冷却速度对VST55531钛合金的显微组织和力学性能的影响
发布人：上海艾荔艾合金股份有限公司www.shailiai.cn
更新时间：2016-01-20
研究不同冷却速度(水冷、空冷和炉冷)对VST55531合金的显微组织和拉伸性能的影响。
冷却速度对VST55531钛合金的显微组织和力学性能的影响Effects of cooling rate on microstructure and properties of VST55531 alloy研究不同冷却速度(水冷、空冷和炉冷)对VST55531合金的显微组织和拉伸性能的影响。结果表明：合金分别经820 ℃和900 ℃固溶处理及580 ℃时效后，其强度随冷却速度的减小而逐渐降低，塑性逐渐升高。合金在900 ℃固溶的组织为粗大b晶粒的魏氏组织，其固溶水冷和空冷及时效后获得的强度最高，达到1 400 MPa。合金经820 ℃固溶及时效后，获得双态组织，且塑性较好；经820 ℃，1 h固溶空冷和580 ℃，4 h时效的合金，具有较高的强度和较好的塑性匹配。
The microstructures and tensile properties of VST55531 alloys with different cooling rates were studied，including water cooling, air cooling and furnace cooling. The results show that when the cooling rate gets slower, the strength decreases while the plasticity increases. When the alloy is solution treated at 900 ℃ and then aged, the main microstructure is Widmanstatten with coarse β grain and the strength can reach 1 400 MPa with water cooling and air cooling methods. When the alloy is solution treated at 820 ℃ and then aged, the microstructure is bi-modal with good plasticity. The alloy has better balance of strength and plasticity under aging treatment of 820 ℃, 1 h solution (air cooling) and 580 ℃, 4 h.
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