Numberical Simulation of Welding Deformation under Different Conditions

2012 ◽  
Vol 538-541 ◽  
pp. 1439-1442
Author(s):  
Qing Yang ◽  
Shu Jun Xie ◽  
Hai Tao Gao
Keyword(s):  
Heat Treatment ◽  
Room Temperature ◽  
Treatment Process ◽  
Three Dimensional ◽  
Angular Distortion ◽  
Solid Model ◽  
Heat Treatment Process ◽  
Cooling Process ◽  
Finite Element Software ◽  
Set Up

To simulate the welding and heat treatment process of the Q345 plate with V-groove, Finite element software ANSYS was employed. A reasonable three-dimensional solid model was set up by using element birth and death technology to simulate the formation of the weld. Constraint was applied on both sides of the base metal in the welding and cooling process. Then constraint was removed when the specimen was cooled to room temperature, the angular distortion of welding increases by 75.03% after the constraint is removed. Then heat treatment was conducted on the plate of which the constraint was removed. The deformation results show that after heat treatment the angular distortion is reduced to 30.37% of the value before heat treatment.

Numerical Simulation of the H-Beam during Cooling Process

2013 ◽  
Vol 310 ◽  
pp. 145-149 ◽  
Author(s):  
Jian Liu ◽  
Fu Zeng Hou ◽  
Xiao Guang Yu
Keyword(s):  
Mechanical Properties ◽  
Numerical Simulation ◽  
Heat Treatment ◽  
Theoretical Basis ◽  
Treatment Process ◽  
Residual Austenite ◽  
Heat Treatment Process ◽  
Cooling Process ◽  
Controlled Cooling ◽  
H Beam

In order to improve the comprehensive mechanical properties of the steel, the heat treatment software COSMAP is used to simulate the rolling and controlled cooling of H-beam. The numerical simulation shows that the mechanical properties of controlled cooling can be obviously improved, when the cooling rate is controlled at 10°C/s around. Strength and hardness can be improved under the condition of ductility and toughness ensured. Meanwhile the amount of residual austenite can be reduced significantly. It provides a theoretical basis for further optimization of the heat treatment process.

scholarly journals Effect of Heat Treatments on Microstructural Evolution and Tensile Properties of 15Cr12MoVWN Ferritic/Martensitic Steel

Metals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1271
Author(s):  
Tingwei Ma ◽  
Xianchao Hao ◽  
Ping Wang
Keyword(s):  
Heat Treatment ◽  
Tensile Properties ◽  
Room Temperature ◽  
Treatment Process ◽  
Martensitic Steel ◽  
Heat Treatment Process ◽  
Lath Width ◽  
Optimum Heat ◽  
Martensitic Lath ◽  
Optimum Heat Treatment

In this study, the phase transformation temperature of 15Cr12MoVWN ferritic/martensitic steel was determined by differential scanning calorimetry to provide a theoretical basis for the design of a heat treatment process. An orthogonal design experiment was performed to investigate the relationship between microstructure and heat treatment parameters, i.e., normalizing temperature, cooling method and tempering temperature by evaluating the room-temperature and elevated-temperature tensile properties, and the optimum heat treatment parameters were determined. It is shown that the optimized heat treatment process was composed of normalizing at 1050 °C followed by air cooling to room temperature and tempering at 700 °C. Under the optimum heat treatment condition, the room-temperature tensile properties were 1014 MPa (UTS), 810.5 MPa (YS) and 18.8% (elongation), while the values are 577.5 MPa (UTS), 469 MPa (YS) and 39.8% (elongation) tested at 550 °C. The microstructural examination shows that the strengthening contributions from microstructural factors were the martensitic lath width, dislocations, M23C6, MX and grain boundaries of prior austenite grain (PAG) in a descending order. The main factors influencing the tensile strength of 15Cr12MoVWN steel were the martensitic lath width and dislocations.

Numerical Simulation of the I-Beam during Cooling Process

2013 ◽  
Vol 712-715 ◽  
pp. 1634-1637
Author(s):  
Jian Liu ◽  
Fu Zeng Hou ◽  
Xiao Guang Yu
Keyword(s):  
Mechanical Properties ◽  
Numerical Simulation ◽  
Heat Treatment ◽  
Cooling Rate ◽  
Theoretical Basis ◽  
Treatment Process ◽  
Residual Austenite ◽  
Heat Treatment Process ◽  
Cooling Process ◽  
Controlled Cooling

In order to improve the comprehensive mechanical properties of the steel, the heat treatment software COSMAP is used to simulate the rolling and controlled cooling of I-beam. The numerical simulation shows that: when the cooling rate is controlled at 10 °C/s around, the mechanical properties of controlled cooling can be obviously improved. The strength and hardness can be improved on the condition of ductility and toughness ensured, while the amount of residual austenite can be reduced significantly, which provide a theoretical basis for further optimization of the heat treatment process.

