3;溶解析出;超粗晶;硬質(zhì)合金;WC-10Co"/> 3、Co、C為原料,通過原位細(xì)晶溶解-析出長(zhǎng)大法制備了超粗硬質(zhì)合金,并分析了不同WO3添加量對(duì)合金微觀結(jié)構(gòu)及性能影響規(guī)律。結(jié)果表明：初始粉末中加入的WO3和C在燒結(jié)過程中將發(fā)生原位一步還原碳化反應(yīng)轉(zhuǎn)化為高活性的細(xì)WC,促進(jìn)溶解-析出長(zhǎng)大現(xiàn)象,使超粗硬質(zhì)合金WC平均晶粒度隨著WO3含量增加而增大。同時(shí),WO3添加能夠減少粗WC晶粒微觀缺陷和曲邊的階梯狀表面,平直化晶粒邊界,使其形貌趨于形成完整的三角棱柱體,其(0 0 0 1)晶面占比高,能夠有效提高合金硬度,阻礙裂紋擴(kuò)展,增加鈷相韌性斷裂比例。當(dāng)WO3添加量為4.20wt.%時(shí),制備的超粗硬質(zhì)合金具有最大的硬度(1085kgf/mm2)和抗彎強(qiáng)度(2692MPa)。"/>

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WO3添加量對(duì)超粗硬質(zhì)合金微觀結(jié)構(gòu)及性能影響*
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作者單位:

1.崇義章源鎢業(yè)股份有限公司;2.江西理工大學(xué)

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贛州市重點(diǎn)研發(fā)計(jì)劃一般項(xiàng)目(202101124490)；贛州市重點(diǎn)研發(fā)計(jì)劃重點(diǎn)項(xiàng)目(202101074491)；江西省教育廳自然科學(xué)基金面上項(xiàng)目(GJJ200807)；江西省主要學(xué)術(shù)和技術(shù)帶頭人培育計(jì)劃青年人才項(xiàng)目(20212BCJ23005)


Effect of WO3 content on microstructure and properties of ultracoarse grained cemented carbide
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Affiliation:

1.Chongyi Zhangyuan Tungsten Co,Ltd;2.Faculty of Materials Metallurgy and Chemistry,Jiangxi University of Science and Technology

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    摘要:

    本文以WC、WO3、Co、C為原料,通過原位細(xì)晶溶解-析出長(zhǎng)大法制備了超粗硬質(zhì)合金,并分析了不同WO3添加量對(duì)合金微觀結(jié)構(gòu)及性能影響規(guī)律。結(jié)果表明：初始粉末中加入的WO3和C在燒結(jié)過程中將發(fā)生原位一步還原碳化反應(yīng)轉(zhuǎn)化為高活性的細(xì)WC,促進(jìn)溶解-析出長(zhǎng)大現(xiàn)象,使超粗硬質(zhì)合金WC平均晶粒度隨著WO3含量增加而增大。同時(shí),WO3添加能夠減少粗WC晶粒微觀缺陷和曲邊的階梯狀表面,平直化晶粒邊界,使其形貌趨于形成完整的三角棱柱體,其(0 0 0 1)晶面占比高,能夠有效提高合金硬度,阻礙裂紋擴(kuò)展,增加鈷相韌性斷裂比例。當(dāng)WO3添加量為4.20wt.%時(shí),制備的超粗硬質(zhì)合金具有最大的硬度(1085kgf/mm2)和抗彎強(qiáng)度(2692MPa)。

    Abstract:

    In this paper, ultracoarse grained cemented carbide was prepared by in-situ fine grain dissolution-precipitation method with WC, WO3, Co and C as raw materials. The effects of different WO3 content on the microstructure and mechanical properties of the alloy were analyzed. The results show that the WO3 and C could undergo in-situ reduction-carbonization reaction to form fine WC with high activity. In the liquid phase sintering, fine WC dissolution-precipitation could promote the coarse WC grains growth, reducing the micro defects and growth steps, flattening the boundary of WC grains, which could make the morphology of coarse WC grains tend to a fully developed triangular prism. The ultracoarse WC grains with high flattening degree effectively increased the proportion of WC (0 0 0 1) axial plane, improved the hardness, hindered the crack propagation, and strengthened the alloy. So, the alloy with 4.20wt% WO3 added had the maximum hardness (1085kg/mm2) and transverse rupture strength (2692MPa).

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唐彥淵,鐘志強(qiáng),陳邦明,鐘遠(yuǎn),徐國(guó)鉆,陳麗勇,羊求民. WO3添加量對(duì)超粗硬質(zhì)合金微觀結(jié)構(gòu)及性能影響*[J].稀有金屬材料與工程,2023,52(8):2805~2810.[Tang Yan-yuan, Zhong Zhi-qiang, Chen Bang-ming, Zhong yuan, Xu Guo-zuan, Chen Liyong, Yang Qiu-min. Effect of WO3 content on microstructure and properties of ultracoarse grained cemented carbide[J]. Rare Metal Materials and Engineering,2023,52(8):2805~2810.]
DOI：10.12442/j. issn.1002-185X.20220593

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  • 收稿日期:2022-07-16
  • 最后修改日期:2022-09-08
  • 錄用日期:2022-09-27
  • 在線發(fā)布日期: 2023-08-28
  • 出版日期: 2023-08-24