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硼对大型高温合金铸件高温拉伸性能的影响
Effect of Boron on High Temperature Tensile Properties of Nickel-Base Superalloy Large Casting
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- DOI:
- 作者:
- 冯微 张华霞 田国利 孟宇
FENG Wei;ZHANG Huaxia;TIAN Guoli;MENG Yu
- 作者单位:
- 北京航空材料研究院熔铸中心
Melting & Casting Center, Beijing Institute of Aeronautical Materials, Beijing 100095, China
- 关键词:
- 硼化物 抗拉强度 铸件 高温合金
boride tensile strength casting foundry superalloy
- 摘要:
- 研究了含0.020%B、1 100℃高温抗拉强度大于360 MPa、直径为准1 120 mm的镍基高温合金铸件。对铸件本体进行解剖,并在横截面不同部位取样进行化学成分分析和力学性能测试,研究了B元素在铸件内部的分布和对性能的影响。结果表明,B元素偏析于铸件上部(靠近冒口),含量为0.029%。骨架状M3B2分布于共晶γ′相周围,可能成为裂纹萌生和扩展的路径,造成铸件上部1 100℃高温拉伸性能显著下降至300 MPa。因此,建议对于质量大于1 000 kg的大型铸件而言,需要兼顾铸造性和硼元素的偏析,为了确保性能,需将硼元素含量做相应调整。The nickel-based superalloy castings containing 0.020% B, 1 100 ℃ high temperature tensile strength greater than 360 MPa, with 1 120 mm in diameter was studied. The body of the casting was dissected, and the chemical composition and mechanical properties of different parts of the cross section were analyzed to study the distribution of B element in the casting and its influence on the mechanical properties. The results show that the B element is separated from the upper part of the casting(near the riser), and the content is 0.029%. The skeletal M3 B2 phases distribute in eutectic γ′phase, it may be the path of the crack initiation and propagation, and 1 100 ℃ high temperature tensile properties on the top of casting significantly dropped to 300 MPa. Therefore, it is suggested that for large castings with a mass greate r than 1 000 kg, both castability and segregation of boron elements should be considered. In order to ensure the performance,boron element content should be adjusted accordingly.