Thermal Treatment of Aviation Aluminum Alloys in Strip Processing Lines

2017 ◽  
Vol 746 ◽  
pp. 168-175 ◽  
Author(s):  
Caesar Sasse ◽  
Fritz Brühl ◽  
Michael Schäfer
Keyword(s):  
Heat Treatment ◽  
Cold Rolling ◽  
Automotive Industry ◽  
Treatment Process ◽  
Light Weight ◽  
Heat Treatment Process ◽  
Annealing Furnace ◽  
Cooling Process ◽  
Cooling Rates ◽  
High Cooling Rates

For many years now the use of aluminum as a light weight construction material in the aviation and automotive industry is on the rise. Without the innovative aluminum materials the strategies of constructing in light-weight design cannot be implemented. Last but not least this trend is driven by official requirements directing the reduction of greenhouse gas emissions. Aluminum is used both for structural components as well as for external body parts. Aluminum products for these industries have to undergo a production process which includes homogenizing of the ingots, hot rolling and cold rolling. Subsequent to the cold rolling process, the aluminum sheets have to undergo a heat treatment process to regain formability as well as the required material strength. The material properties required by the aviation and automotive industry are achieved in the annealing furnace and downstream cooling equipment. Equal and well-aimed heating and cooling along the length and across the width provide the strips with the metallurgical properties with regard to hardness and grain size. Hence the annealing furnace and the downstream cooling equipment are the decisive process components and critical for the high quality of the end material. First the material is heated up to a temperature above 500 °C for the solution heat treatment process. The following process step foresees cooling down the material to ambient temperature. Especially 6xxx automotive-alloys as well as 2xxx and 7xxx aerospace-alloys require high cooling rates. Eventually, the material gets heated up again for a certain time to apply an artificial aging process. In floatation heat treatment furnaces the strip is guided sinusoidal and contactless by floatation nozzles through the furnace. The strip is heated up and kept at the required strip temperatures in time, so the aluminum-alloy obtains their structure. The cooling process with high cooling rates is executed as a combination of water and air cooling. A mathematical model calculates the necessary settings for the annealing and cooling process under consideration of the mechanical properties. Paper and presentation will introduce the furnace technology for aluminum strips. Especially, the heat treatment facilities for heat and chemical treatment lines will be presented. It will especially emphasize on heat treatment cycles, the materials and the applications.

scholarly journals Room temperature ionic liquids in a heat treatment process for metals

RSC Advances ◽  
2014 ◽  
Vol 4 (98) ◽  
pp. 55077-55081 ◽  
Author(s):  
C. Schmidt ◽  
M. Beck ◽  
M. Ahrenberg ◽  
C. Schick ◽  
O. Keßler ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Ionic Liquids ◽  
Room Temperature ◽  
Treatment Process ◽  
Room Temperature Ionic Liquids ◽  
Heat Treatment Process

scholarly journals The Effects of Al3(Sc, Zr) Precipitation Phase on Selective Laser Melting Al-Mg-Sc-Zr alloy: Microstructure, Mechanical properties and Fatigue resistance

2021 ◽  
Author(s):  
Liang-Yan Lee ◽  
Kai-Chieh Chang ◽  
Jun-Ren Zhao ◽  
Fei-Yi Hung
Keyword(s):  
Heat Treatment ◽  
Room Temperature ◽  
Treatment Process ◽  
Single Stage ◽  
Heat Treatment Process ◽  
Two Stage ◽  
The Matrix ◽  
Melting Pool ◽  
Stage Heat Treatment ◽  
Zr Alloy

Abstract In this study, an Al-Mg-Sc-Zr alloy fabricated through selective laser melting (SLM) was subjected to a single-stage heat-treatment process and a two-stage heat-treatment process to determine the effect of heat treatment on the tensile properties and fatigue properties of the alloy at room temperature and high temperatures. The results indicated that heat treatment caused the precipitation of Al3(Sc, Zr), thus increasing the tensile strength. The dynamic strain aging of the SLM Al-Mg-Sc-Zr alloy disappeared as the tensile temperature increased. The alloy exhibited the highest tensile strength after it was subjected to the single-stage heat treatment at both room temperature and high temperatures owing to the precipitated phase distribution at the melting pool boundaries. However, fatigue resistance and high-temperature necking of the as-printed SLM Al-Mg-Sc-Zr alloy were problems that could not be resolved with the single-stage heat treatment. In the two-stage heat treatment, the precipitated phases exhibited a uniform distribution in the matrix, thereby reducing the high-temperature necking phenomenon. The two-stage heat treatment helped reduce the melting pool interface effect and strengthen the matrix, restricting the propagation of fatigue cracks and increasing the fatigue life of materials.

