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Evolution of γ' precipitates in gh4742 superalloy based on complete forging-heat treatment process

Journal of Iron and Steel Research International 2022年第11期29卷 1873-1885页

作者： Qiang Tian He-yong Qin Wen-yun Zhang Wen-wen Zhang Hai-zhu Li Qiang Du Xin-gang Liu High Temperature Materials Research Division Central Iron and Steel Research InstituteBeijing 100081China College of Mechanical Engineering Yanshan UniversityQinhuangdao 066004HebeiChina

The temperature changes at the rim,1/2 radius,and bore of the turbine disk during the solution treatment were *** on the measured temperature data,solution treatment experiments with different cooling rates(14,51,and 93℃/min)were performed,and the solution temperatures were 1120 and 1080℃.At all three cooling rates,the multimodal size distribution of γ' precipitates was detected,and the size of γ' precipitates is inversely related to the cooling *** the secondary and tertiary γ' precipitates were found at a solution temperature of 1120℃,and the secondary γ' precipitates progressed from spherical(93 and 51℃/min)to flower-like(14℃/min)shape,with the flower-like γ' precipitates regulated by *** a solution temperature of 1080℃,the γ' precipitates evolve from cuboids(93 and 51℃/min)to irregular shapes(14℃/min).Irregular γ' precipitates are affected by the lattice mismatch between the matrix and the γ' precipitates.

关键词： gh4742 superalloy γ'precipitate Solution cooling rate Aggregation Diffusion neck

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A Comparative Study of Various Flow Instability Criteria in Processing Map of superalloy gh4742

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Journal of Materials Science & Technology 2014年第3期30卷 217-222页

作者： Ge Zhou Hua Ding Furong Cao Beijiang Zhang College of Materials and Metallurgy Northeastern University High Temperature Materials Division Central Iron and Steel Research Institute

Hot compression tests were conducted on a Gleeble-1500D thermal simulating tester. Based on the deformation behavior and microstructural evolution of superalloy gh4742, different types of instability criteria of Prasad, Gegel, Malas, Murty and Semiatin were compared, and the physical significance of parameters was analyzed. Meanwhile, the processing maps with different instability criteria were obtained. It was shown that instability did not occur when average power dissipation rate was larger than 50% in the temperature range of 1020- 1130℃, corresponding to the strain rate range of 5 × 10-4-3.2 × 10-3 s-1. The domain is appropriate for the processing deformation of superalloy gh4742.

关键词： gh4742 superalloy Hot compression tests Flow instability criterion Processing map

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