Micromechanical Testing of Fracture Initiation Sites in Welded High-Strength Low-Alloy Steel

Rogne, Bjørn Rune Sørås; Thaulow, Christian; Barnoush, Afrooz

doi:10.1007/s11661-013-2168-y

Cited by 6 publications

(8 citation statements)

References 49 publications

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“…Table 1. Literature values of the yield stress ( ys ) for several steels obtained through the micropillar compression technique, where DP: dual phase materials, TWIP: twining-induced plasticity, HSLA: highstrength low-alloy, ODS: oxide dispersion-strengthened steels, CDSS: cast duplex stainless steels, AHSS: advanced high strength steel, A: Austenite, F: Ferrite, M: Martensite, A/M: interface austenite/martensite, F/M: interfase ferrite/martensite, AS: as-sintered and T.T: thermal treatment [33][34][35][36][37][38][39][40][41][42][43][44][45]. The as-received material was ground with silicon carbide and then polished with diamond suspension of 30, 6 and 3 m.…”

Section: Introductionmentioning

confidence: 99%

Deformation of polycrystalline TRIP stainless steel micropillars

Roa

Wheeler

Trifonov

et al. 2015

Materials Science and Engineering: A

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The deformation mechanisms of the metastable austenite phase of a transformation induced plasticity (TRIP) stainless steel, AISI 301LN, have been investigated by compression of multicrystalline micropillars of different crystallographic orientations, with particular attention on the strain-induced phase transformation from austenite to martensite. Intergranular shearing and twinning were observed to be the primary deformation mechanisms, with a predominant <122> orientation developed in the austenitic phase, combined with limited planar slip within single grains of austenite. The phase transformation from austenite to ¿ and ¿’-martensite was clearly observed adjacent to the sheared regions using TEM-EBSD techniques. The ¿-martensite phase was found to be preferentially located in the regions near the grain boundaries which experienced higher shear stresses during compression.Peer ReviewedPostprint (author's final draft

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Section: Introductionmentioning

confidence: 99%

Deformation of polycrystalline TRIP stainless steel micropillars

Roa

Wheeler

Trifonov

et al. 2015

Materials Science and Engineering: A

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“…Low-alloy high-strength steel possesses excellent performance and remarkable economic benefits and is widely used in welded structures. To improve production efficiency and save cost, the welding structure design is developing in the direction of high parameters, such as lightweight and large scale [1][2][3][4][5]. Welding is a key technical problem affecting the application of low-alloy high-strength steel.…”

Section: Introductionmentioning

confidence: 99%

Effect of heat inputs on microstructure and mechanical properties in CGHAZ of BWELDY960Q steel

Qin¹,

Guo²,

Wang³

et al. 2021

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The Gleeble 1500 test machine was used to simulate the single-pass welding thermal cycle of BWELDY960Q steel under different heat input conditions. In this paper, microstructure observation and mechanical properties of BWELDY960Q steel specimens in coarse grain heat affected zone (CGHAZ) under different heat input conditions were investigated. The results show that under different heat input conditions, the microstructure of CGHAZ is lath martensite, granular bainite, or M-A constituent. As heat input increases, the number and size of the M-A constituent increase accordingly, and the microstructure gradually changes from lath martensite to granular bainite. Meanwhile, compared with the previous samples, the CGHAZ austenite grain diameter increases, and the grain size scale decreases. Furthermore, the value of the CGHAZ impact absorbing energy increases at first but then decreases, while microhardness monotonously decreases. At-20 • C compared with the base metal, the impact absorbing the energy of CGHAZ is significantly reduced, and embrittlement occurs. K e y w o r d s : BWELDY960Q steel, heat inputs, coarse grain heat affected zone, microstructure, mechanical properties

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“…70% of the steel needs to be welded. The quality of the welding structure directly determines the product quality and the safety and reliability of the components [11][12][13][14]. However, a large number of alloy elements are added into the smelting process of low alloy high-strength steel, which leads to a greater hardenability.…”

Section: Introductionmentioning

confidence: 99%

“…However, a large number of alloy elements are added into the smelting process of low alloy high-strength steel, which leads to a greater hardenability. After welding, weldability problems such as cracks, embrittlement and softening of heat affected zone easily appear, and especially the low-temperature impact toughness is not up to the requirements, which limits the wide use of the low-alloy high-strength steel in a wider range of applications [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

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Study on Improvement of Welding Technology and Toughening Mechanism of Zr on Weld Metal of Q960 Steel

Liu

2020

Materials

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Q960 high-strength steel is widely used in pressure vessels, bridges, offshore platforms and other important steel structural components because of its high strength and good plastic toughness, but alloy elements added to this kind of steel have strong hardenability, especially after welding, so the strength and toughness cannot meet the requirements, which limits its application in a wider range. In this paper, from the point of view of the metallurgical treatment of the weld, the goal is to improve the strength and toughness of the Q960 high strength steel weld metal In order to analyze the influence of Zr on the welding process of Q960 steel and the strengthening and toughening effect of weld metal, this paper takes Fe-Mn-Mo-Cr-Ni as the main alloy system, BaF2-CaF2-Al-Mg as the basic slag system, and adopts the method of melting consumable electrode self-shielded for welding, and analyzes the welding process, microstructure, tensile property and impact toughness of the welded joint. The experimental results show that when the weld metal contains 0.0061% Zr, the minimum spatter rate is only 7%, the maximum slag removal rate is 95%, the maximum hardness is 357HV, the maximum elongation is 34%, and the impact toughness is the highest. At this time, the acicular ferrite content in the weld microstructure is the highest, and there is a certain amount of equiaxed fine-grained ferrite, and the content of proeutectoid ferrite is the least, which effectively improves the strength and toughness of the weld metal.

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Micromechanical Testing of Fracture Initiation Sites in Welded High-Strength Low-Alloy Steel

Cited by 6 publications

References 49 publications

Deformation of polycrystalline TRIP stainless steel micropillars

Deformation of polycrystalline TRIP stainless steel micropillars

Effect of heat inputs on microstructure and mechanical properties in CGHAZ of BWELDY960Q steel

Study on Improvement of Welding Technology and Toughening Mechanism of Zr on Weld Metal of Q960 Steel

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