1-x逐漸增加并分布在α/β相界和晶界處,熔覆層平均硬度比基體提高34%,硬度最高可達(dá)基體的1.49倍。熔覆層磨損體積和磨損系數(shù)變化規(guī)律一致,呈現(xiàn)為先降低后升高再降低。磨損表現(xiàn)形式為磨料磨損,磨損系數(shù)均與基材相近。磨損率隨WC顆粒質(zhì)量分?jǐn)?shù)增加而降低,WC含量10%時熔覆層耐磨性能最好,較基材提升25%。"/>

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WC顆粒含量對TC4激光沉積耐磨特性的影響機(jī)制研究
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作者單位:

1.沈陽航空航天大學(xué)機(jī)電工程學(xué)院;2.中國科學(xué)院沈陽自動化研究所

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中圖分類號:

TG146.4

基金項(xiàng)目:

國防科技重點(diǎn)實(shí)驗(yàn)室基金(JCKY61420052017)、國家自然科學(xué)基金(52105415)


Influence mechanism of WC particle content on wear resistance of TC4 laser deposition
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Affiliation:

1.College of Mechanical and Electrical Engineering,Shenyang Aerospace University,Liaoning Shenyang;2.Shenyang Institute of Automation, Chinese Academy of Science, Liaoning Shenyang

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    摘要:

    針對TC4鈦合金耐磨性能差的缺點(diǎn),采用激光熔化沉積技術(shù)(LMD)進(jìn)行同步送粉法熔覆復(fù)合粉末(3~5μmWC與53~150μmTC4)制備出2mm厚的耐磨強(qiáng)化熔覆涂層。使用光學(xué)顯微鏡(OM)和掃描電鏡(SEM)觀察并分析熔覆層的顯微組織及其元素組成成分,在室溫干摩擦往復(fù)滑動條件下測試熔覆層的磨損性能并分析其磨損機(jī)理。結(jié)果表明：熔覆涂層與基體結(jié)合性良好,無明顯裂紋、氣孔等缺陷。隨著WC顆粒質(zhì)量分?jǐn)?shù)增加,(Ti,W)C1-x逐漸增加并分布在α/β相界和晶界處,熔覆層平均硬度比基體提高34%,硬度最高可達(dá)基體的1.49倍。熔覆層磨損體積和磨損系數(shù)變化規(guī)律一致,呈現(xiàn)為先降低后升高再降低。磨損表現(xiàn)形式為磨料磨損,磨損系數(shù)均與基材相近。磨損率隨WC顆粒質(zhì)量分?jǐn)?shù)增加而降低,WC含量10%時熔覆層耐磨性能最好,較基材提升25%。

    Abstract:

    A In view of the poor wear resistance of TC4 titanium alloy, laser melting deposition technology (LMD) was used to fabricate a 2mm thick wear resistant cladding coating of composite powder (3~5μmWC and 53~150μmTC4) by synchronous powder feeding method. Optical microscope (OM) and scanning electron microscope (SEM) were used to observe and analyze the microstructure and elemental composition of the cladding layer. The wear properties of the cladding layer were tested and its wear mechanism was analyzed under the condition of dry friction reciprocating sliding at room temperature. The results show that the cladding coating has good adhesion to the substrate and no obvious cracks, pores and other defects. With the increase of WC particle mass fraction, (Ti,W)C1-x increases gradually and distributes at α/β phase boundary and grain boundary. The average hardness of cladding layer is 34% higher than that of matrix, and the hardness is up to 1.49 times of matrix. The wear volume and wear coefficient of the cladding layer change in the same way, decreasing first, then increasing and then decreasing. The wear is abrasive wear, and the wear coefficient is close to the base material.The wear rate decreases with the increase of WC particle mass fraction. When WC content is 10%, the wear resistance of cladding layer is the best, which is 25% higher than that of base material.

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李鑫,劉紅軍,趙宇輝,趙吉賓,賀晨,王志國,何振豐. WC顆粒含量對TC4激光沉積耐磨特性的影響機(jī)制研究[J].稀有金屬材料與工程,2023,52(5):1861~1868.[Li Xin, Liu Hongjun, Zhao Yuhui, Zhao Jibin, He Chen, Wang Zhiguo, He Zhenfeng. Influence mechanism of WC particle content on wear resistance of TC4 laser deposition[J]. Rare Metal Materials and Engineering,2023,52(5):1861~1868.]
DOI：10.12442/j. issn.1002-185X.20220367

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  • 收稿日期:2022-04-28
  • 最后修改日期:2022-06-15
  • 錄用日期:2022-07-12
  • 在線發(fā)布日期: 2023-06-08
  • 出版日期: 2023-05-29