scholarly journals Comparative study of dissimilar tailor-welded blanks between DP590 and DP980 dual phase steels

2018 ◽  
Vol 192 ◽  
pp. 01041
Author(s):  
Rittichai Phaoniam ◽  
Jesada Kaewwichit ◽  
Komgrit Lawanwong
Keyword(s):  
Weld Zone ◽  
Rolling Direction ◽  
Ferrite Matrix ◽  
Butt Joint ◽  
Welding Parameters ◽  
Dual Phase ◽  
Dual Phase Steels ◽  
Dissimilar Weld ◽  
Tailor Welded Blanks ◽  
Gtaw Process

This research aims to study the dissimilar tailor-welded blanks between DP590 and DP980 dual phase steels using the autonomous GTAW process. The summarized results are as follows. It was found that utilized welding parameters in DP590 and DP980 steel butt joint were able to achieve complete penetration joint and there were not any defects. Furthermore, the dissimilar weld zone produced the hardness profilevalue between the DP590 and DP980 base metal. In particularly, DP590-HAZ region resulted in harden zone. Meanwhile, DP980-HAZ region induced a soften zone. By the way, the harden DP590-HAZ exhibited fine columnar martensite with a ferrite matrix. On the other hand, the soften DP980-HAZ represented a tempered martensite structures. Comparing the tensile test was carried out in order to investigate dissimilar welded joint strength in the different rolling directions. It was suggested that the specimen welded along to rolling direction was evidently larger tensile strength (1092 MPa) than the welding transverse to rolling direction (638 MPa). Moreover, the weakest fracture occurred apparently on the region of DP590-BM rather than the HAZ region.

scholarly journals Improvement on Mechanical Properties of Submerged Friction Stir Joining of Dissimilar Tailor Welded Aluminum Blanks

2021 ◽  
Vol 2021 ◽  
pp. 1-6
Author(s):  
R. Suryanarayanan ◽  
V. G. Sridhar ◽  
L. Natrayan ◽  
S. Kaliappan ◽  
Anjibabu Merneedi ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Friction Stir Welding ◽  
Mechanical Performance ◽  
Weld Zone ◽  
Tensile Tests ◽  
Welding Parameters ◽  
Negative Effects ◽  
Friction Stir ◽  
Tailor Welded Blanks ◽  
Secondary Precipitates

Friction stir welding is a solid-state welding method that produces joints with superior mechanical and metallurgical properties. However, the negative effects of the thermal cycle during welding dent the mechanical performance of the weld joint. Hence, in this research study, the joining of aluminum tailor welded blanks by friction stir welding is carried out in underwater conditions by varying the welding parameters. The tensile tests revealed that the underwater welded samples showed better results when compared to the air welded samples. Maximum tensile strength of 229.83 MPa was obtained at 1000 rpm, 36 mm/min. The improved tensile strength of the underwater welded samples was credited to the suppression of the precipitation of the secondary precipitates due to the cooling action provided by the water. The lowest hardness of 72 HV was obtained at the edge of the stir zone which indicated the weakest region in the weld zone.

Micromechanical Modeling of DP600 and DP800 Steels Plastic Behavior Based on the Mori-Tanaka Homogenization Method

2018 ◽  
Vol 930 ◽  
pp. 311-316
Author(s):  
Gustavo Coqui Barbosa ◽  
Luciano Pessanha Moreira ◽  
Lílian Barros da Silveira ◽  
Marcelo Costa Cardoso
Keyword(s):  
Ferrite Matrix ◽  
Homogenization Method ◽  
Micromechanical Modeling ◽  
Uniaxial Tensile ◽  
Plastic Behavior ◽  
Dual Phase ◽  
Dual Phase Steels ◽  
Microscopy Technique ◽  
Numerical Predictions ◽  
Homogenization Scheme

