Microstructural evolution and mechanical properties of solution annealed cast IN617B alloy during long-term thermal exposure

2017 ◽  
Vol 704 ◽  
pp. 302-310 ◽  
Author(s):  
Shuang Gao ◽  
Jieshan Hou ◽  
Yongan Guo ◽  
Lanzhang Zhou
Keyword(s):  
Mechanical Properties ◽  
Microstructural Evolution ◽  
Thermal Exposure

Mechanical Properties of Epoxy Adhesive Under Thermal Aging and Their Chemical Degradation Behavior

2021 ◽  
Vol 21 (8) ◽  
pp. 4444-4449
Author(s):  
Bongjin Chung ◽  
Shin Sungchul ◽  
Jaeho Shim ◽  
Seongwoo Ryu
Keyword(s):  
Mechanical Properties ◽  
Thermal Aging ◽  
Photoelectron Spectroscopy ◽  
Thermal Exposure ◽  
Chain Scission ◽  
Epoxy Adhesive ◽  
Chemical Degradation ◽  
Adhesive Properties ◽  
Noticeable Reduction

Epoxy adhesive was analyzed under long term thermal aging and mechanical properties and chemical degradation were observed by X-ray photoelectron spectroscopy (XPS). Long term thermal exposure of epoxy causes a noticeable reduction in adhesive properties. We developed a predictive model of temperature and time dependent aging. The temperature dependent aging behavior of epoxy adhesive shows good agreement with conventional Arrhenius equations. Using XPS analysis, we also discovered a correlation between chemical degradation and the adhesive properties. Decay of C–C bonding ratio induced chain-scission of epoxy adhesive; increase of total numbers of C–O and C═O induced oxidation of epoxy adhesive during thermal exposure.

EVOLUTIONS OF MICROSTRUCTURES AND MECHANICAL PROPERTIES OF TWO CAST Ni--BASED SUPERALLOYS DURING LONG--TERM THERMAL EXPOSURE

2010 ◽  
Vol 2010 (2) ◽  
pp. 213-220 ◽  
Author(s):  
Xuezhi QIN ◽  
Jianting GUO ◽  
Chao YUAN ◽  
Jieshan HOU ◽  
Lanzhang ZHOU ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Exposure ◽  
Microstructures And Mechanical Properties

Influence of Fe Content on Microstructure and Mechanical Properties of GH984 Alloy

2015 ◽  
Vol 816 ◽  
pp. 540-545
Author(s):  
Chang Shuai Wang ◽  
Ting Ting Wang ◽  
Mei Lin Tan ◽  
Yong An Guo ◽  
Jian Ting Guo ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Structural Stability ◽  
Rupture Life ◽  
Thermal Exposure ◽  
Major Constituent ◽  
Microstructure And Mechanical Properties ◽  
Fe Content ◽  
Tcp Phase ◽  
The Cost

GH984 is an economic alloy due to the elimination of Co and its containing more than 20% Fe. As a major constituent of GH984 alloy, the Fe reduces the cost, but promotes the precipitation of TCP phase. In order to get an optimum alloy with desired balance among structural stability, mechanical properties and cost, the influence of Fe content on microstructure and mechanical properties of GH984 alloy was investigated in this paper. The results showed that the Fe content had no obvious influence on the major precipitates which were spherical γ′, blocky MC and discrete M23C6 at grain boundary after standard heat treatment, except the γ/γ ́ misfit. However, during long-term thermal exposure at 750°C, the decrease of the Fe content retarded the precipitation of η phase and enhanced the structural stability. The Fe content had no obvious influence on the tensile strength and ductility. At condition of 700°C/400MPa, the rupture life had not evident change, but the elongation decreased, the fractural model exhibited mix-fracture model and the characteristics of intergranular fracture became obvious with increasing the Fe content. It can be concluded that the decrease of Fe content can improve the structural stability and ductility.

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