Creep Damage Evaluation of DS CM247 Nickel Base Superalloy Using Alternate Current Potential Drop Technique

2015 ◽  
Vol 69 (2) ◽  
pp. 241-245 ◽  
Author(s):  
C. M. Omprakash ◽  
B. Srivathsa ◽  
M. Kamaraj ◽  
D. V. V. Satyanarayana
Keyword(s):  
Creep Damage ◽  
Alternate Current ◽  
Potential Drop ◽  
Nickel Base Superalloy ◽  
Damage Evaluation ◽  
Nickel Base ◽  
Drop Technique ◽  
Current Potential ◽  
Base Superalloy

scholarly journals Damage Evaluation Based on EBSD Method for Nickel-Base Superalloy Notched Specimen Under Creep and/or Fatigue Conditions

2015 ◽  
Vol 64 (2) ◽  
pp. 113-119
Author(s):  
Daisuke KOBAYASHI ◽  
Masamichi MIYABE ◽  
Masahiro ACHIWA ◽  
Ruji SUGIURA ◽  
A. Toshimitsu. YOKOBORI Jr.
Keyword(s):  
Nickel Base Superalloy ◽  
Damage Evaluation ◽  
Notched Specimen ◽  
Nickel Base ◽  
Ebsd Method ◽  
Base Superalloy

129 The creep damage analysis harmonizing macroscopic mechanics with vacancy diffusion analysis for single crystal nickel-base superalloy

2013 ◽  
Vol 2013.48 (0) ◽  
pp. 60-61
Author(s):  
Yuki Tahara ◽  
A. Toshimitsu Yokobori Jr ◽  
Yoshiko Nagumo ◽  
Toshihito Ohmi ◽  
Akira Ishida ◽  
...  
Keyword(s):  
Single Crystal ◽  
Creep Damage ◽  
Nickel Base Superalloy ◽  
Damage Analysis ◽  
Vacancy Diffusion ◽  
Diffusion Analysis ◽  
Nickel Base ◽  
Base Superalloy

Strain and Damage-Based Analytical Methods to Determine the Kachanov–Rabotnov Tertiary Creep-Damage Constants

2011 ◽  
Vol 21 (8) ◽  
pp. 1186-1201 ◽  
Author(s):  
Calvin M. Stewart ◽  
Ali P. Gordon
Keyword(s):  
Creep Behavior ◽  
Creep Deformation ◽  
Analytical Methods ◽  
Numerical Optimization ◽  
Creep Damage ◽  
Tertiary Creep ◽  
Nickel Base Superalloy ◽  
Trial And Error ◽  
Nickel Base ◽  
Base Superalloy

In the power generation industry, the goal of increased gas turbine efficiency has led to increased operating temperatures and pressures necessitating nickel-base superalloy components. Under these conditions, the tertiary creep regime can become the dominant form of creep deformation. In response, the classical Kachanov–Rabotnov coupled creep-damage constitutive model is often used to predict the creep deformation and damage of Ni-base superalloys. In this model, the secondary creep behavior can be determined through analytical methods while the tertiary creep behavior is often found using trial and error or numerical optimization. Trial and error may produce no constants. Numerical optimization can be computationally expensive. In this study, a strain-based and damage-based approach to determine the tertiary creep behavior of nickel-base superalloys has been developed. Analytically determined constants are found for a given nickel-base superalloy. Creep deformation and damage evolution curves are compared. Methods to deal with stress dependence are introduced and studied.

Application of Potential Drop Technique to the Inspection of Welded Boiler Pressure Parts

2004 ◽  
Author(s):  
Seiichi Hamada ◽  
Yasuki Ogawa ◽  
Hideo Iida ◽  
Tomoki Kuroiwa ◽  
Masahiko Kuroki ◽  
...  
Keyword(s):  
Direct Current ◽  
Electrical Potential ◽  
Creep Damage ◽  
Potential Drop ◽  
Burst Test ◽  
Technical Requirements ◽  
Pulsed Direct Current ◽  
Drop Technique ◽  
Direct Current Potential Drop ◽  
Current Potential

In this paper, a practical method using the electrical potential drop technique was discussed to evaluate the creep damage accumulated in the welded power piping such as main steam pipe and hot reheat pipe. Round robin experimental measurements conducted by the authors et al. as academic activities in the Japanese Society for Non-destructive Inspection showed that the potential drop technique is effective for the application to the inspection of welded boiler pressure parts. The authors have conducted additional experimental and numerical studies for verification focusing on the application of the pulsed direct current potential drop technique. The authors have proposed technical requirements on the potential drop technique for the application to the inspection of welded power piping to be implemented in JSME Codes for Thermal Power Generation Facilities (2003 Edition) as a non-mandatory appendix JA. And the practical on-line measurement in the high temperature and high pressure burst test using the repair-welded power piping has been conducted. In this burst test, Tokyo Electric Power Company has tried to monitor the creep damage accumulated in the seam-welded area using the commercialized tool based on pulsed direct current potential drop technique.

