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采用真空感应熔炼技术制备不同B含量的高W、Cr镍基高温合金,测定了合金的持久性能和力学性能,研究了B含量对合金的持久性能和拉伸力学性能的影响。采用SEM和XRD对合金进行了微观形貌观察和相组成分析。结果表明,铸态合金中存在大量的α-W相,热处理后合金中α-W相溶入基体,仅在晶界区域存在少量的α-W相。B可提高合金在980℃、83 MPa下的持久寿命。室温条件下,随B含量的增加,合金的抗拉强度降低,塑性提高。900℃条件下,随B含量的增加,合金的抗拉强度稍有提高。室温条件下B对晶界的强化作用要小于高温条件下的强化作用。
The high W and Cr Ni-base superalloys with different B content were prepared by vacuum induction melting technique. The permanent and mechanical properties of the alloy were measured. The effect of B content on the ductility and tensile properties of the alloy was investigated. The microstructure and phase composition of the alloy were investigated by SEM and XRD. The results show that there are a large amount of α-W phase in the as-cast alloy. The α-W phase in the alloy after heat treatment dissolves into the matrix, and only a small amount of α-W phase exists in the grain boundary region. B can improve the alloy’s long life at 980 ℃ and 83 MPa. Under room temperature, with the increase of B content, the tensile strength of the alloy decreases and the plasticity increases. At 900 ℃, with the increase of B content, the tensile strength of the alloy slightly increased. The strengthening effect of B on the grain boundary under room temperature is less than that under high temperature.