均匀化工艺对GH5188合金组织及力学性能的影响

利用JMatPro软件、金相显微镜、扫描电镜、能谱分析以及高温拉伸、高温压缩试验等方法，分析GH5188合金铸锭的溶质元素偏析规律、均匀化热处理过程的微观组织演变规律及均匀化过程对GH5188合金力学性能的影响。研究表明，GH5188合金的主要析出相为M₆C和M₂₃C₆,合金中的主要正偏析元素为W和Cr,负偏析元素为Ni和Co。采取1200℃×72 h的均匀化工艺，可以有效消除原始铸态块状析出相，消除W、Cr、Ni、Co等元素偏析，达到最合适的均匀效果。均匀化热处理后，GH5188合金的力学性能得到了提升，在1180℃拉伸、压缩条件下，抗拉强度达到158 MPa,变形抗力为244.29 MPa。

Effect of homogenization treatment on microstructure and mechanical properties of GH5188 alloy

Law of solute element segregation and microstructure evolution during homogenization heat treatment process of GH5188 alloy ingots and the effect of homogenization process on mechanical properties of GH5188 alloy were analyzed by means of JMatPro software, metallurgical microscope, scanning electron microscopy, energy dispersive spectroscopy and high temperature tensile and compression tests. The results show that the main precipitation phases of the GH5188 alloy are M₆C and M₂₃C₆, the important positive segregation elements are W and Cr, and important negative segregation elements are Ni and Co. 1200 ℃×72 h homogenization treatment can reduce original precipitated phases in as-cast ingots, eliminate W, Cr, Ni, Co, et al element segregation and achieve the most suitable uniformity. After homogenization heat treatment process, the mechanical properties of the GH5188 alloy are improved. Under tensile and compression conditions at 1180 ℃, the tensile strength reaches 158 MPa, and the deformation resistance is 244.29 MPa.