Investigation of fatigue behavior of a high strength lower bainitic structure in 60SIMN5 steel via a modified testing method

Download

index.pdf

Date

2019

Author

Uluğ, Emirhan

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

186
views

120
downloads

A steel with high silicon content can yield carbide-free bainite after an isothermal bainitic transformation. In this thesis study, fatigue behavior of a high strength carbide-free lower bainitic structure, which was produced from 60SiMn5 steel, was investigated. The fatigue tests of the same steel with tempered martensitic microstructure were also carried out for comparison purposes. Before fatigue testing, the mechanical properties of the specimens were also determined, which include hardness, yield strength, tensile strength and modulus of elasticity. The fatigue tests were performed on the fatigue specimens, which have rectangular cross sections, under single amplitude loading (stress ratio, R = 0) using bending fatigue mechanism. In accordance with this purpose, a new fatigue test machine and a new type fatigue specimen were designed. The design of the fatigue specimen was based on ASTM B 593 – 96 Standard, and the design of Krouse-type fatigue specimen in the standard was revised via numerical analyses according to the mechanical properties of the specimens to be tested. S-N curves and fractographic investigations of the fatigue specimens were used while comparing fatigue behaviors of the structures. It has been observed that there is no clear difference between the fatigue lives and endurance limits of lower bainitic and tempered martensitic fatigue specimens as most commonly vi observed for high strength bainitic and martensitic structures in literature. It has been demonstrated that bending fatigue application, in ASTM B 593 – 96 Standard, is also applicable to high strength steels by revising Krouse-type specimen specified in the standard.

Subject Keywords

High Strength Lower Bainite, 60SiMn5 Steel, High Strength Lower Bainite, High Strength Tempered Martensite, High Cycle Fatigue, Bending Fatigue Test.

URI

http://etd.lib.metu.edu.tr/upload/12624925/index.pdf
https://hdl.handle.net/11511/45176

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Measurement of anisotropic flow in XeXe collisions at 5.44 TeV with the CMS experiment Stojanovic, Milan; et. al. (Elsevier BV, 2019-02-01) New measurements of anisotropic flow in XeXe collisions at a center-of-mass energy of 5.44 TeV per nucleon pair, collected by the CMS experiment at the LHC, are presented. The v(2), v(3) and v(4) Fourier coefficients of the anisotropic azimuthal distribution are obtained employing three different analysis techniques: two-particle correlations, the scalar product method, and multiparticle cumulants, which have different sensitivities to non-flow and flow fluctuation effects. The results are shown as a functi...
Measurement of residual stress in air plasma-sprayed Y2O3-ZrO2 thermal barrier coating system using micro-Raman spectroscopy Tanaka, Makoto; Hasegawa, Makoto; Dericioğlu, Arcan Fehmi; Kagawa, Yutaka (2006-03-15) Residual stress in air plasma-sprayed Y2O3 stabilized ZrO2 thermal barrier coating (TBC) has been measured using micro-Raman spectroscopy. The frequency shift of Raman peak from tetragonal phase (approximate to 640 cm(-1)) is used for determination of local stress in TBC. The relation between Raman peak shift and applied uniaxial stress is measured using a freestanding specimen. The relation is used to determine actual residual stress of the TBC layer coated on a stainless steel substrate. The uniaxial stre...
Observation of prompt J/psi meson elliptic flow in high-multiplicity pPb collisions at root s(NN)=8.16 TeV Sirunyan, A. M.; et. al. (Elsevier BV, 2019-04-01) A measurement of the elliptic flow (v(2)) of prompt J/psi mesons in high-multiplicity pPbcollisions is reported using data collected by the CMS experiment at a nucleon-nucleon center-of-mass energy root s(NN)= 8.16 TeV. Prompt J/psi mesons decaying into two muons are reconstructed in the rapidity region in the nucleon-nucleon center-of-mass frame (y(cm)), corresponding to either -2.86 < y(cm) < -1.86 or 0.94 < y(cm)< 1.94. The average v(2) result from the two rapidity ranges is reported over the transverse ...
Effect of synthetic fibers on flexural performance of normal and high performance concrete Şengün, Emin; Alam, Burhan; Yaman, İsmail Özgür (null; 2016-09-19) Macro synthetic fiber incorporated concretes are increasingly used for concrete applications owing to their high energy absorption capacity, toughness and impact resistance. The aim of this study is twofold; first to investigate the effects of synthetic fibers on the flexural performance and thus the energy absorption characteristics of normal and high performance concrete (HPC), and secondly to investigate the effects of specimen size. For this experimental study, eight concrete groups were designed using ...
Observation of long-range, near-side angular correlations in pPb collisions at the LHC Chatrchyan, S.; et. al. (Elsevier BV, 2013-01-01) Results on two-particle angular correlations for charged particles emitted in pPb collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV are presented. The analysis uses two million collisions collected with the CMS detector at the LHC. The correlations are studied over a broad range of pseudorapidity, eta, and full azimuth, phi, as a function of charged particle multiplicity and particle transverse momentum, p(T). In high-multiplicity events, a long-range (2 < vertical bar Delta eta vertical bar...

Citation Formats

E. Uluğ, “Investigation of fatigue behavior of a high strength lower bainitic structure in 60SIMN5 steel via a modified testing method,” Thesis (M.S.) -- Graduate School of Natural and Applied Sciences. Metallurgical and Materials Engineering., Middle East Technical University, 2019.