50%返回料添加比再生K465合金组织特征及力学性能

Microstructural characteristics and mechanical properties of recycled K465 alloy with 50% return material addition ratio

  • 摘要: 采用真空感应熔炼方法制备了50%返回料添加比的K465母合金,利用金相显微镜(OM)、扫描电镜(SEM)、能谱仪(EDS)、X射线衍射仪(XRD)研究了返回料再生K465合金铸态微观组织,用电子万能试验机和电子高温持久试验机分别研究了固溶处理后的室温拉伸和高温持久性能。研究结果表明,返回料再生K465合金铸态织组均匀,主要由γ基体相通道,γ'相和(γ+γ') 共晶相以及碳化物组成,碳化物是富含Nb、Ti、Mo、W元素的MC型碳化物。再生合金固溶处理后温抗拉强度为888 MPa,伸长率为7.5 %,在900 ℃/200 MPa下的高温持久寿命为832 h16 min。

     

    Abstract: The K465 master alloy incorporating 50% recycled material was prepared using vacuum induction melting. The as-cast microstructure of recycled K465 alloy was investigated through optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and X-ray diffraction (XRD). The room temperature tensile properties and high-temperature stress rupture performance after solution treatment were examined using a universal testing machine and creep testing machine. Results indicate that the as-cast microstructure of recycled K465 alloy primarily consists of γ matrix phase channels, γ' phase, (γ+γ') eutectic phase, and carbides. These carbides are MC-type carbides rich in Nb, Ti, Mo, and W. After solution treatment, the recycled alloy exhibits a room temperature tensile strength of 888 MPa with 7.5% elongation, and demonstrates a high-temperature stress rupture life of 832 hours and 16 minutes under 900 ℃/200 MPa conditions.

     

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