Application of Differential Transform Method for Estimating Thermal Cycle Developed in GTA Welding of High Carbon Steel Joints

2015 ◽  
Vol 14 ◽  
pp. 37-48
Author(s):  
Jaideep Dutta ◽  
S. Narendranath ◽  
Aleksandr Zhilin
Keyword(s):  
Heat Flux ◽  
Temperature Distribution ◽  
Carbon Steel ◽  
Cooling Rate ◽  
High Carbon Steel ◽  
Differential Transform Method ◽  
Temperature Cycle ◽  
High Carbon ◽  
Transform Method ◽  
Differential Transform

This article reveals a detailed study of temperature cycle formed during Gas Tungsten Arc welding of high carbon steel (AISI 1090) butt joints. Experimental work has been carried out to estimate the temperature distribution along fusion boundary to longitudinal direction of the weldment by mounting thermocouples on the plate along with Data Acquisition System. Heat flux distribution due to moving point heat source has been demonstrated by implementing Gaussian surface heat flux and Angular Torch model. Cooling rate has predicted by application of Adams cooling rate equation. Conduction-convection phenomena plays dominant role for evaluating heat loss from the weld joint and Differential Transform Method (DTM) has been applied to judge non-dimensional temperature distribution. Analytical studies has shown well agreement with experimental temperature distribution.

The Mould Flux Heat Conduction Performance Designing of High Carbon Steel for Thin Slab Continuous Casting

2014 ◽  
Vol 1033-1034 ◽  
pp. 1313-1316
Author(s):  
Hui Rong Li ◽  
Li Gen Sun ◽  
Li Qun Ai
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Carbon Steel ◽  
Continuous Casting ◽  
Orthogonal Experiment ◽  
High Carbon Steel ◽  
Thin Slab ◽  
High Carbon ◽  
Slab Continuous Casting ◽  
Mould Flux

Heat transfer of the mould flux between the mould and the strand is very complicated, especially for the high carbon steel thin slab continuous casting. In this research the orthogonal experiment has been carried out, and the results showed that: the effect for the heat flux form strong to weak is: R>Na2O>F>MgO>BaO. and in the experiment range, with the R increasing, when the R, Na2O content and the F- content are increasing, the heat flux would be decreasing; with the MgO content increasing, the crystallization temperature would getting fluctuant; with the BaO content increasing, the heat flux would getting fluctuant, when its content is around 6%, the heat flux is reach its summit.

scholarly journals Investigating the cooling rate of cane molasses as quenching medium for 0.61% C high carbon steels

10.30544/139 ◽  
2016 ◽  
Vol 22 (1) ◽  
pp. 39-50 ◽  
Author(s):  
M. R. Dodo ◽  
E. T Dauda ◽  
M. A. Adamu
Keyword(s):  
Carbon Steel ◽  
Cooling Rate ◽  
High Carbon Steel ◽  
Good Alternative ◽  
Carbon Steels ◽  
Engine Oil ◽  
Test Results ◽  
High Carbon ◽  
Cane Molasses ◽  
Quenching Medium

The effect of cooling rate of cane molasses as quenching medium for 0.61% C high carbon steels was investigated. Samples of high carbon steel were spheroidized annealed and then machined prior to the hardening process. Molasses solution of viscosity equals to that of engine oil was prepared by adding water. The samples were normalized and then austenitised at 800oC and soaked for 40 minutes and then quenched in water, engine oil, raw molasses and the prepared molasses solution. Cooling rate curves of all the quenching media used were developed. The highest cooling rate of 60oC/s was attained by the prepared molasses solution. Hardness of the test samples was evaluated. The test results obtained show that the highest hardness value (525 HVN) was obtained from the sample quenched in the prepared molasses solution. Microstructures of the various samples were analyzed using OM and SEM. In all the tests samples martensite structure was observed. It was observed that the prepared molasses solution has higher severity of quenching than that of engine oil but lower than that of water. The research showed that cane molasses can harden high carbon steel without cracking the component in the same way as engine oil, hence, molasses could be a very good alternative to engine oil for use as quenching medium.