The properties of the dual-phase steels are attributed to the chemical composition, type, size, amount, and spatial distribution of different phases that can be obtained during thermomechanical treatments. In this way, modeling of the mechanical behavior of the dual-phase steel constituents, namely, ferrite and martensite, is crucial to the numerical simulation of sheet metal forming processes mainly to forecast the residual stresses per phase. In this work, the microstructure of as-received DP600 and DP800 cold rolled steel sheets with 1.2 mm nominal thickness were firstly characterized by means of scanning electron microscopy technique. The grain sizes and volume fractions of ferrite and martensite phases were obtained by means of digital image analysis. The Mori-Tanaka homogenization scheme was implemented in the finite element code ABAQUS assuming linear isotropic elasticity and isotropic work-hardening behavior for both ferrite (matrix) and martensite (inclusion) phases. The numerical predictions obtained with the Mori-Tanaka homogenization scheme for the macroscopic uniaxial tensile behavior are in good agreement with the experimental curves of both dual-phase steels.

scholarly journals Microstructural and Mechanical Characterization of Shielded Metal Arc Welded Dual Phase Steel Joints

2020 ◽  
Vol 44 (6) ◽  
pp. 381-386
Author(s):  
Walid Laroui ◽  
Redouane Chegroune ◽  
Şükrü Talaş ◽  
Mourad Keddam ◽  
Riad Badji
Keyword(s):  
Mechanical Properties ◽  
Dual Phase Steel ◽  
Volume Fraction ◽  
Plain Carbon Steel ◽  
Welding Parameters ◽  
Dual Phase ◽  
Shielded Metal Arc Welding ◽  
Dual Phase Steels ◽  
Quenching Temperature ◽  
Metal Arc Welding

Dual Phase steels are widely used in industry for various reasons for their improved mechanical properties owing to their ferrite and martensite contents in microstructure and good formability at industrial scale to achieve final shape with good ductility. In this study, shielded metal arc welding experiments were performed in order to evaluate the metallurgically and mechanically the properties of Dual Phase steels obtained from plain carbon steel AISI 1010 by water quenching at intercritical temperatures. Martensite volume fraction (MVF) was related to the intercritical quenching temperature which defines the mechanical properties of Dual Phase steel. All the welding parameters were kept constant in order to get a value of heat input equals 1.37 KJ/mm for all weldments. Martensite was found to be predominated in the fusion zone and its hardness was the highest compared to base metal (BM) and heat affected zone (HAZ). The extent of ductile zone was found to be dependent on the MVF and reached over 1.2 mm wide. Tensile properties of weldments were deteriorated by 35% in ultimate tensile strength (UTS) and by 15% in elongation. The failure of all the welded joints was occurred in the SC zone, with the fractured surfaces of a dimple feature.

Microstructural Characterization of Dual and Multiphase Steels Applied to Automotive Industry

2014 ◽  
Vol 775-776 ◽  
pp. 146-150 ◽  
Author(s):  
Cristina Sayuri Fukugauchi ◽  
Antonio dos Reis Faria Neto ◽  
Rosinei Batista Ribeiro ◽  
Marcelo dos Santos Pereira
Keyword(s):  
Mechanical Properties ◽  
Microstructural Characterization ◽  
Tensile Tests ◽  
Ferrite Matrix ◽  
Microstructure Characterization ◽  
Second Phase ◽  
Dual Phase ◽  
Dual Phase Steels ◽  
Trip Steels

TRIP (Transformation Induced Plasticity) and DP (Dual-Phase) steels are written in a new series of steels which present excellent mechanical properties. As for microstructure aspect, TRIP steels consist on a ferrite matrix with a second phase dispersion of other constituents, such as bainite, martensite and retained austenite, while dual-phase steels consist on martensite dispersion in a ferrite matrix. In order to identify the different microconstituents present in these materials, microstructure characterization techniques by optical microscopy (using different etchants: LePera, Heat-Tinting and Nital) and scanning electron microscopy were carried out. This being so, microstructures were correlated with mechanical properties of materials, determined by means of tensile tests. It is concluded that steels assisted by TRIP effect have a strength and elongation relation higher than the dual-phase one. With microstructure characterization, it was observed phases present in these materials microstructure.

