scholarly journals Microstructure and Mechanical Properties of a Cold-Rolled Ultrafine-Grained Dual-Phase Steel

Materials ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 1399 ◽  
Author(s):  
Zhiyi Pan ◽  
Bo Gao ◽  
Qingquan Lai ◽  
Xuefei Chen ◽  
Yang Cao ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Dual Phase Steel ◽  
Uniform Elongation ◽  
Processing Route ◽  
Dual Phase ◽  
Dp Steel ◽  
Ultrafine Grained ◽  
Superior Mechanical Properties ◽  
Cold Rolled ◽  
New Processing

A new processing route to produce Ultrafine-Grained Dual-Phase steel has been proposed, involving cold-rolling and subsequent intercritical annealing of a fibrous ferrite–martensite starting structure. Ultrafine-grained DP (UFG-DP) steel with an average ferrite grain size of about ~2.7 μm and an average martensite island size of ~2.9 μm was achieved. Tensile testing revealed superior mechanical properties (the ultimate tensile strength of 1267 MPa and uniform elongation of 8.2%) for the new DP steel in comparison with the fibrous DP steels. The superior mechanical properties are attributed to the influence of microstructure refinement on the work-hardening and fracture behavior.

scholarly journals Microstructure and Mechanical Properties of Dual-Phase Steel/ Mikrostruktura I Własności Mechaniczne Stali Dwufazowej

2014 ◽  
Vol 59 (4) ◽  
pp. 1257-1261
Author(s):  
K. Miernik ◽  
S. Pytel
Keyword(s):  
Mechanical Properties ◽  
Dual Phase Steel ◽  
High Strength ◽  
Phase Region ◽  
Dual Phase ◽  
Two Phase ◽  
Dp Steel ◽  
Direct Quenching ◽  
Microstructure And Mechanical Properties ◽  
Tempering Treatment

Abstract The paper presents results of microstructure and mechanical properties of the dual phase (DP) steel plate with 12 mm thickness produced by intercritical annealing at a two-phase region of ferrite and austenite (α + γ) and direct quenching in water. In addition the tempering treatment at temperature of 650°C was applied to investigate effect of martensite softening on mechanical properties of the tested steel. The parameters of heat treatment were designed to achieve the high strength while retaining optimum impact strength of the DP steel.

scholarly journals FINE GRAINED DUAL PHASE STEEL BY THERMO MECHANICAL PROCESSING

2013 ◽  
pp. 237-240
Author(s):  
NEERAJAGARWAL NEERAJAGARWAL ◽  
G.P. CHAUDHARI ◽  
S.K. NATH
Keyword(s):  
Dual Phase Steel ◽  
Intercritical Annealing ◽  
Hsla Steel ◽  
Coarse Grained ◽  
Dual Phase ◽  
Mechanical Processing ◽  
Dp Steel ◽  
Fine Grained ◽  
Ultrafine Grained ◽  
Open Die Forging

The effect of thermo mechanical processing (TMP) on the mechanical properties of HSLA steel was investigated. TMP was conducted using a laboratory open die forging machine.Multiaxial forging (MAF) and intercritical annealing methods were used. TMP is designed to obtain ultrafine grained (UFG) steels. MAF is performed on prismatic shaped samples up to nine strain forging steps to produce ultra-fine grained (UFG) ferrite-pearlite steel with higher strength as compare to as received steel.Fine grained (FG) ferrite-martensite dual phases (DP) steel was fabricated by using combined effect of warm MAF and intercritical annealing. The tensile strength of FG-DP steels was much higher than that of the coarse-grained (CG) counterpart, and the uniform elongations were significantly enhanced. This steel exhibited the superior combination of higher strength and more rapid strain hardening compared to those of CG-DP steel was explained in terms of their specific microstructural features.

Effects of the Morphology and Distribution of Ferrite and Martensite on Mechanical Properties of Dual-Phases Steel

2013 ◽  
Vol 631-632 ◽  
pp. 404-411
Author(s):  
Jia Guo ◽  
Guo Sen Zhu ◽  
Zhi Qiang Yao ◽  
Jie Liu ◽  
Yu Du ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Impact Toughness ◽  
Yield Strength ◽  
Acicular Ferrite ◽  
Dual Phase Steel ◽  
Dual Phase ◽  
Dual Phase Steels ◽  
Dp Steel

The ingots were rolled by 550 mills in laboratory to obtain dual-phase steels. The influence of the morphology and distribution of ferrite and martensite on mechanical properties of dual-phase steel was investigated. The results indicated that some amount of acicular ferrite transformed in DP steel is available for decreasing the size and homogenizing the distribution of martensite in ferrite base. Meanwhile, the values of yield strength, tensile strength and impact toughness increases apparently, the value of elongation decreases to 22.5% .

Microstructure Evolution and Mechanical Properties of 780 MPa Hot Dip Galvanized Dual-Phase Steel

2010 ◽  
Vol 146-147 ◽  
pp. 1331-1335 ◽  
Author(s):  
Guo Bin Li ◽  
Zheng Zhi Zhao ◽  
Di Tang
Keyword(s):  
Mechanical Properties ◽  
Microstructure Evolution ◽  
Dual Phase Steel ◽  
Total Elongation ◽  
Annealing Process ◽  
Continuous Annealing ◽  
Dual Phase ◽  
Dp Steel ◽  
Gleeble 3500 ◽  
Soaking Temperature

The microstructure evolution of 780 MPa hot dip galvanized dual-phase (DP) steel at heating stages of the annealing process was analyzed using a Gleeble−3500 thermal/mechanical simulator. A multifunction continuous annealing simulator was employed to investigate the effect of annealing process on microstructure and mechanical properties of hot dip galvanized DP steel. The experimental results show that ferrite recovery and recrystallization, pearlite dissolution and austenite nucleation and growth take place in the annealing process of hot dip galvanized DP steel. The hardenability can be significantly improved by trace addition of vanadium. When the soaking temperature reaches 780 °C, the tensile strength and total elongation of DP steel can reach 785MPa and 15%, respectively. The microstructure of DP steel mainly consists of a mixture of ferrite and martensite.

Study of Recrystallization and Phase Transformation in a Cold-Rolled Dual-Phase Steel: Influence of Temperature and Heating Rate during First Annealing Stages

2011 ◽  
Vol 702-703 ◽  
pp. 818-821 ◽  
Author(s):  
Carla Barbatti ◽  
Patricia Romano Triguero ◽  
Stefan Van Bohemen ◽  
Steven Celotto ◽  
Dave N. Hanlon
Keyword(s):  
Heating Rate ◽  
Dual Phase Steel ◽  
Dual Phase ◽  
Low Carbon ◽  
Dp Steel ◽  
Influence Of Temperature ◽  
Individual Contributions ◽  
Cold Rolled ◽  
Dp Steels ◽  
The Individual

The effect of heating path and heating rate on the microstructure and texture development in cold-rolled continuously annealed DP steel was studied by SEM and EBSD. A methodology to separate the individual phases present in mixed microstructures, and thus to enable quantification of the individual contributions to the bulk texture has been applied. It was observed that a higher heating rate may promote strengthening of {111} textures in DP steels as observed in low carbon grades.

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