Transformation Plasticity and the Effect on Quenching Process Simulation

2007 ◽  
Vol 345-346 ◽  
pp. 915-918 ◽  
Author(s):  
Tatsuo Inoue ◽  
Tomohiro Tanaka ◽  
Dong Ying Ju ◽  
Ryuji Mukai
Keyword(s):  
Constitutive Equation ◽  
Continuum Mechanics ◽  
Process Simulation ◽  
Testing Machine ◽  
Chromium Steel ◽  
Functional Testing ◽  
Transformation Plasticity ◽  
Material Data ◽  
Quenching Process ◽  
Simulated Distribution

Mechanism of transformation plasticity (TP) is discussed from continuum mechanics viewpoint, and derivation of TP law from the unified thermo-mechanical and transformation plasticity constitutive equation. Result of identified TP coefficient for a chromium steel (JIS SCr420) by use of multi-functional testing machine is introduced as one of the material data together with other data to the simulation of a quenching process by use of newly developed code COSMAP. The simulated distribution of temperature, phases and stress/distortion are compared with the experimentally measured values to verify the accuracy.

Numerical Analysis on Heat Transfer Coefficient of Large Die Steel Quenching

2012 ◽  
Vol 487 ◽  
pp. 449-452
Author(s):  
Xin Xiao Bian ◽  
Chao Zhang ◽  
Lin Zhu Qian
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Process Simulation ◽  
Air Cooling ◽  
Empirical Equations ◽  
Surface Conditions ◽  
Die Steel ◽  
Quenching Process ◽  
The Heat Transfer Coefficient

Heat transfer coefficient is one of the most important boundary conditions for quenching process simulation. It depends on many factors, such as material, size, surface conditions of a part, and so on. It is, therefore, difficult to evaluate the heat transfer coefficient accurately. T In the environment for large modules P20 and the actual heat transfer conditions, the off-line air-cooling heat transfer coefficient of C are simulated by using empirical equations.

Heat transfer coefficients for quenching process simulation

2004 ◽  
Vol 120 ◽  
pp. 269-276
Author(s):  
M. Maniruzzaman ◽  
R. D. Sisson
Keyword(s):  
Heat Transfer ◽  
Boundary Condition ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Process Simulation ◽  
Nucleate Boiling ◽  
Film Boiling ◽  
Transfer Coefficients ◽  
Heat Transfer Coefficients ◽  
Quenching Process

Quenching heat treatment in a liquid medium is a very complex heat transfer process. Heat extraction from the part surface occurs through several different heat transfer mechanisms in distinct temperature ranges, namely, film boiling, partial film boiling (i.e. transition), nucleate boiling and convection. The maximum heat transfer occurs during the nucleate boiling stage. Experimental study shows that, the effective surface heat transfer coefficient varies more than two orders of magnitude with the temperature during the quenching. For quenching process simulation, accurate prediction of the time-temperature history and microstructure evolution within the part largely depends on the accuracy of the boundary condition supplied. The heat transfer coefficient is the most important boundary condition for process simulation. This study focuses on creating a database of heat transfer coefficients for various liquid quenchant-metallic alloy combinations through experimentation using three different quench probes. This database is a web-based tool for use in quench process simulation. It provides at-a-glance information for quick and easy analysis and sets the stage for a Decision Support System (DSS) and Data Mining for heat-treating process.

Determining the Anisotropy Coefficients of an Ultra Fine Grained Al6082 Alloy Subjected to ECAP

2007 ◽  
Vol 537-538 ◽  
pp. 215-222
Author(s):  
György Krállics ◽  
Arpad Fodor
Keyword(s):  
Constitutive Equation ◽  
Yield Stress ◽  
Continuum Mechanics ◽  
Equivalent Stress ◽  
Strain Curve ◽  
Equivalent Strain ◽  
Rigid Plastic ◽  
Fine Grained ◽  
Anisotropy Coefficients

Bulk Al6082 alloy is subjected to ECAP using route Bc. This paper focuses on the determination of the anisotropy coefficients and equivalent stress-equivalent strain curve using continuum mechanics equations. Assuming the material to be rigid-plastic, the parameters of the constitutive equation are determined with the aid of measuring the deformation and the uniaxial yield stress during upsetting tests in three perpendicular directions.

scholarly journals Design and Production of Rotary Type Machine for Chop Up Organic Waste Plantation

2018 ◽  
Vol 248 ◽  
pp. 01010
Author(s):  
Wenny Marthiana ◽  
Duskiardi ◽  
Rizky Arman ◽  
Yovial Mahyoedin ◽  
Dedi Wardiyanto
Keyword(s):  
Organic Waste ◽  
Testing Machine ◽  
Production Capacity ◽  
Transmission System ◽  
Functional Testing ◽  
Cutting Mechanism ◽  
Machine Elements ◽  
Type Machine ◽  
Rice Stalks ◽  
Rotary Type