Analytical prediction of springback in bending of tailor-welded blanks incorporating effect of anisotropy and weld zone properties

2016 ◽  
Vol 232 (4) ◽  
pp. 294-306 ◽  
Author(s):  
Vijay Gautam ◽  
Vinayak Manohar Raut ◽  
D Ravi Kumar
Keyword(s):  
Strain Hardening ◽  
Analytical Model ◽  
Yield Criterion ◽  
Weld Zone ◽  
Rolling Direction ◽  
Weld Line ◽  
Analytical Prediction ◽  
Tailor Welded Blanks ◽  
Weld Properties ◽  
Different Thickness

An analytical model for the prediction of springback in bending of longitudinally welded tailor-welded blanks of different thickness is presented in this paper. The effect of strain hardening, anisotropy and weld zone has been incorporated in the analytical model. Power law of strain hardening and Hill’s anisotropic yield criterion have been used in the development of the analytical model for prediction of springback in tailor-welded blanks. The predicted values of springback are validated with experiments on V-bending of laser-welded blanks of Extra Deep Drawing quality steel sheets. Longitudinally welded specimens of three different thickness combinations with weld line oriented at 0°, 45° and 90° to the rolling direction are tested to investigate the effect of anisotropy. The springback values predicted by the analytical model incorporating the weld properties are found to be in good agreement with the experimental results in all of the cases. The springback has been found to be maximum when the weld line is oriented at 45° to the rolling direction.

The Numerical Simulation on Welding Stress Field of High Strength Steel for Axle Case Steel 390Q

2011 ◽  
Vol 239-242 ◽  
pp. 2370-2375
Author(s):  
Yan Yu ◽  
Feng Xue Wang ◽  
Jun Chen ◽  
Zhen Liu
Keyword(s):  
Stress Field ◽  
Welding Speed ◽  
Weld Zone ◽  
Three Dimensional ◽  
High Strength ◽  
Simulation Method ◽  
Butt Joint ◽  
Welding Parameters ◽  
Welding Stress ◽  
Stress Simulation

This paper takes the butt joint of axle case steel as research object, simulates the real-time three dimensional dynamics CO2 shielded welding of welding stress field by FEM software ANSYS and obtains the axle case steel 390Q’s transient stress field of weld zone at different welding speed. On that basis, the feasible dynamic simulation method of three-dimensional stress welding field which provides theoretical basis and guidelines for optimizing welding technology and norm welding parameters was proposed. The result of welding stress simulation shows that the welding stress is the lowest when the optimum welding speed is 5mm/s.

Microstructure Evolution and Numerical Simulation of DP Steel TWBs During Warm Tensile Deformation

2011 ◽  
Vol 418-420 ◽  
pp. 1222-1227
Author(s):  
Lu You Yue ◽  
Zhong Fu Huang ◽  
Zhen Liang He ◽  
Man Guo Jiang ◽  
Wei Chen
Keyword(s):  
Microstructure Evolution ◽  
Dual Phase Steel ◽  
Volume Fraction ◽  
Tensile Deformation ◽  
Weld Zone ◽  
Tensile Tests ◽  
Secondary Development ◽  
Tensile Fracture ◽  
Dual Phase ◽  
Tailor Welded Blanks

The tensile tests of DP590 dual-phase steel tailor-welded blanks were carried out at different temperatures and strain rates. Quantitative analysis of metallographic was utilized to study the microstructure evolution of the base metal area and the weld zone of the tensile fracture. By combining the microstructure evolution model with the secondary development technologies of ABAQUS, the microstructure evolution of dual-phase steel tailor-welded blanks was simulated during warm tensile tests. The results show that, with the temperature increasing and strain rate decreasing, the dynamic recrystallization volume fraction of ferrite increases, and the martensite transform into equiaxed ferrite gradually. The results of microstructure simulation are in good agreement with experimental results.

scholarly journals Effect of Current on Mechanical Properties and Microstructure of Aluminum 6061 with Gas Tungsten Arc Welding Process

Kapal ◽  
2020 ◽  
Vol 17 (3) ◽  
pp. 107-113
Author(s):  
Tarmizi Tarmizi ◽  
Kevin Daniel Sianturi ◽  
Irfan Irfan
Keyword(s):  
Mechanical Properties ◽  
Arc Welding ◽  
Gas Flow ◽  
Welding Process ◽  
Butt Joint ◽  
Gas Tungsten Arc Welding ◽  
Welding Parameters ◽  
Gas Tungsten Arc ◽  
Gtaw Process ◽  
Gas Tungsten

