形变热处理对涡轮盘用GH169合金组织和性能的影响
THE EFFECT OF THERMAL MECHANICAL TREATMENT ON THE MICROSTRUCTURE AND PROPERTIES OF GH169 DISC ALLOY
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摘要: 本文研究了正常热处理和两种形变热处理状态的涡轮盘用Ni-Fe基GH169合金.发现用文中提出的形变热处理可以减少合金元索的偏析及S-N i3Nb相的有害作用。结果表明,在不降低持久寿命的情况下,拉伸强度、低周疲劳性能以及塑性显著提高.形变热处理对合金性能的改善归结于晶粒组织的细化和颗粒状S相对晶界的强化。这种颗粒的S相可以改善合金的高温断裂过程,即山晶间断裂变为穿晶韧性断裂.Abstract: The Ni-Fe base GH169 disc alloy under normal heat treatment and two types of thermal mechanical treament(TMT)conditions has been studied in this paper,It was found that the segregation of alloy elements and the detrimental effect of -Ni3 Nb could be greatly reduced after the TMT.The experimental results indicated that the tensile strength and low cycle fatigue properties as well as the ductility of the alloy were increased substantially with its stress rupture lives comparable to that under the normal heat treatment condition, The improvement in the mechanical properties of the alloy after the TMT can be ascribed to the refinement of grain structures and the strengthening of the grain boundary region by dispersed granular c5 particals which, in turn,improve the fracture process of the alloy at elevated temperature,i.e.,from an intergranular rupture to ductile dimplefracture.
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