Microstructures from wire-fed laser welding of high strength steel grades

2020 ◽  
Vol 32 (2) ◽  
pp. 022050
Author(s):  
Alexander F. H. Kaplan ◽  
Matthias Höfemann ◽  
Eva Vaamonde ◽  
Anandkumar Ramasamy ◽  
Bert Kalfsbeek ◽  
...  
Keyword(s):  
Laser Welding ◽  
High Strength Steel ◽  
High Strength ◽  
Steel Grades

scholarly journals Overview of HSS Steel Grades Development and Study of Reheating Condition Effects on Austenite Grain Size Changes

Materials ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 1988
Author(s):  
Tibor Kvackaj ◽  
Jana Bidulská ◽  
Róbert Bidulský
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
High Strength Steel ◽  
Single Phase ◽  
Hsla Steel ◽  
High Strength ◽  
Strength Properties ◽  
Austenite Grain Size ◽  
Austenite Grain ◽  
Steel Grades

This review paper concerns the development of the chemical compositions and controlled processes of rolling and cooling steels to increase their mechanical properties and reduce weight and production costs. The paper analyzes the basic differences among high-strength steel (HSS), advanced high-strength steel (AHSS) and ultra-high-strength steel (UHSS) depending on differences in their final microstructural components, chemical composition, alloying elements and strengthening contributions to determine strength and mechanical properties. HSS is characterized by a final single-phase structure with reduced perlite content, while AHSS has a final structure of two-phase to multiphase. UHSS is characterized by a single-phase or multiphase structure. The yield strength of the steels have the following value intervals: HSS, 180–550 MPa; AHSS, 260–900 MPa; UHSS, 600–960 MPa. In addition to strength properties, the ductility of these steel grades is also an important parameter. AHSS steel has the best ductility, followed by HSS and UHSS. Within the HSS steel group, high-strength low-alloy (HSLA) steel represents a special subgroup characterized by the use of microalloying elements for special strength and plastic properties. An important parameter determining the strength properties of these steels is the grain-size diameter of the final structure, which depends on the processing conditions of the previous austenitic structure. The influence of reheating temperatures (TReh) and the holding time at the reheating temperature (tReh) of C–Mn–Nb–V HSLA steel was investigated in detail. Mathematical equations describing changes in the diameter of austenite grain size (dγ), depending on reheating temperature and holding time, were derived by the authors. The coordinates of the point where normal grain growth turned abnormal was determined. These coordinates for testing steel are the reheating conditions TReh = 1060 °C, tReh = 1800 s at the diameter of austenite grain size dγ = 100 μm.

Structure and Properties of High Power Laser Welding of High Strength Steel B450LAD for Vehicles

2008 ◽  
Vol 35 (12) ◽  
pp. 2047-2051 ◽  
Author(s):  
李亚玲 Li Yaling ◽  
黄坚 Huang Jian ◽  
高志国 Gao Zhiguo ◽  
吴毅雄 Wu Yixiong ◽  
阎启 Yan Qi
Keyword(s):  
Laser Welding ◽  
High Power ◽  
High Strength Steel ◽  
High Strength ◽  
Structure And Properties ◽  
High Power Laser ◽  
Power Laser

Research on Microstructure and Properties of Laser Welding DP1000 High-Strength Steel Weld Joints

2014 ◽  
Vol 41 (9) ◽  
pp. 0903003
Author(s):  
王金凤 Wang Jinfeng ◽  
王立君 Wang Lijun ◽  
杨立军 Yang Lijun ◽  
李慷 Li Kang ◽  
李笑雨 Li Xiaoyu ◽  
...  
Keyword(s):  
Laser Welding ◽  
High Strength Steel ◽  
High Strength ◽  
Steel Weld ◽  
Microstructure And Properties ◽  
Weld Joints

Structural Performance Evaluation of Built-Up Stub Steel Column with Various Steel Grades under Concentric Loading

2015 ◽  
Vol 764-765 ◽  
pp. 127-131
Author(s):  
Yang Yang ◽  
Kang Min Lee ◽  
Keun Yeong Oh ◽  
Sung Bin Hong
Keyword(s):  
Tensile Strength ◽  
High Strength Steel ◽  
Local Stability ◽  
Experimental Studies ◽  
High Strength Steels ◽  
High Strength ◽  
Design Criteria ◽  
Stability Criteria ◽  
Steel Grades ◽  
Concentric Loading

The current local stability criteria (KBC2009, AISC2010) are enacted through theoretical and experimental studies of ordinary steels, but the mechanical properties of high strength steels are different from ordinary steels. The high strength steel in the applicability of design criteria should be needed to review because of increasing market demanding for high strength steel in the high-rise and long span buildings. In this study, stub columns of H-shaped and box section with various steel grades subjected to concentric loading were investigated, and these steels were checked to the applicability of current local stability criteria. The difference between the ordinary steel and high strength steel was compared. As a result of comparison with various steel grades, most specimens were satisfied with the design criteria, but some specimens with lower tensile strength were not reached the required strength. It is considered that the uncertainty of material was the higher when the tensile strength of material was the lower.

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