Effect of martensite strength on the tensile strength of dual phase steels

1989 ◽  
Vol 24 (6) ◽  
pp. 1991-1994 ◽  
Author(s):  
Huang-Chuan Chen ◽  
Gwo-Hwa Cheng
Keyword(s):  
Tensile Strength ◽  
Dual Phase ◽  
Dual Phase Steels

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% .

Development of Cold-Rolled Dual-Phase Steels with Tensile Strength Above 1000 MPa and Good Bendability

2015 ◽  
Vol 46 (10) ◽  
pp. 4755-4771 ◽  
Author(s):  
Gejza Rosenberg ◽  
Iveta Sinaiová ◽  
Pavol Hvizdoš ◽  
L’uboš Juhar
Keyword(s):  
Tensile Strength ◽  
Dual Phase ◽  
Dual Phase Steels ◽  
Cold Rolled

scholarly journals Fibre laser welding of dual phase steels

2015 ◽  
Vol 21 (4) ◽  
pp. 311 ◽  
Author(s):  
Pavol Švec ◽  
Alexander Schrek ◽  
Viliam Hrnčiar ◽  
Tomáš Csicsó
Keyword(s):  
Tensile Strength ◽  
Solid State ◽  
Laser Welding ◽  
Fusion Zone ◽  
Heat Affected Zone ◽  
Wave Length ◽  
Fibre Laser ◽  
Maximum Output ◽  
Dual Phase ◽  
Dual Phase Steels

<p class="AMSmaintext"><span lang="EN-GB">The fibre laser welding of two different dual phase steels HCT980X and HCT600X was evaluated. The sheets with thickness of 1.2 mm were welded using the solid-state fibre laser IPG type YLR 4500 with maximum output 4.5 kW and wave length 1060 nm at graduated beam powers and welding speeds. The microstructure of welded samples was analysed, microhardness and tensile strength were measured. The heat input influenced the microstructure of the fusion zone and heat affected zone. The microhardness increased in the fusion zone and even more in the heat affected zone of HCT980X steel, which was the consequence of martensite and bainite formation in these areas. The tensile strength of joints achieved the strength of the HCT600X steel and all joints fractured in the HCT600X base metal.</span></p>

Effects of Microstructure and Texture on DWTT Properties for High Strength Line Pipe Steels

2006 ◽  
Author(s):  
Takuya Hara ◽  
Yasuhiro Shinohara ◽  
Hitoshi Asahi ◽  
Yoshio Terada
Keyword(s):  
Tensile Strength ◽  
High Intensity ◽  
Single Phase ◽  
High Strength ◽  
Rolling Plane ◽  
Dual Phase ◽  
Pipe Steels ◽  
Dual Phase Steels ◽  
Line Pipe ◽  
Plane Parallel

The crack arrestability for high strength line pipe steels with tensile strength of 650 to 850 MPa was evaluated using precrack DWTT (pc-DWTT). Moreover, the effects of microstructure and texture on pc-DWTT energy were investigated. The pc-DWTT energy was remarkably affected by tensile strength. The pc-DWTT energy of ferrite and bainite/martensite dual phase steels was much higher than that of bainite single phase steels in comparison with the same tensile strength. The {100} plane is a cleavage plane in iron, so the brittle crack mainly propagates along the {100} plane. Bainte single phase steels indicated a high intensity of the {100} on the plane rotated 40° from the rolling plane with the axis of the rolling direction. On the other hand, ferrite and bainite/martensite dual phase steels indicated not only a high intensity of the {100} plane rotated 40° from the rolling plane, but also a high intensity of the {100} plane parallel to the rolling plane. Slant fracture could be easily formed by the high intensity of the {100} on the plane rotated 40° from the rolling plane if local brittle areas such as martensite and austenite constituent (M-A constituent), which became the initiation point of brittle fracture, existed. In contrast, separation tended to be formed by the high intensity of the {100} plane parallel to the rolling plane that was caused by the formation of ferrite and bainte/martensite dual phase microstructure. Thus, pc-DWTT energy and shear area were remarkably affected by microstructure and texture. Therefore, to control microstructure and texture is vay important for the improvement of pc-DWTT properties.

MITTAL DI-FORM T590, T600

Alloy Digest ◽  
2007 ◽  
Vol 56 (1) ◽  
Keyword(s):  
Tensile Strength ◽  
Automotive Industry ◽  
High Strength ◽  
Martensite Phase ◽  
Ferrite Phase ◽  
Dual Phase ◽  
Bend Strength ◽  
Low Carbon ◽  
Advanced High Strength Steel ◽  
Soft Ferrite

Abstract MITTAL DI-FORM T590 and T600 are low-carbon dual-phase steels containing manganese and silicon. Dual-phase (DP) steels are important advanced high-strength steel (AHSS) products developed for the automotive industry. Their microstructure typically consists of a soft ferrite phase with dispersed islands of a hard martensite phase. The martensite phase is substantially stronger than the ferrite phase. The DI-FORM grades exhibit low yield-to-tensile strength ratios. The numeric designation in the grade name corresponds to the tensile strength in MPa. This datasheet provides information on microstructure, tensile properties, and bend strength as well as fatigue. It also includes information on forming. Filing Code: SA-558. Producer or source: Mittal Steel USA Flat Products.

CONTROL OF MICROSTRUCTURES OF FERRITE/ BAINITE (F/B) DUAL-PHASE STEELS AND ANALYSIS OF THEIR RESISTANCE TO DEFORMATION BEHAVIOR

2012 ◽  
Vol 48 (3) ◽  
pp. 298 ◽  
Author(s):  
Wenjin NIE ◽  
Chengjia SHANG ◽  
Hailong GUAN ◽  
Xiaobing ZHANG ◽  
Shaohui CHEN
Keyword(s):  
Deformation Behavior ◽  
Dual Phase ◽  
Dual Phase Steels ◽  
Resistance To Deformation
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