Microstructure-based cleavage parameters in bainitic, martensitic, and ferritic steels

Jiang, Quanxin; Bertolo, Virgínia Morete Barbosa; Pallaspuro, Sakari; Popovich, Vera; Sietsma, Jilt; Walters, Carey L.

doi:10.1016/j.engfracmech.2023.109146

Engineering Fracture Mechanics

2023

DOI: 10.1016/j.engfracmech.2023.109146

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Microstructure-based cleavage parameters in bainitic, martensitic, and ferritic steels

Quanxin Jiang

Virgínia Morete Barbosa Bertolo

Sakari Pallaspuro

et al.

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Cited by 2 publications

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Influence of microalloying on precipitation behavior and notch impact toughness of welded high-strength structural steels

Schroeder,

Rhode,

Kannengiesser

2024

Weld World

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Microalloying elements such as Nb and Ti are essential to increase the strength of quenched and tempered high-strength low alloy (HSLA) structural steels with nominal yield strength ≥ 690 MPa and their welded joints. Standards such as EN 10025–6 only specify limits or ranges for chemical composition, which leads to variations in specific compositions between steel manufacturers. These standards do not address the mechanical properties of the material, and even small variations in alloy content can significantly affect these properties. This makes it difficult to predict the weldability and integrity of welded joints, with potential problems such as softening or excessive hardening of the heat-affected zone (HAZ). To understand these metallurgical effects, previous studies have investigated different microalloying routes with varying Ti and Nb contents using test alloys. The high-strength quenched and tempered fine-grained structural steel S690QL is the basic grade regarding chemical composition and heat treatment. To evaluate weldability, three-layer welds were made using high-performance MAG welding. HAZ formation was investigated, and critical microstructural areas were identified, focusing on phase transformations during cooling and metallurgical precipitation behavior. Isothermal thermodynamic calculations for different precipitations were also carried out. Mechanical properties, especially Charpy notch impact toughness, were evaluated to understand the influence of different microalloys on the microstructure of the HAZ and mechanical properties.

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Influence of microalloying on precipitation behavior and notch impact toughness of welded high-strength structural steels

Schroeder,

Rhode,

Kannengiesser

2024

Weld World

View full text Add to dashboard Cite

show abstract

Microstructure-based cleavage modelling to study grain size refinement and simulated heat affected zones of S690 high strength steel

Jiang

Bertolo

Popovich

et al. 2023

Materials Science and Engineering: A

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Microstructure-based cleavage parameters in bainitic, martensitic, and ferritic steels

Cited by 2 publications

References 38 publications

Influence of microalloying on precipitation behavior and notch impact toughness of welded high-strength structural steels

Influence of microalloying on precipitation behavior and notch impact toughness of welded high-strength structural steels

Microstructure-based cleavage modelling to study grain size refinement and simulated heat affected zones of S690 high strength steel

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