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鑄態(tài)T800合金及其焊層的組織和高溫耐磨性能
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Microstructure and High-Temperature Fretting Wear Behavior of T800 Alloy in Casting and Cladding State
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    摘要:

    T800合金是一種優(yōu)異的高溫耐磨材料，廣泛應(yīng)用于渦輪葉冠表面強化。為了考察T800合金應(yīng)用于渦輪葉冠時的最佳服役狀態(tài)，對比研究了T800合金鑄態(tài)及其堆焊層的微觀組織、硬度和高溫耐微動磨損性能，結(jié)果表明，鑄態(tài)T800合金中Laves相的體積分?jǐn)?shù)高、尺寸大，其硬度和高溫耐微動磨損性更加優(yōu)異。分析認(rèn)為，在堆焊T800合金鑄造焊絲的過程中，焊接基材中的合金元素混合進入了焊接溶池中，對焊層起到稀釋作用，Laves相會發(fā)生溶解再析出反應(yīng)，結(jié)果導(dǎo)致T800合金焊層中的Laves相體積分?jǐn)?shù)大幅降低、尺寸變小，其硬度和耐磨性明顯低于鑄態(tài)T800合金

    Abstract:

    T800 alloy is a good wear-resistant coating material for tip shrouds of turbine blades operated at high temperature. In order to make clear the best serving state of T800 alloy, microstructure and high-temperature fretting wear behavior of T800 alloy in casting and cladding state were studied. During welding, alloying elements of K417G alloy substrate diffused into welding melting pool, which resulted in that there was a decrease in the alloying elements of the T800 clad. Laves phases were dissolved completely and then precipitated to form fine Laves phases in matrix during solidification. As a result, as-cast T800 possessed larger volume fraction and size of Laves phases, higher hardness and high-temperature fretting wear resistance than T800 cladding

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李尚平,駱合力,曹 栩,張喜娥.鑄態(tài)T800合金及其焊層的組織和高溫耐磨性能[J].稀有金屬材料與工程,2013,42(3):603~606.[Li Shangping, Luo Heli, Cao Xu, Zhang Xi’e. Microstructure and High-Temperature Fretting Wear Behavior of T800 Alloy in Casting and Cladding State[J]. Rare Metal Materials and Engineering,2013,42(3):603~606.]
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  • 收稿日期:2012-02-15
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