Agricultural organic waste chopping machine are tools that can be used to chop leaves, twigs and could be used to help farmers in processing of the agricultural disposal products such as stalks and corn stalks, cassava stems, rice stalks in order to accelerate farmers in processing of those disposal in order that the plantation land can be prepared immediately for subsequent cultivation, as well as the chopped products can be reused for various purposes such as animal feeds and composts fertilizer. The research of this engineering method is carried out with the following stages: (1) study of the characteristics of several organic wastes to be enumerated, (2) analysis of the Chopping machine elements, consists of Chopping Blades, the house of the chopper blades, hopper, frame and transmission system. (3) A Prototype chop up mechanism manufacturing. And (4) Functional testing machine. The Copping Machine design resume as follows: Production capacity of enumeration 220 kg / hour. The cutting mechanism uses 2 static blades and 6 rotary blades. Transmission system using Belt-Pulley mechanism. The 24 Hp Diesel engine is used.

Phenomenological Mechanism of Transformation Plasticity and the Constitutive Law Coupled with Thermo-Mechanical Plasticity

2008 ◽  
Vol 33-37 ◽  
pp. 1351-1358 ◽  
Author(s):  
Tatsuo Inoue
Keyword(s):  
Plastic Deformation ◽  
Phase Transformation ◽  
Simple Model ◽  
Constitutive Equation ◽  
Yield Function ◽  
Constitutive Law ◽  
Strain Rates ◽  
Strain Response ◽  
Transformation Plasticity ◽  
New Phase

Phenomenological mechanism of transformation plasticity is proposed in the first part of the paper by use of simple model why stress in mother phase increases to reach yielding due to progressing new phase and to induce plastic deformation even under small applied stress. Based on the discussion, a unified constitutive model including transformation-induced and ordinal thermomechanical plastic strain rates by introducing an effect of varying phases during phase transformation into yield function. Thus derived constitutive equation is applied to describe strain response under varying temperature and stress with some discussions as well as metallo-thermo-mechanical simulation of quenching.

Modeling and Experimental Verification of Plastic Behavior of the Martensitic Transformation Plastic Behavior in a Carbon Steel

2006 ◽  
Vol 118 ◽  
pp. 369-374 ◽  
Author(s):  
Dong Ying Ju ◽  
Wei Min Zhang ◽  
Y. Matsumoto ◽  
Ryuji Mukai
Keyword(s):  
Phase Transformation ◽  
Carbon Steel ◽  
Martensitic Transformation ◽  
Computational Simulation ◽  
Carbon Steels ◽  
Phase Transformation Temperature ◽  
Plastic Behavior ◽  
Measured Temperature ◽  
Transformation Plasticity ◽  
Quenching Process

The objective of this paper is to extend the capability of analyzing the time dependence and coupling of temperature, stress and strain effects on the macroscopic and microscopic structures subjected to quenching, and to introduce a theory of the kinetic of the phase transformation. Strain due to phase transformation, transformation plasticity and thermal expansion are the dominant factors that need to be included in the simulation of a quenching process. The evolution of the microstructure also influences the constitutive equations. In particular, as the temperature changes from the high to phase transformation, temperature and then room temperature, the stress-strain relationship changes from elastic-plastic strain. Therefore, in order to obtain a high strength and ductility in carbon steels, transformation plasticity often has a major effect in increasing of the residual stress during quenching process. In this paper, we measured temperature change and distortion occurring during the quenching process of a carbon steel(SCr420) by thermal simulation machine (Gleeble 1500) are used to determine the parameter of transformation plasticity due to the generation of martensite. The modeling of martensitic transformation plasticity is also verified by using of computational simulation of the quenching process.

Simulation of carburizing-quenching of a gear. Effect of carbon content on residual stresses and distortion

2004 ◽  
Vol 120 ◽  
pp. 489-497
Author(s):  
R. Mukai ◽  
D.-Y. Ju
Keyword(s):  
Residual Stress ◽  
Phase Transformation ◽  
Carbon Steel ◽  
Residual Stresses ◽  
Three Dimensional ◽  
Helical Gear ◽  
Coupled Analysis ◽  
Transformation Plasticity ◽  
Quenching Process ◽  
Thermal Physical Properties

Predictions of deformation, residual stresses and hardness after heat treatment of gears by numerical simulation are very useful to determine optimum condition to decrease the distortion of machinery parts. In this paper, simulation on carburizing quenching of a helical gear made of carbon steel SCr420 was carried out using three-dimensional coupled analysis based on thermo-mechanical theory considering phase transformation. The expansion and latent heat due to phase transformation at various carburizing conditions were measured by TMA and DSC to determine the thermal physical properties of SCr420 carbon steel. The influence of the transformation plasticity strain on deformation, residual stress and hardness of a gear was clarified in the simulation. The accuracy of simulation also is verified by the comparison between the experimental data and the simulated result of the distortion and residual stress. From the predicted results, improvement of the hardness and strength on surface of the gear due to the carburizing-quenching process can be verified.

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