Determination of flow curves of the metastable austenite

Date

2014-09-01

Author

Şimşir, Caner
Davut, Kemal
Gür, Cemil Hakan

Metadata

Show full item record

Item Usage Stats

153
views

0
downloads

Thermo-mechanical properties of metastable austenite are significant parameters for the prediction of distortion and residual stresses by heat treatment simulations. Unfortunately, acquisition of thermo-mechanical properties of a metastable phase in the complete process temperature range requires special techniques and instrumentation. in this study, flow curves of metastable austenite of SAE 52100 (EN ıoOCr6) steel were characterized by special compression tests conducted on a deformation dilatometer in 300-850°C range. Since it is not possible to measure the flow curves of metastable austenite below martensite start (Mş) temperature by this method, the obtained data was extrapolated to room temperature in different ways. The validity of extrapolation scheme was justified by comparing of the extrapolated results with the results of a physically based material property calculation software.

Subject Keywords

Heat treatment, Simulation, Flow curve, Metastable austenite, SAE 52100, Isıl işlem, Simülasyon, Thermo-mekanik özellikler, Yan-kararlı östenit

URI

https://hdl.handle.net/11511/83734

Conference Name

17. Uluslararası Metalurji ve Malzeme Kongresi (2014)

Collections

Department of Metallurgical and Materials Engineering, Conference / Seminar

Suggestions

OpenMETU
Core

Assessment of flow and heat transfer characteristics for proposed solid density distributions in dilute laminar slurry upflows through a concentric annulus Eraslan, Ahmet Nedim (Elsevier BV, 2003-09-01) A computational model is developed to predict the hydrodynamic and heat transfer characteristics of dilute liquid-solid laminar upflows through a concentric annulus. The dilute slurry is treated as a single phase Newtonian fluid of locally variable physical and thermal properties. Available experimental data of radial solid density distributions in dilute water-feldspar annular upflows is used in the model. Various important characteristics of laminar slurry flows were successfully predicted. It was also sh...
Assessment of SLW-1 model in the presence of gray and non-gray particles Özen, Guzide; ATEŞ, CİHAN; Selçuk, Nevin; Külah, Görkem (2019-02-01) In this study, predictive accuracy of Gray Gas and SLW-1 approximations is benchmarked against Spectral Line-Based Weighted Sum of Grey Gases Model (SLW) in multidimensional enclosures involving gray/non-gray absorbing, emitting and scattering particles. Input data required for the radiation code and its validation are provided from two combustion tests previously carried out in a 300 kWt Atmospheric Bubbling Fluidized Bed Combustor (ABFBC) test rig burning low calorific value Turkish lignite with high vola...
Analysis of Transient Laminar Forced Convection of Nanofluids in Circular Channels Sert, İsmail Ozan; Sezer Uzol, Nilay; Güvenç Yazıcıoğlu, Almıla; Kakaç, Sadık (2012-11-15) In this study, forced convection heat transfer Characteristics of nanofluids are investigated by numerical analysis of incompressible transient laminar flow in a circular duct under step change in wall temperature and wall heat flux. The thermal responses of the system are obtained by solving energy equation under both transient and steady-state conditions for hydrodynamically fully developed flow. In the analyses, temperature dependent thermo-physical properties are also considered. In the numerical analys...
Calculation of the Dielectric Constant of a Ferroelectric Liquid Crystal From a Mean Field Model YURTSEVEN, HASAN HAMİT; Yurtseven, Hasan Hamit (2011-01-01) The static dielectric constant epsilon(perpendicular to) of the ferroelectric liquid crystal 4-(3-methyl-2-chlorobutanoyloxy)-4'--heptyloxybiphenyl (A7) with high spontaneous polarization is calculated as a function of temperature using a mean field model. This calculation is performed close to the smectic A-isotropic liquid (SmA-I) transition for pure optically active compound (T-c = 81.6 degrees C). For this calculation of epsilon(perpendicular to), the free energy of the SmA phase is expanded in terms of...
Analysis of thermomechanical cyclic behavior of unidirectional metal matrix composites Çöker, Demirkan; Nicholas, Theodore (1993-01-01) An analytical tool is developed to determine the three-dimensional stress state in a unidirectional composite subjected to axial loading and changes in temperature. A finite difference method is used to analyze a representative volume element of the composite which consists of concentric cylinders. The constituents are assumed to be elastic-plastic materials having temperature dependent properties. An iterative technique using the Prandtl-Reuss flow rule to determine incremental plastic strains is implement...

Citation Formats

C. Şimşir, K. Davut, and C. H. Gür, “Determination of flow curves of the metastable austenite,” İstanbul, Türkiye, 2014, p. 464, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/83734.