Determination of spot welding parameters of thick, heat treared sea 4140 steel parts

Tandoğan, A Bengü


Determination of isothermal Austenite Grain Growth model parameters for SAE 8620H Carburizing steel
Yıldız, Seçil; Yılmaz, Hasan; Yazır, Büşra; Evcil, Eilf; Şimşir, Caner; Davut, Kemal (null; 2016-12-01)
Carburizing treatments involve longer holdings at the austenite region, which can produce a range of different prior-austenite grain sizes (PAGS) depending on the growth behavior. The PAGS influences hardenability, phase transformation kinetics and hence the final phase fraction; and therefore the final mechanical properties. Since the high-temperature austenite structure is transformed during subsequent cooling steps, controlling the formation of desired austenitic structure during carburizing treatment is...
Determination of cracking related properties of engineering cementitious composites
Keskin, Süleyman Bahadır; Şahmaran, Mustafa; Yaman, İsmail Özgür (null; 2017-09-12)
Engineered Cementitious Composites (ECC) are relatively new types of fiber reinforced cementitious materials with enhanced mechanical properties such as tensile strain hardening accompanying high tensile strain capacity. This is mainly attributed to close and multiple cracks with widths remaining under 60 µm which contributes to durability of ECC material. These properties are only achievable as a result of a micro-mechanical design that requires special ingredients that make ECC costly to be used alone, ho...
Determination of mechanical properties of hybrid fiber reinforced concrete
Yurtseven, Alp Eren; Tokyay, Mustafa; Department of Civil Engineering (2004)
Fiber reinforcement is commonly used to provide toughness and ductility to brittle cementitious matrices. Reinforcement of concrete with a single type of fiber may improve the desired properties to a limited level. A composite is termed as hybrid, if two or more types of fibers are rationally combined to produce a composite that derives benefits from each of the individual fibers and exhibits a synergetic response. This study aims to characterize and quantify the mechanical properties of hybrid fiber reinfo...
Determination of absolute transport efficiencies of Be, Cd, In, Pb and Bi for electrothermal vaporization sample introduction into an inductively coupled plasma using an in-line electrostatic precipitator
Ertaş, Gülay (Elsevier BV, 2003-09-26)
A novel laboratory-constructed electrostatic precipitator for the determination of analyte transport efficiencies from a tube furnace electrothermal vaporization (ETV) sample introduction system is described. This simple experimental set up captures the analyte electrostatically using a negative corona discharge. The absolute transport efficiencies using experimental conditions typical of those applied to real analysis by ETV-ICP-MS were determined for Be, Cd, In, Pb and Bi to be 26 +/- 3, 39 +/- 8, 35 +/- ...
Determination of current transport characteristics in Au-Cu/CuO/n-Si Schottky diodes
Surucu, O. Bayrakli; Güllü, Hasan Hüseyin; Terlemezoglu, M.; Yildiz, D. E.; Parlak, M. (Elsevier BV, 2019-10-01)
In this study, the material properties of CuO thin films fabricated by sputtering technique and electrical properties of CuO/n-Si structure were reported. Temperature-dependent current-voltage (I-V) measurement was carried out to determine the detail electrical characteristics of this structure. The anomaly in thermionic emission (TE) model related to barrier height inhomogeneity at the interface was obtained from the forward bias I-V analysis. The current transport mechanism at the junction was determined ...
Citation Formats
A. B. Tandoğan, “Determination of spot welding parameters of thick, heat treared sea 4140 steel parts,” Middle East Technical University, 1998.