NDLI: Constitutive behavior and processing maps of low-expansion GH909 superalloy

Content Provider	Springer Nature Link
Author	Yao, Zhi hao Wu, Shao cong Dong, Jian xin Yu, Qiu ying Zhang, Mai cang Han, Guang wei
Copyright Year	2017
Abstract	The hot deformation behavior of GH909 superalloy was studied systematically using isothermal hot compression tests in a temperature range of 960 to 1040°C and at strain rates from 0.02 to 10 s$^{−1}$ with a height reduction as large as 70%. The relations considering flow stress, temperature, and strain rate were evaluated via power-law, hyperbolic sine, and exponential constitutive equations under different strain conditions. An exponential equation was found to be the most appropriate for process modeling. The processing maps for the superalloy were constructed for strains of 0.2, 0.4, 0.6, and 0.8 on the basis of the dynamic material model, and a total processing map that includes all the investigated strains was proposed. Metallurgical instabilities in the instability domain mainly located at higher strain rates manifested as adiabatic shear bands and cracking. The stability domain occurred at 960–1040°C and at strain rates less than 0.2 s$^{−1}$; these conditions are recommended for optimum hot working of GH909 superalloy.
Starting Page	432
Ending Page	443
Page Count	12
File Format	PDF
ISSN	16744799
Journal	International Journal of Minerals, Metallurgy, and Materials
Volume Number	24
Issue Number	4
e-ISSN	1869103X
Language	English
Publisher	University of Science and Technology Beijing
Publisher Date	2017-04-11
Publisher Place	Beijing
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	iron-based materials superalloys hot deformation constitutive equations processing maps microstructural evolution Materials Science Metallic Materials Characterization and Evaluation of Materials Ceramics, Glass, Composites, Natural Materials Surfaces and Interfaces, Thin Films Tribology, Corrosion and Coatings
Content Type	Text
Resource Type	Article
Subject	Materials Chemistry Mechanics of Materials Metals and Alloys Geochemistry and Petrology Mechanical Engineering

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