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Development of Constitutive Equation and Processing Maps for in706 alloy

Acta Metallurgica Sinica(English Letters) 2014年第2期27卷 198-204页

作者： Shuo Huang Lei Wang Xintong Lian Beijiang Zhang Guangpu Zhao Key lab for Anisotropy and Texture of Materials Northeastern University Department of High-temperature Materials Central Iron and Steel Research Institute

The hot deformation behavior of in706 has been investigated by means of hot compression tests in the temperature range of 900-1150℃ and strain rate range of 0.001-1 s^-1. The constitutive equation was developed on the basis of experimental data. Power dissipation efficiency （η） and instability parameter （4） maps were evaluated using the principles of the dynamic material model. Furthermore, the EBSD microstructure analysis was performed for validation, revealing that η was closely associated with the mechanism of dynamic recrystallization （DRX）. Microstructure transition map was composed of contour plots of η, 4, and DRX. The DRX domain zones and instable zones were identified in the processing map and were classified based on η. In a view of microstructure refinement and workability improvement, the optimum processing should be selected in the temperature range of 970-1025 ~C and the strain rate range of 0.08-0.01 s^-1.

关键词： in706 alloy Constitutive equation Power dissipation efficiency Flow instability Processing map

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Segregation of Phosphorus and Precipitation of MNP-Type Phosphide at the Grain Boundary of in706 Superalloy

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Journal of Materials Science & Technology 2017年第2期33卷 187-191页

作者： Sha Zhang Linjie Huang Anwen Zhang Lianxu Yu Xin Xin Wenru Sun Xiaofeng Sun Institute of Metal Research Chinese Academy of Sciences Jiangxi Province Key Laboratory of Polymer Preparation and Processing Shangrao Normal University

The effect of phosphorus content and heat treatment on the segregation of phosphorus and precipita- tion of phosphide at the grain boundary of in706 alloy has been investigated, The phosphide had a stoichiometry of MNP （M = Nb, Ti and N = Ni, Fe, Cr） and an orthorhombic crystal structure. The solubil- ity of phosphorus in the grain matrix of in706 alloy was determined to be between 0.008% and 0.013%. When soaked at 980 ℃ for 5 min, the phosphide was noticeably precipitated at grain boundaries with the grain size unchanged. When soaked at 980 ℃ for 3 h, the grains grew significantly, but the phos- phide stayed at original grain boundaries which outlined the grain shape before soaking. Soaking at 1060 ℃ for 2 h fully dissolved the pre-existing phosphide but phosphorus atoms were not distributed uni- formly in the grain matrix. When the holding time at 1060 ℃ was extended to 10 h, the phosphorus atoms were distributed uniformly in the grain matrix by sufficient diffusion, and the phosphide could only be formed at grain boundaries during the 980 ℃ soaking. The precipitation of phosphide mainly relied on the phosphorus segregation which was built up by diffusion.

关键词： Phosphorus Phosphide in706 alloy Grain boundary segregation

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