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Effect of Isothermal Heat Treatment on Mechanical Properties of WC-17Co Coatings
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Effect of Isothermal Heat Treatment on Mechanical Properties of WC-17Co Coatings
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Major Projects of National Science and Technology (2011zx04014-21)

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    摘要:

    利用超音速火焰噴涂技術(shù)在Ni718合金表面制備WC-17Co涂層，然后進(jìn)行150 ℃/10 h，300 ℃/10 h和450 ℃/10 h恒溫?zé)崽幚?。利用納米壓痕和顯微壓痕的方法研究熱處理過程對涂層顯微硬度、彈性模量和斷裂韌性的影響，利用Almen試片曲率法計(jì)算試片中殘余應(yīng)力的變化。結(jié)果表明，150，300和450 ℃的熱處理過程未對WC-17Co涂層的組織和結(jié)構(gòu)特征造成顯著地影響；涂層的顯微硬度、彈性模量和斷裂韌性隨熱處理溫度的升高而降低；涂層機(jī)械性能隨溫度升高而降低的變化趨勢是由涂層殘余壓應(yīng)力的變化特征引起的。

    Abstract:

    WC-17Co cermet coatings were deposited on Ni718 alloys using the high-velocity oxygen fuel (HVOF) technique. These coatings were then heat treated by different processes (150?°C, 10?h; 300?°C,?10?h; 450?°C,?10?h). The effects of heat treatment on microhardness, elasticity modulus, and fracture toughness were studied by an indentation method. The residual stresses of the coated specimens were evaluated by the Almen strip method. The results show that the phase constitution and the structure of the WC-17Co coatings exhibit no obvious change in 150, 300, and 450 °C heat-treatment. The microhardness, elasticity modulus, and fracture toughness of the WC-17Co coatings decrease with the increase of heat treatment temperature. The descent tendency of the mechanical properties is attributed to the decline in compressive residual stresses after isothermal heat treatment.

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丁坤英,王立君,孫 振,劉延寬. Effect of Isothermal Heat Treatment on Mechanical Properties of WC-17Co Coatings[J].稀有金屬材料與工程,2014,43(10):2365~2369.[Ding Kunying, Wang Lijun, Sun Zhen, Liu Yankuan. Effect of Isothermal Heat Treatment on Mechanical Properties of WC-17Co Coatings[J]. Rare Metal Materials and Engineering,2014,43(10):2365~2369.]
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  • 收稿日期:2013-10-13
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  • 在線發(fā)布日期: 2015-04-07
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