Morphology of Nonmetallic Inclusions and Mechanical Properties of High Strength Low- Alloy Structural Steels

1996 ◽  
Vol 87 (3) ◽  
pp. 154-160
Author(s):  
Yoshiyuki Tomita
Keyword(s):  
Mechanical Properties ◽  
Nonmetallic Inclusions ◽  
High Strength ◽  
Structural Steels

Cooling Curve Based Estimation of Mechanical Properties in High Strength Steel Welds

2016 ◽  
Vol 879 ◽  
pp. 1760-1765 ◽  
Author(s):  
Rahul Sharma ◽  
Uwe Reisgen
Keyword(s):  
Mechanical Properties ◽  
Welding Process ◽  
High Strength Steels ◽  
High Strength ◽  
Structural Steels ◽  
Cooling Time ◽  
Cooling Curve ◽  
Welding Parameters ◽  
Steel Welds ◽  
Welding Processes

The application of high strength steels in welded structures relies on easy to use quality assurance concepts for the welding process. For ferritic steels, one of the most common methods for estimating the mechanical properties of welded joints is the cooling time concept t8/5. Even without experimental determination, the calculation of cooling time with previously introduced formulas based on the welding parameters leads to good results. Because high strength structural steels and weld metals with a yield strength of 960 MPa contain higher quantities of alloying elements, the transformation start temperature Ar3 is found to be outside of the range of 800 °C to 500 °C. This leads to inadequate estimation results, as the thermal arrest caused by the microstructural transformation in this case is not considered. In this work the usage of the well-proven cooling time concept t8/5 is analyzed using high strength fine grained structural steels and suitable welding filler wires during gas metal arc and submerged arc welding processes. The results are discussed taking into account the microstructure and the transformation behavior. Based on the experimental work, an improved concept is presented.

scholarly journals Optimisation of chemical composition of high-strength structural steels for achieving mechanical property requirements

2021 ◽  
Author(s):  
Oleksandr Babachenko ◽  
Hanna Kononenko ◽  
Iryna Snigura ◽  
Nataliya Togobytska
Keyword(s):  
Mechanical Properties ◽  
Mechanical Property ◽  
Chemical Composition ◽  
High Strength ◽  
Interatomic Interaction ◽  
Structural Steels ◽  
Integral Model ◽  
Model Parameters ◽  
National Academy Of Sciences ◽  
Iron And Steel

In addition to thermomechanical treatment, one of the main factors affecting the mechanical properties of steel is the chemical composition. The chemical composition may vary for a special high-strength low-alloy steel to meet certain mechanical property requirements. This work presents an approach, based on the method of physical-chemical modelling developed at the Z.I. Nekrasov Iron and Steel Institute of the National Academy of Sciences of Ukraine, to optimise the chemical composition of high-strength structural steels. The principle of this method is to describe the chemical composition of a melt by a complex of integral model parameters of interatomic interaction, characterising the chemical and structural state of the melt. The experimental data were analysed to obtain the regression model for mechanical properties based on the parameters of interatomic interaction. Finally, a multi-criteria optimisation method was applied to obtain an optimal set of microalloying elements which ensure the required mechanical properties.

Study on Welding Technology of Low Alloy High Strength Steel

2019 ◽  
Vol 814 ◽  
pp. 242-247
Author(s):  
Min Hu
Keyword(s):  
Mechanical Properties ◽  
Welded Joints ◽  
High Strength Steel ◽  
Steel Sheet ◽  
Welding Current ◽  
High Strength ◽  
Structural Steels ◽  
Metallographic Analysis ◽  
Weld Width ◽  
Welding Technology

WELDOX series steels are commonly used structural steels. The effects of welding voltage, welding current and arc height on penetration and weld width of WELDOX960 steel sheet were studied. The mechanical properties and microstructure of WELDOX960E high strength steel welded joints were study by tensile, bending, impact, hardness and metallographic analysis.

scholarly journals High Temperature Mechanical Properties of High Strength Structural Steels Q550, Q690 and Q890

2018 ◽  
Vol 54 (6) ◽  
pp. 1609-1628 ◽  
Author(s):  
Lei Huang ◽  
Guo-Qiang Li ◽  
Xin-Xin Wang ◽  
Chao Zhang ◽  
Lisa Choe ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
High Strength ◽  
Structural Steels ◽  
High Temperature Mechanical Properties

Structure and Mechanical Properties of High-Strength Structural Steels

2018 ◽  
Vol 2018 (6) ◽  
pp. 528-532
Author(s):  
O. A. Bannykh ◽  
A. M. Sorokin ◽  
I. O. Bannykh ◽  
E. I. Lukin
Keyword(s):  
Mechanical Properties ◽  
High Strength ◽  
Structural Steels

scholarly journals Correction to: High Temperature Mechanical Properties of High Strength Structural Steels Q550, Q690 and Q890

2018 ◽  
Vol 54 (6) ◽  
pp. 1629-1629
Author(s):  
Lei Huang ◽  
Guo-Qiang Li ◽  
Xin-Xin Wang ◽  
Chao Zhang ◽  
Lisa Choe ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
High Strength ◽  
Structural Steels ◽  
High Temperature Mechanical Properties

Innovation and Processing of Novel Tough Ductile Ultra-High Strength Steels through TMR-DQP Processing Route

2014 ◽  
Vol 783-786 ◽  
pp. 1009-1014 ◽  
Author(s):  
Mahesh C. Somani ◽  
David A. Porter ◽  
L. Pentti Karjalainen ◽  
Pasi Suikkanen ◽  
R.D.K. Misra
Keyword(s):  
Mechanical Properties ◽  
Physical Simulation ◽  
High Strength Steels ◽  
High Strength ◽  
Structural Steels ◽  
Processing Route ◽  
Quenching And Partitioning ◽  
Direct Quenching ◽  
Thermomechanical Rolling ◽  
Ultra High Strength Steels

Based on the recent concept of quenching and partitioning (Q&P), a novel TMR-DQP (thermomechanical rolling followed by direct quenching and partitioning) processing route has been established for the development of ultra-high strength structural steels with yield strengths ≈1100 MPa combined with good uniform and total elongations and impact toughness. Suitable compositions were designed based on high silicon and/or aluminium contents with or without small additions of Nb, Mo or Ni. The DQP parameters were established with the aid of physical simulation on a Gleeble simulator. Finally, the TMR-DQP processing route was designed for trials on a laboratory rolling mill. Metallographic studies showed that the desired martensite-austenite microstructures were achieved thus providing the targeted mechanical properties. The advantage of strained austenite in refining the martensite packets/blocks was clearly evident. No adverse effect of prolonged partitioning simulating the coiling stage has been noticed suggesting new possibilities for strip and plate products. Promising results in respect of microstructures and mechanical properties indicate that there are possibilities for developing tough ductile structural steels through the TMR-DQP route.

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