Low Cycle Fatigue of the Single-Crystal Nickel-Base Superalloy CMSX-4 — Anistropy and Effect of Creep Damage*

2009 ◽  
Vol 51 (5) ◽  
pp. 291-294
Author(s):  
Hellmuth Klingelhöffer ◽  
Alexander Epishin ◽  
Thomas Link
Keyword(s):  
Single Crystal ◽  
Low Cycle Fatigue ◽  
Creep Damage ◽  
Nickel Base Superalloy ◽  
Cycle Fatigue ◽  
Nickel Base ◽  
Base Superalloy

scholarly journals Damage evaluation of Inconel 738LC nickel-base superalloy in creep-fatigue.

1990 ◽  
Vol 39 (440) ◽  
pp. 522-528 ◽  
Author(s):  
Hiroaki IBUCHI ◽  
Hirofumi KIMURA ◽  
Masao SAKANE ◽  
Masateru OHNAMI ◽  
Masamitsu MURAMATSU ◽  
...  
Keyword(s):  
Nickel Base Superalloy ◽  
Damage Evaluation ◽  
Creep Fatigue ◽  
Nickel Base ◽  
Inconel 738Lc ◽  
Base Superalloy

Dependence of Intergranular Fracture on Boundary Topography and Cohesion

1973 ◽  
Vol 31 ◽  
pp. 150-151
Author(s):  
J. E. Doherty ◽  
A. F. Giamei ◽  
B. H. Kear ◽  
C. W. Steinke
Keyword(s):  
Grain Boundary ◽  
Room Temperature ◽  
Nickel Base Superalloy ◽  
Boundary Shear ◽  
Room Temperature Ductility ◽  
Solid Solution Matrix ◽  
Nickel Base ◽  
Solution Matrix ◽  
Different Levels ◽  
Base Superalloy

Recently we have been investigating a class of nickel-base superalloys which possess substantial room temperature ductility. This improvement in ductility is directly related to improvements in grain boundary strength due to increased boundary cohesion through control of detrimental impurities and improved boundary shear strength by controlled grain boundary micros true tures.For these investigations an experimental nickel-base superalloy was doped with different levels of sulphur impurity. The micros tructure after a heat treatment of 1360°C for 2 hr, 1200°C for 16 hr consists of coherent precipitates of γ’ Ni3(Al,X) in a nickel solid solution matrix.

Characterization of Coherent, Ordered Precipitates in Nickel-Base Alloys

1973 ◽  
Vol 31 ◽  
pp. 144-145
Author(s):  
B. H. Kear ◽  
J. M. Oblak
Keyword(s):  
Stable Phase ◽  
Nickel Base Superalloy ◽  
Alloy 718 ◽  
Commercial Alloy ◽  
Precipitate Morphology ◽  
Continuous Precipitation ◽  
Nickel Base ◽  
Base Superalloy ◽  
Strengthening Precipitate

A nickel-base superalloy is essentially a Ni/Cr solid solution hardened by additions of Al (Ti, Nb, etc.) to precipitate a coherent, ordered phase. In most commercial alloy systems, e.g. B-1900, IN-100 and Mar-M200, the stable precipitate is Ni3 (Al,Ti) γ′, with an LI2structure. In A lloy 901 the normal precipitate is metastable Nis Ti3 γ′ ; the stable phase is a hexagonal Do2 4 structure. In Alloy 718 the strengthening precipitate is metastable γ″, which has a body-centered tetragonal D022 structure.Precipitate MorphologyIn most systems the ordered γ′ phase forms by a continuous precipitation re-action, which gives rise to a uniform intragranular dispersion of precipitate particles. For zero γ/γ′ misfit, the γ′ precipitates assume a spheroidal.

Sign in / Sign up

Export Citation Format

Share Document