Effect of Cold Deformation on Microstructure and Mechanical Behavior of Ni-based High Temperature Alloy GH3535

doi:10.11901/1005.3093.2014.617

Chinese Journal of Materials Research

2015, Vol. 29

Issue (6): 439-444 DOI: 10.11901/1005.3093.2014.617

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Effect of Cold Deformation on Microstructure and Mechanical Behavior of Ni-based High Temperature Alloy GH3535

Jinhui FAN¹,Kexin CHEN^1,^2,³,Jianping LIANG^2,^3,^**(

),Zhijun LI^2,³,Xiaoke LI^2,³

1. College of Mechanical Engineering, Donghua University, Shanghai 201620, China
2. Shanghai Institute of Applied Physics, Chinese Academy of Sciences , Shanghai 201800, China
3. Key Laboratory of Nuclear Radiation and Nuclear Energy Technology, Chinese Academy of Sciences,

Cite this article:

Jinhui FAN,Kexin CHEN,Jianping LIANG,Zhijun LI,Xiaoke LI. Effect of Cold Deformation on Microstructure and Mechanical Behavior of Ni-based High Temperature Alloy GH3535. Chinese Journal of Materials Research, 2015, 29(6): 439-444.

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Abstract

The effect of extensometer induced cold-tesile deformation on microstructure and mechanical properties of Ni-based high temperature alloy GH3535 were investigated by means of OM and TEM as well as measurement of true stress-true stain curves. It was found that GH3535 alloy shows characteristics of strong work hardening; cold deformation can result in significant increase of its strength and hardness, whereas decrease of its ductility. With the increase of deformation degree grains were elongated along the deformation direction and twins became profusely lager. The work hardening kinetics of GH3535 alloy is constant with Ludwigson model, dislocation slipping and twin are the main deformation mechanism. With the increase of deformation degree the slip behavior of dislocations changes from single slip to cross slip. When the deformation degree below 30% the work hardening is mainly caused by the dislocation long-range stress field and twin, conversely, for the deformation degree above 30% work hardening is mainly caused by the dislocation short-range stress field and deformation twin.

Key words: metallic materials nickel-based superalloy cold deformation microstructure mechanical property

Received: 24 October 2014

Fund: ^*Supported by the Program of International S&T Cooperation, ANSTO-SINAP No. 2014DFG60230, National Natural Science Foundation of China Nos. 51371188 & 51371189, and Strategic Priority Research Program of the Chinese Academy of Science No. XD02004210.

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	Jinhui FAN
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	Xiaoke LI

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https://www.cjmr.org/EN/10.11901/1005.3093.2014.617 OR https://www.cjmr.org/EN/Y2015/V29/I6/439

Fig.1 Microstructures of samples with different cold deformation degree (a) 0%, (b) 4%, (c) 7%, (d) 10%, (e) 20%, (f) 30%, (g) 40%

Fig.2 True stress-true stain curves of samples with different cold deformation degree

Fig.3 Mechanical properties of samples with different cold deformation degree

Fig.4 Hardness of different material with different cold deformation degree

Fig.5 lg-lg scale true stress vs true stain curves of samples with different cold deformation degree

Table 1 Ludwigson regression results of samples with different cold deformation degree

Fig.6 TEM micrographs of samples with different cold deformation degree (a) 0%, (b) 7%, (c) 20%, (d) 20%, (e) 40%

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