吴剑涛,袁晓飞,宋圣玉,陈兴福,李维.Al含量对一种高W铸造高温合金组织与持久性能的影响[J].稀有金属材料与工程,0,():-.[Wu Jiantao,Yuan Xiaofei,Song Shengyu,Chen Xingfu,Li Wei.Influence of Al Content on the Microstructure and Stress rupture Property of Cast Superalloy with High W Content[J].Rare Metal Materials and Engineering,0,():-].
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Al含量对一种高W铸造高温合金组织与持久性能的影响
投稿时间:2020-06-09  修订日期:2020-06-18
中文关键词:  高W铸造高温合金  Al含量  持久性能  显微组织
基金项目:
中文摘要:
      以不同Al含量的高W铸造高温合金K416为研究对象,对不同Al含量合金在975℃/240MPa条件下的持久性能和室温基体显微硬度进行了测试。结果表明:随着Al含量的提高,合金的持久寿命和显微硬度均呈下降趋势,Al含量中限和高限合金在975℃/240MPa条件下的持久寿命低于技术条件规定值。进一步的组织表征结果表明:当Al含量为5.60%(质量分数,下同)时,合金中仅有极少量α-W相和初生M6C型碳化物析出。随着Al含量提高至6.20%,合金中α-W相和初生M6C型碳化物的面积分数由0.08%提高至2.1%,同时γ/γ′共晶的面积分数由12.6%提高至21.8%。Al含量的提高对合金晶粒、枝晶、MC型碳化物以及γ′相的尺寸和形貌影响不大。硬脆的初生M6C型碳化物的大量析出以及固溶强化元素W的消耗是其持久性能降低的主要原因。同时,对不同Al含量K416合金的持久断裂机制也进行了讨论。
Influence of Al Content on the Microstructure and Stress rupture Property of Cast Superalloy with High W Content
英文关键词:high W cast superalloy  Al content  stress rupture property  microstructures
英文摘要:
      Stress rupture tests at 975℃/240MPa and microhardness measurements at room temperature were conducted in high W cast superalloy K416 with various Al contents. The results showed that the stress rupture life and microhardness decreased gradually with increasing the content of Al, the stress rupture life of specimens with medium and high levels of Al content were lower than the values in standard. Microstructural characterization indicated that little M6C carbides and α-W phase were oberved when the Al content was 5.60% (mass fraction, the same below). The area fraction of M6C carbides and α-W phase increased from 0.08% to 2.1% with increasing the Al content to 6.20%. Meanwhile, the area fraction of γ/γ′ eutectics increased from 12.6% to 21.8%. The increase of Al content showed little effect on the sizes and morphologies of grains, dendrites, MC carbides and γ′ phase. The precipitation of brittle M6C carbides with high amounts and the depletion of solid solution strengthening element (W) were responsible for the diminished stress rupture property. In addition, the stress rupture mechanisms of K416 alloy with various Al contents were also discussed.
作者单位
吴剑涛 北京钢研高纳科技股份有限公司 
袁晓飞 北京钢研高纳科技股份有限公司 
宋圣玉 北京钢研高纳科技股份有限公司 
陈兴福 北京钢研高纳科技股份有限公司 
李维 北京钢研高纳科技股份有限公司 
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