一种含2%Ru单晶镍基合金的组织结构与蠕变性能
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- 英文论文题名：Microstructure and Creep Properties of a Single Crystal Nickel-based Superalloy Containing 2%Ru
- 论文作者：李秋阳 ; 田素贵 ; 蒋崇亮 ; 丁鑫
- 英文论文作者：Li Qiuyang ; Tian Sugui ; Jiang Chongliang ; Ding Xin ; School of Materials Science and Engineering ; Shenyang University of Technology
- 年：2015
- 作者机构：沈阳工业大学材料科学与工程学院;
- 论文关键词：单晶镍基合金 ; 元素Ru ; 组织演化 ; 蠕变性能
- 英文论文关键词：single crystal nickel-based superalloy ; element Ru ; microstructure evolution ; creep property
- 会议召开时间：2015-05-20
- 会议录名称：第十三届中国高温合金年会论文集
- 英文会议录名称：Proceedings of the 13th China Superalloys Conference
- 语种：中文
- 分类号：TG132.3
- 学会代码：ZGJS
- 会议名称：第十三届中国高温合金年会
- 会议地点：中国北京
- 主办单位：中国金属学会高温材料分会
- 学会名称：中国金属学会
- 页数：4
- 文件大小：1105k
- 原文格式：O
- 会议级别：全国
摘要
通过蠕变性能测试和组织形貌观察,研究了一种含2%Ru镍基单晶合金在高温的蠕变行为。结果表明,合金经完全热处理后的组织结构是立方γ′相以共格方式嵌镶在γ基体中,在蠕变期间,合金中的γ′相沿垂直于应力轴方向形成N-型筏形结构。在试验的温度和应力范围内,含Ru合金有较好的蠕变抗力及较长的蠕变寿命,测定出合金在1085℃/137MPa和1100℃/120MPa条件下的蠕变寿命分别为269h和167h,测算出合金在稳态期间的蠕变激活能为498.8kJ/mol。经高温蠕变断裂后,在样品不同区域γ′相有不同的粗化特征,在远离断口区域,筏状γ′相与应力轴垂直,随观察区域趋近断口,筏状γ′相发生扭曲,且粗化程度加剧,为样品发生缩颈,致使合金蠕变期间的有效应力增大所致。
By means of measuring creep properties and microstructure observation,the creep behaviors of a single crystal nickel- based alloy containing 2%Ru were investigated.Results show that after fully heat treated,the microstructure of the alloy consists of the cubical γ' phase embedded coherently in γ' matrix phase.In the initial stage of creep at high temperature,the cubical γ' phase in the alloy transforms into the rafted structure along the direction vertical to the stress axis.In the ranges of the applied stresses and temperatures,the alloy containing 2%Ru possesses a better creep resistance and longer creep lifetime,wherein,the creep lifetimes of the alloy at 1085℃/137 MPa and 1100℃/120 MPa are measured to be269 h and 167 h,respectively.And the creep activation energy of alloy during steady state creep is measured to be 498.8kJ/mol.After the alloy crept up to rupture,the γ'.phase in different regions displays the various configuration and coarsening features.The rafted γ' phase with straight feature displays in the region far from the fracture,while the twisting and coarsening γ' rafts appears in the regions near the fracture,which is attributed to the necking down of the specimen to enhance the effective stress due to the bigger plastic deformation.
By means of measuring creep properties and microstructure observation,the creep behaviors of a single crystal nickel- based alloy containing 2%Ru were investigated.Results show that after fully heat treated,the microstructure of the alloy consists of the cubical γ' phase embedded coherently in γ' matrix phase.In the initial stage of creep at high temperature,the cubical γ' phase in the alloy transforms into the rafted structure along the direction vertical to the stress axis.In the ranges of the applied stresses and temperatures,the alloy containing 2%Ru possesses a better creep resistance and longer creep lifetime,wherein,the creep lifetimes of the alloy at 1085℃/137 MPa and 1100℃/120 MPa are measured to be269 h and 167 h,respectively.And the creep activation energy of alloy during steady state creep is measured to be 498.8kJ/mol.After the alloy crept up to rupture,the γ'.phase in different regions displays the various configuration and coarsening features.The rafted γ' phase with straight feature displays in the region far from the fracture,while the twisting and coarsening γ' rafts appears in the regions near the fracture,which is attributed to the necking down of the specimen to enhance the effective stress due to the bigger plastic deformation.
引文
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[2]谭喜鹏,刘金来,等.一种含Ru镍基单晶高温合金的组织特征[J].金属学报,2012,48(5):569~574.
[3]Tan X P,Liu J L,et al.Effect of ruthenium on high temperature creep rupture life of a single nickel based superalloy[J].Mater.Sci.Eng.A528,2011,8381~8388.
[2]谭喜鹏,刘金来,等.一种含Ru镍基单晶高温合金的组织特征[J].金属学报,2012,48(5):569~574.
[3]Tan X P,Liu J L,et al.Effect of ruthenium on high temperature creep rupture life of a single nickel based superalloy[J].Mater.Sci.Eng.A528,2011,8381~8388.