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固溶處理對熱壓成型CoCrW合金組織及力學性能的影響
發布人：上海艾荔艾金屬材料有限公司www.jshcn.cn
更新時間：2015-12-01
利用SEM, XRD 和TEM 等分析手段研究了固溶處理對熱壓燒結CoCrW合金相組成的影響, 通過硬度測試、室溫拉伸和摩擦磨損實驗, 研究了固溶處理對熱壓燒結CoCrW合金力學性能的影響.
固溶處理對熱壓成型CoCrW合金組織及力學性能的影響EFFECT OF SOLID SOLUTION TREATMENT ON MICROSTRUCTURE?AND MECHANICAL PROPERTIES OF HOT-PRESSED CoCrW ALLOYS
利用SEM, XRD 和TEM 等分析手段研究了固溶處理對熱壓燒結CoCrW合金相組成的影響, 通過硬度測試、室溫拉伸和摩擦磨損實驗, 研究了固溶處理對熱壓燒結CoCrW合金力學性能的影響. 結果表明, 熱壓態與固溶態CoCrW合金的組成相均為M23C6, M6C, CrCo金屬間化合物和γ-Co基體; 固溶處理降低了合金中的 M23C6含量、原始顆粒邊界, 同時改善了合金塑性和耐磨性能. 合金室溫硬度、抗拉強度均隨固溶溫度升高、固溶時間延長而先增高后降低.?
Co-based alloy has high strength, good corrosion and wear resistance, and is widely used in aviation?industry, nuclear industry. The cast Co-based alloys has high hardness brittleness, but the toughness is low, which?limits its widely use. The CoCrW alloy prepared by powder metallurgy process has high toughness, at the same?time, the mechanical properties of the CoCrW alloy can be changed by heat treatment. In this work, the effect of?solid solution treatment on the microstructure and mechanical properties of the hot pressed alloy was studied by?SEM, XRD and TEM, hardness test, room-temperature tensile and wear experiment. The results show that the?microstructure of the as-hot pressed and solid solution state CoCrW alloy are both composed of M23C6, M6C,?CrCo intermetallic compound and γ-Co matrix, the contents of M23C6 and prior particle boundaries decrease?remarkably after solution treatment, meanwhile, the toughness and wear resistance of the alloy are improved. With?the increase of solid solution temperature and time, the hardness and tensile strength at room temperature of?CoCrW alloys increase first and then decrease.
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