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Effect of Preannealing on Microstructural Evolution and Tensile Properties of a Novel Nickel‐Based Superalloy
Advanced Engineering Materials ( IF 3.4 ) Pub Date : 2020-04-17 , DOI: 10.1002/adem.202000134 Shaomin Lv 1, 2 , Chonglin Jia 2 , Xinbo He 1 , Zhipeng Wan 2 , Zheng Chen 3 , Xuanhui Qu 1
Advanced Engineering Materials ( IF 3.4 ) Pub Date : 2020-04-17 , DOI: 10.1002/adem.202000134 Shaomin Lv 1, 2 , Chonglin Jia 2 , Xinbo He 1 , Zhipeng Wan 2 , Zheng Chen 3 , Xuanhui Qu 1
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The effect of preannealing (PA) on microstructural evolution and tensile properties of a novel nickel‐based alloy GH4065 is investigated. Particularly, the study of PA in disc superalloys is reported herein for the first time. The detailed strengthening mechanisms of specimens under different heat treatment cycles are identified by electron backscatter diffraction (EBSD) and transmission electron microscope (TEM) observations. The results reveal that the PA treatment after deformation improves the homogeneity of the microstructure due to static recrystallization (SRX). Multimodal size distributions and the morphology of γ′ precipitates are found after the PA + solution + aging (PASA). Also, the distributions of secondary and tertiary γ′ precipitates are optimized due to the PA. The tensile strength of GH4065 alloy after PASA is higher than that of as‐forged (AF) alloy and solution + aging (SA) alloy attributed to the improved microstructure during PA treatment. Compared with the SA specimens, the specimens of GH4065 alloy after PASA treatment lead to significant strengthening as the yield strength increased to more than 150 MPa, which is mainly due to the contribution from annealing twins and microtwins strengthening, as well as the grain refinement and γ′ precipitation strengthening.
中文翻译：
预退火对新型镍基高温合金的组织演变和拉伸性能的影响
研究了预退火（PA）对新型镍基合金GH4065的组织演变和拉伸性能的影响。特别地，本文首次报道了盘状高温合金中PA的研究。通过电子背散射衍射（EBSD）和透射电子显微镜（TEM）观察，确定了在不同热处理周期下试样的详细强化机理。结果表明，变形后的PA处理由于静态再结晶（SRX）而提高了微观结构的均匀性。在PA +溶液+老化（PASA）后，发现多峰尺寸分布和γ'沉淀物的形态。同样，由于PA，使次生和三次γ'沉淀物的分布最优化。PASA后的GH4065合金的抗拉强度高于锻造（AF）合金和固溶+时效（SA）合金，这归因于PA处理过程中改善的微观结构。与SA试样相比，经过PASA处理的GH4065合金试样屈服强度增加到150 MPa以上，从而导致明显的强化，这主要归因于退火孪晶和微孪晶强化的贡献以及晶粒细化和细化。 γ'沉淀强化。
更新日期：2020-04-17
中文翻译：
预退火对新型镍基高温合金的组织演变和拉伸性能的影响
研究了预退火（PA）对新型镍基合金GH4065的组织演变和拉伸性能的影响。特别地，本文首次报道了盘状高温合金中PA的研究。通过电子背散射衍射（EBSD）和透射电子显微镜（TEM）观察，确定了在不同热处理周期下试样的详细强化机理。结果表明，变形后的PA处理由于静态再结晶（SRX）而提高了微观结构的均匀性。在PA +溶液+老化（PASA）后，发现多峰尺寸分布和γ'沉淀物的形态。同样，由于PA，使次生和三次γ'沉淀物的分布最优化。PASA后的GH4065合金的抗拉强度高于锻造（AF）合金和固溶+时效（SA）合金，这归因于PA处理过程中改善的微观结构。与SA试样相比，经过PASA处理的GH4065合金试样屈服强度增加到150 MPa以上，从而导致明显的强化，这主要归因于退火孪晶和微孪晶强化的贡献以及晶粒细化和细化。 γ'沉淀强化。
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