Study of Fatigue Behavior for Spot Welded Tensile Shear Specimens of Advanced High Strength Steels

2012 ◽  
Vol 83 (10) ◽  
pp. 988-994 ◽  
Author(s):  
Gert Weber ◽  
Stephan Brauser ◽  
Holger Gaul ◽  
Michael Rethmeier
Keyword(s):  
Fatigue Behavior ◽  
High Strength Steels ◽  
High Strength ◽  
Tensile Shear ◽  
Advanced High Strength Steels ◽  
Spot Welded

scholarly journals Mechanical Strength and Fracture of Resistance Spot Welded Advanced High Strength Steels

2015 ◽  
Vol 109 ◽  
pp. 450-456 ◽  
Author(s):  
Pasquale Russo Spena ◽  
Manuela De Maddis ◽  
Franco Lombardi
Keyword(s):  
Mechanical Strength ◽  
High Strength Steels ◽  
High Strength ◽  
Resistance Spot ◽  
Advanced High Strength Steels ◽  
Spot Welded

scholarly journals Microstructural characterization and mechanical properties of spot welded dissimilar advanced high strength steels

2021 ◽  
Author(s):  
Muhammad Sohaib Khan
Keyword(s):  
Mechanical Properties ◽  
High Strength Steels ◽  
High Strength ◽  
Microstructural Characterization ◽  
Advanced High Strength Steels ◽  
Spot Welded

Microstructural characterization and mechanical properties of spot welded dissimilar advanced high strength steels

Investigations on the Mechanical Behavior of Advanced High Strength Steels Resistance Spot Welds in Cross Tension and Tensile Shear

2010 ◽  
Vol 89-91 ◽  
pp. 130-135 ◽  
Author(s):  
Sylvain Dancette ◽  
Véronique Massardier-Jourdan ◽  
Jacques Merlin ◽  
Damien Fabrègue ◽  
Thomas Dupuy
Keyword(s):  
Three Dimensional ◽  
High Strength Steels ◽  
Complex Loading ◽  
High Strength ◽  
Weld Strength ◽  
Tensile Shear ◽  
Spot Welds ◽  
Advanced High Strength Steels ◽  
Cross Tension ◽  
Failure Types

Advanced High Strength Steels (AHSS) are key materials in the conception of car body structures, permitting to reduce their weight while increasing their behavior in crash conditions. Nevertheless, the weldability of AHSS presents some particular aspects, in that complex failure types involving partial or full interfacial failure can be encountered more often than with conventional mild steels during destructive testing, despite high spot weld strength levels. This paper aims at characterizing the behavior of different AHSS spot welds under two quasi-static loading conditions, tensile shear and cross tension, often used in the automotive industry for the determination of their weldability. Interrupted cross tension and tensile shear tests were performed and spot welds failure was investigated with optical micrographs, SEM fractography and 3D-tomography in order to follow the three-dimensional crack paths due to the complex loading modes. A limited number of failure zones and damage mechanisms could be distinguished for all steel grades investigated. Moreover, numerical simulation of the tests was used to better understand the stress state in the weld and the influence of geometrical features such as weld size on the occurrence of the different failure types.

scholarly journals Effect of Quenching and Partitioning Heat Treatment on the Fatigue Behavior of 42SiCr Steel

Metals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1699
Author(s):  
Marco Thomä ◽  
Guntram Wagner
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Heat Treatment ◽  
Material Properties ◽  
Retained Austenite ◽  
Fatigue Behavior ◽  
High Strength Steels ◽  
High Strength ◽  
Advanced High Strength Steels ◽  
Scanning Electron

The manufacturing of advanced high-strength steels with enhanced ductility is a persistent aim of research. The ability of a material to absorb high loads while showing a high deformation behavior is a major task for many industrial fields like the mobility sector. Therefore, the material properties of advanced high-strength steels are one of the most important impact factors on the resulting cyclic fatigue behavior. To adjust advanced material properties, resulting in high tensile strengths as well as an enhanced ductility, the heat treatment process of quenching and partitioning (QP) was developed. The quenching takes place in a field between martensite start and martensite finish temperature and the subsequent partitioning is executed at slightly elevated temperatures. Regarding the sparsely investigated field of fatigue research on quenched and partitioned steels, the present work investigates the influence of a QP heat treatment on the resulting microstructure by light and scanning electron microscopy as well as on the mechanical properties such as tensile strength and resistance against fatigue regarding two different heat treatment conditions (QP1, QP2) in comparison to the cold-rolled base material of 42SiCr steel. Therefore, the microscopic analysis proved the presence of a characteristic quenched and partitioned microstructure consisting of a martensitic matrix and partial areas of retained austenite, whereas carbides were also present. Differences in the amount of retained austenite could be observed by using X-ray diffraction (XRD) for the different QP routes, which influence the mechanical properties resulting in higher tensile strength of about 2000 MPa for QP1 compared to about 1600 MPa for QP2. Furthermore, the transition for the fatigue limit was approximated by using stepwise load increase tests (LIT) and afterwards verified by constant amplitude tests (CAT) in accordance with the staircase method, whereas the QP 1 condition reached the highest fatigue strength of 900 MPa. Subsequent light and scanning electron microscopy of selected fractured surfaces and runouts showed a different behavior regarding the size of the fatigue fracture area and also differences in the microstructure of these runouts.

Methods to Obtain Weld Discontinuities in Spot-Welded Joints Made of Advanced High-Strength Steels

2011 ◽  
Vol 55 (11-12) ◽  
pp. 99-106 ◽  
Author(s):  
Holger Gaul ◽  
Stephan Brauser ◽  
Gert Weber ◽  
Michael Rethmeier
Keyword(s):  
Welded Joints ◽  
High Strength Steels ◽  
High Strength ◽  
Advanced High Strength Steels ◽  
Spot Welded

Failure Mode and Fatigue Behavior of Friction Stir Spot Welds in Lap-Shear Specimens of Dissimilar Advanced High Strength Steels

2013 ◽  
Vol 6 (2) ◽  
pp. 286-292 ◽  
Author(s):  
Seung Hoon Hong ◽  
Katherine Avery ◽  
Jwo Pan ◽  
Michael Santella ◽  
Zhili Feng ◽  
...  
Keyword(s):  
Failure Mode ◽  
Fatigue Behavior ◽  
High Strength Steels ◽  
High Strength ◽  
Spot Welds ◽  
Friction Stir ◽  
Advanced High Strength Steels ◽  
Lap Shear
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