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微波燒結(jié)工藝對(duì)鎢基合金擠壓棒坯顯微組織及力學(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)科研基金


Effect of Microwave Sintering Parameters on Microstructure and Mechanical Properties of Powder Extruded Rods of Tungsten-Based Alloy
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    摘要:

    研究了微波燒結(jié)溫度和時(shí)間對(duì)鎢基合金擠壓棒坯顯微組織及力學(xué)性能的影響。采用高倍SEM和光學(xué)金相顯微鏡分別對(duì)合金斷口和顯微組織進(jìn)行了形貌觀察；對(duì)合金相對(duì)密度、抗拉強(qiáng)度、延伸率和硬度進(jìn)行了測(cè)定和分析。結(jié)果表明：當(dāng)微波燒結(jié)時(shí)間為30 min時(shí)，隨著燒結(jié)溫度的升高，合金性能呈峰值變化，燒結(jié)溫度為1550 ℃時(shí)，合金的力學(xué)性能達(dá)到極大值，相對(duì)密度、抗拉強(qiáng)度、延伸率和HRC硬度分別為98.3%、920 MPa、9.7%和30.5；當(dāng)微波燒結(jié)溫度為1550 ℃時(shí)，隨著燒結(jié)時(shí)間的延長(zhǎng)，合金的力學(xué)性能先上升后下降； 隨著微波燒結(jié)溫度的升高及微波燒結(jié)時(shí)間的延長(zhǎng)，鎢晶粒的尺寸逐漸增大。

    Abstract:

    The effects of temperature and time of microwave sintering on the microstructure and properties of powder extruded rods of W-based alloy were studied. Fracture morphologies and microstructures were examined by SEM and optical microscope, respectively. The relative density, the tensile strength, the elongation and the hardness of samples were measured and analyzed. The results show that when microwave sintering time is 30 min, the properties of samples change as a peak shape with the increase of sintering temperature. Upon sintered at 1550 °C, relative density, the tensile strength, the elongation and the hardness of the samples reach the maximum values of 98.3%, 920 MPa, 9.7% and 30.5, respectively. When the microwave sintering temperature is 1550 °C, the mechanical properties of samples increase firstly and then decrease with the increase of sintering time. The size of tungsten grains increases gradually with increasing of microwave sintering temperature and prolonging of microwave sintering time.

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劉文勝,張佳佳,馬運(yùn)柱,趙亞旭,徐志剛,黃伯云.微波燒結(jié)工藝對(duì)鎢基合金擠壓棒坯顯微組織及力學(xué)性能的影響[J].稀有金屬材料與工程,2012,41(7):1284~1288.[Liu Wensheng, Zhang Jiajia, Ma Yunzhu, Zhao Yaxu, Xu Zhigang, Huang Boyun. Effect of Microwave Sintering Parameters on Microstructure and Mechanical Properties of Powder Extruded Rods of Tungsten-Based Alloy[J]. Rare Metal Materials and Engineering,2012,41(7):1284~1288.]
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  • 收稿日期:2011-07-25
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