单晶高温合金CMSX-4铸件再结晶
Recrystallization of single crystal superalloy CMSX-4casting
查看参考文献34篇
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文摘
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以单晶高温合金CMSX-4为研究对象,设计制备一种含5层平台的单晶试板铸件,研究其在不同温度下进行固溶热处理后的再结晶行为。结果表明:经固溶热处理后除最下层平台外,其余每层平台的截面突变处均有再结晶产生,再结晶面积随平台所处高度的增加先增大后减小;铸件外侧平台比内侧平台更容易产生再结晶。固溶热处理温度TH对铸件平台再结晶形核和长大的影响非常显著,当TH从1303℃提升到1315℃时,再结晶面积从9.7mm~2增加到293 mm~2,增幅高达30倍。由于截面突变,铸件平台部位会在凝固及冷却过程中产生较大的塑性变形并积聚大量的变形能,在后续热处理时截面突变处易成为再结晶的起源;同时,因凝固过程中换热条件、冷却速率和变形速率的差异,导致铸件各部位的应力分布不均,在固溶热处理后表现出不同的再结晶行为。此外,提高TH能够有效促进γ/γ'共晶组织和粗大γ'相的溶解,减少γ/γ'共晶组织及粗大γ'相对再结晶晶界迁移过程中的钉扎作用,显著增加再结晶缺陷区域。 |
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其他语种文摘
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Single crystal plate castings of superalloy CMSX-4 were prepared,providing simplified geometries of turbine blades featured with five stage platforms.The recrystallization behavior in the plate castings was investigated after solution heat treatments at different temperatures.The results show that after solution heat treatment,recrystallization occurs at the abrupt cross-section of every platform except the lowest one.The recrystallization area increases and then decreases as the platform's height increases.The outside platform of the casting is also more likely to result in recrystallization than the inside one.The nucleation and growth of the recrystallization grains are significantly influenced by the solution heat treatment temperature(TH).When THis raised from 1303℃to 1315 ℃,the recrystallization area increases by 30times,from 9.7mm~2 to 293mm~2. Because of the abrupt section transition,the platform part of the casting will produce more plastic deformation and accumulate a large amount of deformation energy during solidification and cooling, and the abrupt change in cross-section will easily become the source of recrystallization during the subsequent heat treatment.Meanwhile,the difference in heat exchange conditions,cooling rate and deformation rate during solidification leads to uneven stress distribution.As a result,different recrystallization behaviors appear after solution heat treatment.Furthermore,increasing TH can effectively promote the dissolution ofγ/γ'eutectics and coarseγ'phase,reduce the pinning effect of residualγ/γ'eutectics and coarseγ'phase in the recrystallization grain boundary migration process, and significantly increase the recrystallization defect area. |
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来源
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材料工程
,2023,51(10):42-50 【核心库】
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DOI
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10.11868/j.issn.1001-4381.2023.000187
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关键词
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单晶高温合金
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CMSX-4
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再结晶
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塑性应变
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数值模拟
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地址
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1.
中南大学机电工程学院, 长沙, 410083
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深圳市万泽中南研究院有限公司, 广东, 深圳, 518045
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中南大学粉末冶金研究院, 长沙, 410083
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1001-4381 |
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学科
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金属学与金属工艺 |
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基金
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国家自然科学基金项目
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中南大学研究生科研创新项目(自主探索)
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深圳市海外高层次人才基金资助
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广东省引进创新创业团队项目资助
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文献收藏号
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CSCD:7579861
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