Show/Hide Menu
Hide/Show Apps
Logout
Türkçe
Türkçe
Search
Search
Login
Login
OpenMETU
OpenMETU
About
About
Open Science Policy
Open Science Policy
Open Access Guideline
Open Access Guideline
Postgraduate Thesis Guideline
Postgraduate Thesis Guideline
Communities & Collections
Communities & Collections
Help
Help
Frequently Asked Questions
Frequently Asked Questions
Guides
Guides
Thesis submission
Thesis submission
MS without thesis term project submission
MS without thesis term project submission
Publication submission with DOI
Publication submission with DOI
Publication submission
Publication submission
Supporting Information
Supporting Information
General Information
General Information
Copyright, Embargo and License
Copyright, Embargo and License
Contact us
Contact us
Nondestructive investigation of the effect of quenching and tempering on medium-carbon low alloy steels
Date
2005-01-01
Author
Gür, Cemil Hakan
Metadata
Show full item record
This work is licensed under a
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License
.
Item Usage Stats
158
views
0
downloads
Cite This
The aim of the study is to investigate the effect of quenching and tempering on sound velocity of steels, and to contribute to the nondestructive control and optimisation of the quenching/tempering systems. Disk-shaped specimens were prepared from AISI/SAE 4140 and AISI/SAE 5140 steel bars. All specimens were austenised and quenched identically to eliminate the effect of grain size on sound velocity, and a constant tempering time was chosen. Microstructures of the samples were characterised by metallographic examinations and hardness measurements. The reference values were obtained for as-quenched and tempered structures by measuring sound velocities for both longitudinal and transversal waves. The sound velocity is lowest in the as-quenched martensite, and however, increases after tempering as a function of tempering temperature. The changes in sound velocity can be explained primarily by differences in the elastic modulus that is affected by the degree of lattice distortion and misorientation in the microstructure.
URI
https://hdl.handle.net/11511/50605
Journal
International Journal of Microstructure and Materials Properties
DOI
https://doi.org/10.1504/ijmmp.2005.008130
Collections
Department of Metallurgical and Materials Engineering, Article
Suggestions
OpenMETU
Core
Mathematical modelling of blood flow through arteries and investigation of some pathological cases in cardiovascular system using Grad-div stabilization
Kökten, İsmail Tahir; Kaya Merdan, Songül; Department of Mathematics (2019)
In this thesis, we investigate the grad-div stabilization method and its feasibility on the cardiovascular system. Governing equations on blood flow is chosen to be Navier-Stokes and numerical solution is obtained by Galerkin finite element approximation. Grad-div stabilization is known as an effective residual based stabilization method and no study exists about its effect on the cardiovascular system. In this thesis, we present a grad-div stabilized fully discrete scheme with backward Euler time discretiz...
Mathematical modeling of horizontal two-phase flow through fully eccentric annuli
Ömürlü, Çiğdem; Özbayoğlu, Evren; Department of Petroleum and Natural Gas Engineering (2006)
The primary objective of this study is to understand the mechanism, the hydraulics and the characteristics, of the two-phase flow in horizontal annuli. While achieving this goal, both theoretical and experimental works have been conducted extensively. The METU-PETE-CTMFL (Middle East Technical University, Petroleum and Natural Gas Engineering Department, Cuttings Transport and Multiphase Flow Laboratory) multiphase flow loop consists of 4.84 m long eccentric horizontal acrylic pipes having 0.1143m inner dia...
Numerical investigations on the hydrogen jet pressure variations in a strut based scramjet combustor
Suppandipillai, Jeyakumar; Kandasamy, Jayaraman; Sivakumar, R.; Karaca, Mehmet; Karthik, K. (2021-04-01)
Purpose – This paper aims to study the influences of hydrogen jet pressure on flow features of a strut-based injector in a scramjet combustor underreacting cases are numerically investigated in this study. Design/methodology/approach – The numerical analysis is carried out using Reynolds Averaged Navier Stokes (RANS) equations with the Shear Stress Transport k-v turbulence model in contention to comprehend the flow physics during scramjet combustion. The three major parameters such as the shock wave pattern...
Experimental investagation of drag reduction effects of polymer additives on turbulent pipe flow
Zeybek, Şerife; Uludağ, Yusuf; Department of Chemical Engineering (2005)
Since the discovery of the drag reduction effects of even small amount of macromolecules in solutions in turbulent pipe flows, there have been many experimental and theoretical studies in order to understand mechanisms behind this phenomenon. Theories have been proposed based on the observations on the change in the characteristics of the turbulent flow near the pipe wall where friction of the momentum transfer between the flow and the conduit takes place. In this study drag reduction in fully developed tur...
Incompressible flow simulations using least squares spectral element method on adaptively refined triangular grids
Akdağ, Osman; Sert, Cüneyt; Department of Mechanical Engineering (2012)
The main purpose of this study is to develop a flow solver that employs triangular grids to solve two-dimensional, viscous, laminar, steady, incompressible flows. The flow solver is based on Least Squares Spectral Element Method (LSSEM). It has p-type adaptive mesh refinement/coarsening capability and supports p-type nonconforming element interfaces. To validate the developed flow solver several benchmark problems are studied and successful results are obtained. The performances of two different triangular ...
Citation Formats
IEEE
ACM
APA
CHICAGO
MLA
BibTeX
C. H. Gür, “Nondestructive investigation of the effect of quenching and tempering on medium-carbon low alloy steels,”
International Journal of Microstructure and Materials Properties
, pp. 51–60, 2005, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/50605.