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Strain Hardening and Strain Rate Sensitivity Behaviors of advanced high strength steels

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Journal of Iron and steel Research International 2013年第6期20卷 68-74页

作者： F Ozturk A Polat S Toros R C Picu Department of Mechanical Engineering Nigde University Department of Mechanical Aerospace and Nuclear Engineering Rensselaer Polytechnic InstituteTroy 12180 New York USA

The mechanical properties of commercial dual phase （DP）, transformation induced plasticity （TRIP）, and high strength low alloy （HSLA-340） steel sheets are investigated and compared at various strain rates ranging from 0.001 7to 0.17 s-1 at ambient *** steel outperforms the other two materials , having comparable ductility and twice as large strength relative to DP *** has larger strength and much larger ductility than *** exceuent ductility of TRIP800is due to its high strain hardening capability , which promotes stable plastic *** is observed that the strain hardening rate in TRIP800does not decrease to zero at failure , as common in most materials in which failure is preceded by necking.

关键词： steel advanced high strength steel HSLA DP TRIP hardening

Shear Fracture of advanced high strength steels

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Journal of Iron and steel Research International 2014年第10期21卷 938-944页

作者： Sheng HUANG Yi-xi ZHAO Chun-feng HE State Key Laboratory of Mechanical System and Vibration Shanghai Jiao Tong University Shanghai Key Laboratory of Digital Manufacture for Thin-walled Structures Shanghai Jiao Tong University

Failure experiments were carried out through a stretch-bending test system for advanced high strength steels, i.e. dual-phase （DP） steels and martensitic steels （MS）. The die radius in this system was designed from 1 to 15 mm to investigate the failure mode under different geometries. Two failure modes were observed during the ex- periments. As a result, critical relative radii （the ratio of inner bending radius R to sheet thickness t） for DP590 and DP780 steels were obtained. The stretch-bending tests of DP980 display some trends unlike DP590 and DP780 steels, and curve of DP980 in different thicknesses does not coincide well. high blank holder force exhibits more possibility of shear fracture tendency than low blank holder force. The unique character of high strength martensitic steel （1500MS） is that no shear fracture is found especially over small bending radius （R =2 mm） under the same experi- mental conditions. Microstructure analysis indicates that there are obviously elongated grains on shear fracture sur- face. It shows smaller diameter and shallower depth of the dimples than the necking failure.

关键词： advanced high strength steel shear fracture critical R/t blank holder force microstructure

Carbide precipitation behavior and mechanical properties of micro-alloyed medium Mn steel

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Journal of Materials Science & Technology 2020年第12期47卷 122-130页

作者： Luhan Hao Xiangji Guangqian Zhang Wei Zhao Mingyue Sun Yan Peng National Engineering Research Center for Equipment and Technology of Cold Strip Rolling Yanshan UniversityQinhuangdao 066004China Shenyang National Laboratory for Material Science Institute of Metal ResearchChinese Academy of Sciences72 Wenhua RoadShenyang 110016China

The carbide precipitation behavior and mechanical properties of advanced high strength steel deformed at different temperatures are investigated by X-ray diffractometer(XRD),scanning electron microscope(SEM),transmission electron microscope(TEM) equipped with an energy dispersing spectroscopy(EDS),and tensile *** medium Mn steel was subjected to controlled deformation up to 70% at 750℃,850℃,950℃,and 1050℃,and then quenched with water to room temperature,followed by intercritical annealing at 630℃ for 10 *** comparison with the undeformed and quenched specimen,it can be concluded that acicular cementite precipitates during the quenching and cooling process,while granular NbC is the deformation induced precipitate and grows during the following annealing *** the deformation temperature increases from 750℃ to 1050℃,the product of strength and elongation increases at first and then *** smallest average size of second phase particles(20 nm) and the best mechanical properties(32.5 GPa%) can be obtained at the deformation temperature of 950℃.

关键词： advanced high strength steel Medium Mn steel Thermal deformation Intercritical annealing The product of strength and elongation

Comparing Properties of Adhesive Bonding,Resistance Spot Welding,and Adhesive Weld Bonding of Coated and Uncoated DP 600 steel

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Journal of Iron and steel Research International 2011年第9期18卷 70-78页

作者： Fatih Hayat Metallurgy and Materials Engineering Department Engineering FacultyKarabuk University Baliklarkayasi

Zinc coated dual phase 600 steel （DP 600 grade） was investigated, utilisation of which has gradually increased with each passing day in the automotive industry. The adhesive bonding （AB）, resistance spot welding （RSW）, and adhesive weld bonding （AWB） ioints of the zinc coated DP 600 steel were investigated. Additionally, the zinc coating was removed using HCL acid in order to investigate the effect of the coating. The microstructure, tensile shear strengths, and fracture properties of adhesive bonding （AB）, resistance spot welding （RSW）, and adhesive weld bonding （AWB） joints of the coated and uncoated DP 600 steel were compared. In addition, a mechani cal-electrical-thermal coupled model in a finite element analysis environment was utilised. The thermal profile phe nomenon was calculated by simulating this process. The results of the tensile shear test indicated that the tensile load bearing capacity （TLBC） values of the coated specimens among the three welding methods were higher than those of the uncoated specimens. Additionally, the tensile strength of the AWB joints of the coated and uncoated specimens was higher than that of the AB and RSW joints. It was determined that the fracture behaviours and the deformation caused were different for the three welding methods.

