度降低，合金斷口中鎢晶粒的穿晶解理斷裂和粘結(jié)相的延性撕裂增多；真空熱處理后合金粘結(jié)相中的鎢含量明顯降低。

    Abstract:

    Effects of vacuum heat treatment on microstructure and mechanical properties of extruded rods of 93W-Ni-Fe alloy sintered by microwave were studied. Fracture morphology and microstructure were observed by SEM and optical microscope, respectively. Quantitative analysis of each element of the samples before and after vacuum heat treatment was performed by energy spectrum analyzer. Relative density, tensile strength, elongation and hardness of samples were measured. The results show that the mechanical properties of the tungsten-based alloy are increased after vacuum heat treatment. Tensile strength and elongation are improved markedly, which are increased from 920 MPa to 988 MPa and from 9.7% to 18.6%, respectively. After vacuum heat treatment connectivity of tungsten grains is reduced, and transgranular cleavage fracture of tungsten grains and ductile tearing of binding phase are increased evidently. The content of tungsten element in binding phase is obviously reduced after vacuum heat treatment.

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馬運(yùn)柱,張佳佳,劉文勝,賀柳青,蔡青山.真空熱處理對(duì)微波燒結(jié)93W-Ni-Fe合金顯微組織及力學(xué)性能的影響[J].稀有金屬材料與工程,2012,41(9):1680~1683.[Ma Yunzhu, Zhang Jiajia, Liu Wensheng, He Liuqing, Cai Qingshan. Effects of Vacuum Heat Treatment on Microstructure and Mechanical Properties of 93W-Ni-Fe Alloy by Microwave Sintering[J]. Rare Metal Materials and Engineering,2012,41(9):1680~1683.]
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  • 收稿日期:2011-09-15
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