Research of Control Cooling Heat Treatment Process in the Ductile Iron Gear

2014 ◽  
Vol 1014 ◽  
pp. 134-137
Author(s):  
Zhi Gang Wang ◽  
Dong Xiang ◽  
Ke Gao Liu ◽  
Min Jing
Keyword(s):  
Heat Treatment ◽  
Ductile Iron ◽  
Treatment Process ◽  
High Hardness ◽  
Lower Bainite ◽  
Hot Water ◽  
Cooling Time ◽  
Heat Treatment Process ◽  
Cooling Process ◽  
The Core

By controlling the cooling, mean temperature adjustment and isothermal cooling process, bainite and martensite can be produced in the surface and the core of the ductile iron gear using the 75°C hot water as the quenching medium. Since it has a high hardness value in the point and the pitch circle, a low hardness value in the root and the core, this ductile iron can be applied to the actual production of the gear. The gear surface organization will be affected by quenching cooling time. The appearance of the temper phenomenon can result in the decrease of hardness value in the surface of the gear when the cooling time is short..However, the content of the lower bainite can be increased by extending the cooling time properly in the surface of the gear. The influence of the quenching cooling time on the core organization of the gear is small.

scholarly journals Characterization of Microstructure, Precipitations and Microsegregation in Laser Additive Manufactured Nickel-Based Single-Crystal Superalloy

Materials ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2300 ◽  
Author(s):  
Zhaoyang Liu ◽  
Jiayang Shu
Keyword(s):  
Heat Treatment ◽  
Single Crystal ◽  
Treatment Process ◽  
Three Dimensional ◽  
Subsequent Heat Treatment ◽  
Single Crystal Superalloy ◽  
Wall Structure ◽  
Thin Wall ◽  
Heat Treatment Process ◽  
Dimensional Network

In this study, the microstructure, precipitations, and microsegregation in the laser additive manufactured thin-wall structure of a single-crystal superalloy are synthetically characterized. The influence of a subsequent heat treatment on the microstructure and precipitations is discussed. The results show that under the given processing conditions, the single-crystal microstructure is regenerated perfectly with small misorientation angles in the thin-wall structure. The crystal morphology shows obvious diversity and instability with the incremental height of thin-wall structure. With the increase of manufacturing height, both the primary and secondary dendritic arm spacings of epitaxial columnar dendrites first increase rapidly and then reach a dynamic balanced state. The distribution of precipitations and pores keeps symbiosis in the interdendritic region and shows periodic band characteristic with high density in the band region and low density in the inner region of plate layers. The microsegregation of element atoms in the microstructure shows a three-dimensional network distribution. The concentration of element atoms keeps good consistency with high value in the three-dimensional network and nearly standard value in the outside region. The subsequent heat treatment process contributes to the occupation of as-processed pores by the expanded mature precipitations with good blocky shape. Further optimization of the heat treatment process for improving the lattice coherency of precipitated γ’ phase and γ matrix in the laser additive manufactured single-crystal superalloy is needed and valuable.

Optimization of Heat Treatment Process of ZE41A Magnesium Alloy Using Grey- Based Taguchi Method

2008 ◽  
Vol 3 (2) ◽  
pp. 63-69
Author(s):  
M. Sivapragash ◽  
◽  
V. Sateeshkumar ◽  
P.R. Lakshminarayanan ◽  
R. Karthikeyan ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Magnesium Alloy ◽  
Taguchi Method ◽  
Treatment Process ◽  
Heat Treatment Process

EFFECT ON HARDNESS and MICRO STRUCTURAL BEHAVIOUR OF TOOL STEEL AFTER HEAT TREATMENT PROCESS

2017 ◽  
Vol 4 (24) ◽  
Author(s):  
Karanbir Singh ◽  
Aditya Chhabra ◽  
Vaibhav Kapoor ◽  
Vaibhav Kapoor
Keyword(s):  
Heat Treatment ◽  
Empirical Study ◽  
Tool Steel ◽  
Treatment Process ◽  
Heat Treatment Process ◽  
Structural Behaviour ◽  
Treatment Processes ◽  
En 31

This study is conducted to analyze the effect on the Hardness and Micro Structural Behaviour of three Sample Grades of Tool Steel i.e. EN-31, EN-8, and D3 after Heat Treatment Processes Such As Annealing, Normalizing, and Hardening and Tempering. The purpose of Selecting Tool Steel is Because Tool Steel is Mostly Used in the Manufacturing Industry.This study is based upon the empirical study which means it is derived from experiment and observation rather than theory.

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