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固溶處理對CoCrW合金組織及耐磨性能的影響
發布人：上海艾荔艾金屬材料有限公司www.jshcn.cn
更新時間：2015-11-30
以鑄造CoCrW合金為研究對象，通過XRD、SEM和EDS 分析以及硬度測試和室溫耐磨實驗，研究了不同溫度的固溶處理對該合金的組織及耐磨性能的影響。
固溶處理對CoCrW合金組織及耐磨性能的影響Effects of Solution Treatment on Microstructure and Wear-resistant?Properties of CoCrW Alloys
以鑄造CoCrW合金為研究對象，通過XRD、SEM和EDS 分析以及硬度測試和室溫耐磨實驗，研究了不同溫度的固溶處理對該合金的組織及耐磨性能的影響。結果表明：鑄態和固溶態CoCrW合金組織均由M23C6、M6C和γ-Co 基體3 種相組成，但固溶后合金中碳化物的大小、形貌及分布發生明顯變化。固溶后合金中起強化作用的碳化物大量溶解，使合金硬度和耐磨性能降低；隨著固溶溫度的升高，部分碳化物中的Cr, W等合金元素大量固溶到基體中，提高了基體的強度，使合金的硬度和耐磨性能有所提高；鑄態和固溶態CoCrW合金的磨損機制均為磨粒磨損、黏著磨損和氧化磨損的共同作用。?
CoCrW alloy is a kind of stellite alloy, which has high strength, good wear?resistance, and is widely used in aviation industry, nuclear industry and other fields. For a long?time, the CoCrW alloy is mainly used as coating to have an effect on wear and the corrosion?resistance. With the development of the industry, the conventional cast CoCrW alloy has been?widely studied. The mechanical properties of the cast CoCrW alloy can be changed by heat?treatment, which is of high hardness and great brittleness. In this paper, hardness and?wear-resistant properties of the as-cast and solid solution treated CoCrW alloys were studied by?combining XRD, SEM, EDS, hardness test and wear resistance test, and effects of the solid?solution temperature on the microstructure and were-resistant properties were also investigated.?The results showed that the microstructures of the as-cast and solid solution treated CoCrW alloy?were both composed of M23C6, M6C and γ-Co matrix, but the size, morphology and distribution of?carbides occurred in the alloy changed obviously by solid solution treatment. The dissolution of a?
large amount of carbides in the alloy after solid solution treatment was mainly responsible for the?decrease in hardness and wear resistance of the alloy compared with that of the as-cast one. With?the increase of the solid solution temperature, the Cr, W and other alloying elements in the?carbides were solid dissolved into the?γ-Co matrix so as to strengthen the?matrix resulting in the improvement of?the hardness and the associated wear?resistance of the alloy. The mechanism that controlling wear resistant property of the as-cast and?solid solution treated CoCrW alloys was the interaction of abrasive wear, adhesive wear and?oxidation wear.
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