Aluminum 6061 is an aluminum alloy that is widely used in various industrial fields, which heat treatable. However, it can be joined using a welding process. Aluminum joining using the Gas Tungsten Arc Welding (GTAW) process has become the option to produce good quality joints. This research aims to get optimum welding parameters by knowing the mechanical properties and microstructure of the welding results. The GTAW process uses a 25-volt voltage, Argon protective gas flow rate of 15 liters per minute with filler rod ER 5356 with 2.4 mm diameter and electrodes tungsten 2.4 mm in diameter. This process uses a single V butt joint and groove angle of 60° with variations in the current of 100, 110 and 120 A. The results indicate that specimens with a variety of current of 110 A give better results in the absence of defects, have a tensile strength of 152 MPa, and get a hardness value of 87.55 HV, which is the highest compared to the other two specimens. Whereas specimens with the current variation of 100 and 120 A have defects in the weld area. The optimum parameters of the 6061 aluminum GTAW process with a thickness of 6 mm using a current of 110 A bring on better outcomes and mechanical properties than the use of currents of 100 and 120 A.

Evolution of Microstructural and Mechanical Properties of Fiber Laser Welded Dual Phase Steels

2019 ◽  
Vol 391 ◽  
pp. 128-135 ◽  
Author(s):  
P.V.S. Lakshminarayana ◽  
J. Prakash Gautam ◽  
P. Mastanaiah ◽  
G. Madhusudan Reddy ◽  
K. Bhanu Sankara Rao
Keyword(s):  
Mechanical Properties ◽  
Laser Welding ◽  
Tensile Test ◽  
Fiber Laser ◽  
Heat Input ◽  
Weld Zone ◽  
Base Material ◽  
Dual Phase ◽  
Dual Phase Steels ◽  
Weld Joints

Over the past decade, Dual Phase steels are extensively used in the automotive industry to reduce the weight of the vehicles. The Fiber laser welding has been showing superior weld quality over other laser welding methods. DP 600 grade is most widely used grade among DP steels. Influence of heat input on microstructural and mechanical properties for the given thickness has been investigated. Widths of weld zone and Heat Affected Zone have decreased with decreasing the heat input. Rapid cooling rates in the fusion zone have resulted in martensitic structure and hardness also increased in proportional. Tensile test and notch tensile test of the welded joints have been confirmed that weld joints are stronger than that the base material. From the ensile test along the weld joint of all heat inputs, it has been observed that lower heat input weld joints have shown better properties over the others.

scholarly journals Production and characterization of dual-phase steels from an AISI 8620 steel with high Mn content

DYNA ◽  
2021 ◽  
Vol 88 (217) ◽  
pp. 42-49
Author(s):  
Dayi Gilberto Agredo Diaz ◽  
Irma Angarita Moncaleano ◽  
Rodolfo Rodríguez Baracaldo
Keyword(s):  
Charpy Impact ◽  
Microstructural Characterization ◽  
Ferrite Matrix ◽  
Martensite Phase ◽  
Mechanical Resistance ◽  
Dual Phase ◽  
Dual Phase Steels ◽  
Mn Content ◽  
Microscopy Techniques ◽  
The Impact

Dual phase steels are materials whose microstructure is composed of a ferrite matrix with martensite islands. Ferrite provides excellent ductility, while martensite increases the strength of steel, this provides a special appeal in the automotive industry. The main objective of this research is to obtain dual phase steels from AISI 8620 steel with a high Mn content, performing heat treatments in the intercritical range to obtain martensite percentages of 27, 33, 41, and 48%, respectively. Microstructural characterization is performed using optical microscopy and scanning electron microscopy techniques, the mechanical characterization is carried out using hardness, tension and charpy impact tests. The highest mechanical resistance is achieved in steel with 41% martensite phase, while the highest ductility is given for the material with 27% martensite, a fractographic analysis of all materials allowed to determine that the type of fracture presented is ductile. When the martensite fraction increases, the impact energy exhibits a decreasing behavior, while the hardness behaves in an increasing way.

Sign in / Sign up

Export Citation Format

Share Document