关键词： advanced high strength steel DP600 adhesive weld bonding microstructure deformation fracture

Hot Stamping Parameters Optimization of Boron steel Using a Response Surface Methodology Based on Central Composite Design

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Journal of Iron and steel Research International 2015年第6期22卷 519-526页

作者： Ming-dong HUANG Bao-yu WANG Jing ZHOU School of Mechanical Engineering University of Science and Technology Beijing

The effect of hot stamping parameters on the mechanical properties of 22MnB5 steel sheet with thickness of 1.1 mm is studied. The considered parameters are austenization temperature （800- 1 000 ℃ ）, austenitizing soa king time （60-540 s）, initial deformation temperature （560-800 C） and tool temperature （20-220 ℃）. In order to obtain hot stamped parts with optimal mechanical properties, response surface methodology based on the central composite design has been employed to design the experiment matrix. Tensile strength of hot stamped parts is deter- mined as the relation in the mathematical model. The optimal condition and objective effects of parameters are deter mined via this relation. The statistical analysis showed that all four factors significantly affect the tensile strength of the hot stamped parts. The optimum austenization temperature is found to be 918.89 ℃ with the austenitizing soa- king time, initial deformation temperature and tool temperature of 279.45 s, 684.69 C and 21.85 ℃, respectively. These optimal hot stamping parameters prove to have high tensile strength （1 631.84 MPa） where deviation between predicted and actual response falls within 2 %.

关键词： hot stamping advanced high strength steel response surface method optimization

Feasibility of 0.02% Nb-Based Microalloyed steel for the Application of One-Step Quenching and Partitioning Heat Treatment

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Materials Sciences and Applications 2021年第8期12卷 374-387页

作者： Basem Tarek Eman EL-Shenawy Ahmed El-Sabbagh Mohamed A. Taha Design and Production Engineering Department Faculty of Engineering Ain Shams University Cairo Egypt Plastic Deformation Department Central Metallurgical R&D Institute (CMRDI) Cairo Egypt

To attain an enhanced combination of mechanical properties for low alloyed steel, the current study has been made to fulfill that growing need in the industry. Its results are introduced within this paper. One step Quenching and Partitioning (Q&P) heat treatment has been applied on Niobium-based microalloyed steel alloy with 0.2 %C, in the form of 2 mm thickness sheets. The target of this study is to investigate the viability of applying that significantly recommended, results-wise, heat treatment on the highly well-suited alloy steel samples, to achieve the main target of enhanced properties. A single temperature of 275°C was used as quenching and Partitioning temperature. Four Partitioning periods (30, 200, 500, and 1000 Seconds) were used for soaking at the same temperature. The results were analyzed in the light of microstructural investigation and mechanical testing. All applied cycles did not enhance the strength but moderately improved the ductility and toughness, mainly caused by the slightly high soaking temperature used. Niobium impact of grain refining was apparent through all cycles. The cycle of 500 Seconds Partitioning time obtained optimum values at that particular temperature. The 1000 Seconds Cycle obtained the worst combination of properties. A set of recommendations are set. More research is required at this point, where a lower Partitioning temperature is advised. In the light of the applied combination of parameters, the Partitioning period at such temperature is advised to be between 500 and 1000 Seconds. A high probability that periods closer to 500 than 1000 Seconds will produce better results. More research is needed between those two values of Partitioning time to precisely determine the optimum time at that temperature on that specific alloy.

关键词： Nb-Based Microalloyed steel advanced high strength steel Quenching and Partitioning Retained Austenite Martensite Transformation Automotive Applications

CEM? Process: the Most Efficient Process for Thin Gauge Products

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CEM? Process: the Most Efficient Process for Thin Gauge Prod...

Fatigue Crack Growth Behavior of advanced Some high strength steels

第十一届中国钢铁年会

作者： KO Young-ju CHO Myung-jong CHUNG Jae-sook HWANG Jong-yeon Global POIST Project Department CEM Project POSCO

POSCO has developed CEM(Compact Endless casting and rolling Mill) process, which is based on high casting speed with 6 m/min and endless rolling from mold meniscus to down coiler. Mechanical design improvement and high speed technology development have been achieved through various efforts such as the molten flow control in the mold, water cooling in the caster and the mold level hunting control. For stable change of coil thickness and width during endless rolling, the control software of casting and rolling have been reinforced continuously against a lot of abnormal situation. Owing to the stable endless rolling technology, the production ratio of thin gauge HR coils was increased significantly to 70% but, on the contrary, the cobble ratio in the rolling region was greatly decreased. Because the temperature and the speed of the strip are constant during endless rolling in finishing mill region, and it makes easy to control the strip temperature to produce AHSS in the run out table.

关键词： CEM? high speed casting endless rolling thin gauge advanced high strength steel

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Fatigue Crack Growth Behavior of Advanced Some High Strength...