| 一种镍基高温合金蠕变过程中碳、硼化物的演变行为及结构表征 |
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| 引用本文： | 都贝宁,盛立远,赖琛,崔传勇,杨金侠,孙晓峰.一种镍基高温合金蠕变过程中碳、硼化物的演变行为及结构表征[J].稀有金属材料与工程,2017,46(8):2123-2129. |
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| 作者姓名： | 都贝宁 盛立远 赖琛 崔传勇 杨金侠 孙晓峰 |
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| 作者单位： | 北京大学深圳研究院,北京大学深圳研究院,北京大学深圳研究院,中科院金属研究所,中科院金属研究所,中科院金属研究所 |
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| 基金项目： | 中国博士后科学基金(2015M580923),深圳市基础研究项目(JCYJ20140419114548515),深圳市国际合作项目 (GJHZ20140419114548516),深圳市技术开发项目 (CXZZ20140419114548507),深圳市战略新兴产业发展专项资金(JCYJ20140419114548513) |
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| 摘 要： | 通过对一种镍基铸造K417G高温合金进行760℃/645 MPa、900℃/315 MPa和950℃/235 MPa 3种条件下的蠕变性能测试,并采用扫描电镜、透射电镜等实验方法对蠕变后高温合金微观组织进行表征,分析不同条件下的蠕变机理,并对比分析蠕变前后合金中碳、硼化物的形态、分布、晶体结构,研究不同蠕变温度和应力条件对碳、硼化物析出和演变行为的影响,并揭示碳、硼化物对镍基高温合金不同条件下蠕变性能的影响。结果显示,K417G高温合金的蠕变寿命随着蠕变条件由760℃/645 MPa向900℃/315 MPa和950℃/235 MPa转变先升高后降低。760℃/645MPa下,蠕变裂纹产生于MC型碳化物的碎裂;900℃/315 MPa下,蠕变裂纹一部分产生于晶界,另一部分产生于MC型碳化物碎裂;950℃/235 MPa下,蠕变裂纹全部产生于晶界。在760℃/645 MPa下,MC型碳化物不分解,晶界没有析出细小碳、硼化物;900℃/315 MPa下,MC型碳化物分解产生M23C6型碳化物,晶界析出细小均匀分布的M23C6型碳化物和M3B2型硼化物;950℃/235 MPa下,晶界M23C6型碳化物和M3B2型硼化物长大,呈条状分布。
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| 关 键 词： | 镍基高温合金 蠕变 碳化物 硼化物 |
| 收稿时间： | 2015/12/21 0:00:00 |
| 修稿时间： | 2016/4/6 0:00:00 |
Evolution and structure characterization of the carbide and boride during creep in a Ni-based superalloy |
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| Du Beining,Sheng Liyuan,Lai Chen,Cui Chuanyong,Yang Jinxia and Sun Xiaofeng.Evolution and structure characterization of the carbide and boride during creep in a Ni-based superalloy[J].Rare Metal Materials and Engineering,2017,46(8):2123-2129. |
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| Authors: | Du Beining Sheng Liyuan Lai Chen Cui Chuanyong Yang Jinxia and Sun Xiaofeng |
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| Affiliation: | Shenzhen Institute of Peking University,,,,, |
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| Abstract: | As the most common grain boundary strengthening elements in Ni-based superalloy, C and B are inclined to form carbides and borides with other elements, thus influence the mechanical performance of superalloy. In this paper, the evolution of the carbides and borides in a Ni-based superalloy during creep is studied. Through analyzing the creep mechanism at different conditions, and comparing the morphology, distribution and crystal structure of carbides and borides before and after creep tests, the influences of creep condition on the precipitation and evolution of carbides and borides are investigated, and the effects of carbides and borides on the creep properties of Ni-based superalloy are revealed. |
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| Keywords: | Ni-based superalloy creep carbide boride |
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