Semi-analytical treatments of conjugate heat transfer

2012 ◽  
Vol 227 (3) ◽  
pp. 492-503 ◽  
Author(s):  
Mohammad Reza Hajmohammadi ◽  
Seyed Salman Nourazar ◽  
Ali Habibi Manesh
Keyword(s):  
Heat Transfer ◽  
Differential Equation ◽  
Temperature Distribution ◽  
Decomposition Method ◽  
Conjugate Heat Transfer ◽  
Adomian Decomposition Method ◽  
Differential Transform Method ◽  
Transform Method ◽  
Adomian Decomposition ◽  
Differential Transform

A new algorithm is proposed based on semi-analytical methods to solve the conjugate heat transfer problems. In this respect, a problem of conjugate forced-convective flow over a heat-conducting plate is modeled and the integro-differential equation occurring in the problem is solved by two lately-proposed approaches, Adomian decomposition method and differential transform method. The solution of the governing integro-differential equation for temperature distribution of the plate is handled more easily and accurately by implementing Adomian decomposition method/differential transform method rather than other traditional methods such as perturbation method. A numerical approach is also performed via finite volume method to examine the validity of the results for temperature distribution of the plate obtained by Adomian decomposition method/differential transform method. It is shown that the expressions for the temperature distribution in the plate obtained from the two methods, Adomian decomposition method and differential transform method, are the same and show closer agreement to the results calculated from numerical work in comparison with the expression obtained by perturbation method existed in the literature.

Welding of High Carbon Steel without Transformation

2007 ◽  
Vol 345-346 ◽  
pp. 1411-1415 ◽  
Author(s):  
Hidetoshi Fujii ◽  
Ling Cui ◽  
Kiyoshi Nogi
Keyword(s):  
Tensile Strength ◽  
Carbon Steel ◽  
Ultimate Tensile Strength ◽  
Cooling Rate ◽  
High Carbon Steel ◽  
The Other ◽  
High Carbon ◽  
Friction Stir ◽  
Joint Properties ◽  
Proof Strength

A high carbon steel joint, S70C (0.72wt%C) was successfully friction stir welded without any postheat treatments. There are two methods for obtaining proper joint properties. The first method is to decrease the peak temperature to below A1, and the other method to decrease the cooling rate to less than the lower critical cooling rate. As a result, the ultimate tensile strength of 1214 MPa, 0.2 % proof strength of 700 MPa and elongation of 40% were obtained for a joint.

scholarly journals Homogeneous–heterogeneous reaction mechanism on MHD carbon nanotube flow over a stretching cylinder with prescribed heat flux using differential transform method

2020 ◽  
Vol 7 (3) ◽  
pp. 337-351 ◽  
Author(s):  
Shib Sankar Giri ◽  
Kalidas Das ◽  
Prabir Kumar Kundu
Keyword(s):  
Carbon Nanotubes ◽  
Heat Flux ◽  
Heterogeneous Reaction ◽  
Differential Transform Method ◽  
Stretching Cylinder ◽  
Multiwalled Carbon ◽  
Heterogeneous Chemical Reaction ◽  
Transform Method ◽  
Differential Transform ◽  
Walled Carbon Nanotubes

Abstract Hydromagnetic nanofluid flow through an incompressible stretching cylinder accompanying with homogeneous–heterogeneous chemical reaction has been executed in current literature. SWCNTs (single-walled carbon nanotubes) and MWCNTs (multiwalled carbon nanotubes) as nanoparticles in appearance of prescribed heat flux are accounted here. Leading equations of the assumed model have been normalized through similarity practice and succeeding equations resolved numerically by spending RK-4 shooting practice and analytically by engaging differential transform method. The impulse of promising flow constraints on the flow characteristic is finalized precisely through graphs and charts. We perceived that velocity outlines and temperature transmission are advanced in MWCNT than SWCNT in every case.

scholarly journals Effects of austenizing temperature, cooling rate and isothermal temperature on overall phase transformation characteristics in high carbon steel

2020 ◽  
Vol 9 (6) ◽  
pp. 15286-15297
Author(s):  
Zeinab Babasafari ◽  
Alexey V. Pan ◽  
Farshid Pahlevani ◽  
Rumana Hossain ◽  
Veena Sahajwalla ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Carbon Steel ◽  
Cooling Rate ◽  
High Carbon Steel ◽  
High Carbon ◽  
Isothermal Temperature
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