Heat affected zone microstructures and their influence on toughness in two microalloyed HSLA steels

Hutchinson, Bevis; Komenda, Jacek; Rohrer, Gregory S.; Beladi, Hossein

doi:10.1016/j.actamat.2015.05.055

Cited by 73 publications

(16 citation statements)

References 21 publications

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“…Incomplete precipitation of carbides and nitrides occurs during fast cooling after welding, which resulted in an increase in the amount of uncombined C and N in solid solution in the as-welded condition. Higher dislocation density in the HAZ of the welds can also be seen owing to development of strains during the thermal cycle of welding and in later loading in the DSA temperature range, that is, inside of the crack tip plastic zone [11,12].…”

Section: Methodsmentioning

confidence: 99%

Dynamic Strain Aging Behaviour in AISI 316L Austenitic Stainless Steel under As-Received and As-Welded Conditions

Muhamed

Gündüz

Erden

et al. 2017

Metals

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In the current study, dynamic strain ageing (DSA) phenomena in 316L austenitic stainless steel was investigated under as-received and as-welded conditions. A tensile test was carried out on as-received and as-welded samples for the temperatures of 25-800 • C at a strain rate of 1 × 10 −3 s −1 . Microstructure and fracture surfaces were investigated by optic and scanning electron microscopes (SEM). 316L austenitic stainless steel showed different DSA behavior under as-received and as-welded conditions, which are discussed in terms of microstructure and mechanical properties.

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Section: Methodsmentioning

confidence: 99%

Dynamic Strain Aging Behaviour in AISI 316L Austenitic Stainless Steel under As-Received and As-Welded Conditions

Muhamed

Gündüz

Erden

et al. 2017

Metals

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“…This theoretically results in the formation of 12 or 24 distinct crystallographic equivalent variants/orientations from a given parent austenite crystal depending on the orientation relationship. The inter-variant boundaries, resulted from the impingement of these variants, play a significant role in controlling the crack propagation path and consequently the fracture toughness of the steel [3,4].…”

Section: Introductionmentioning

confidence: 99%

On the crystallographic characteristics of nanobainitic steel

et al. 2017

Self Cite

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This study aims to elucidate the crystallographic characteristics of bainite transformed in a temperature range of 200-350°C, where a nanobainitic structure is formed. The microstructure, consisting of bainitic ferrite laths and retained austenite, became significantly refined and its crystallographic arrangement changed with a decrease in the phase transformation temperature. At 200-250°C, the bainite packets mostly consisted of one or more blocks (i.e. bainitic ferrite laths and retained austenite lamellae) with different orientations, having a common habit plane. Some of the bainitic laths formed in this temperature range were composed of small segments with similar orientations, while others displayed a ragged morphology with small protrusions, suggesting face-to-face and face-to-edge sympathetic nucleation, respectively. At 300-350°C, the latter nucleation mechanism appeared to be dominant, as bainite packets mostly consisted of two sets of bainitic ferrite laths with similar orientations and inclined to each other (i.e. having different habit planes). In general, all rational orientation relationships (ORs) ranging from Kurdjumov-Sachs (K-S) through to Nishiyama-Wassermann (N-W) were observed within the transformation temperature range. The N-W OR was dominant at 350°C and progressively changed towards the K-S OR, which was prevalent at 200°C. The five-parameter crystallographic approach was used to statistically measure the habit plane distributions for both bainitic ferrite and retained austenite, which were generally found to be irrational and exhibited a significant anisotropy. The bainitic ferrite interface plane distribution displayed a wide peak spreading from (101) to (535). The retained austenite revealed a maximum at the (111) orientation, extending towards the (554).

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“…Based on Hutchinson et al [7], calculated by the composition of steel, the phase transition temperature during heating process (Ac1 and Ac3) of the test steels are as shown in Table 3, which is about 700 °C and 830 °C, respectively. However, under the condition of rapid heating, phase transformation temperature is significantly increased [16], by the expansion method determining the Ac1 and Ac3 of the test steels are shown in Table 3, which is about 730 °C and 925 °C, respectively, i.e., the steels were austenitized completely when the temperature is higher than 925 °C.…”

Section: Effect Of Peak Temperature On Microstructurementioning

confidence: 99%

“…In order to improve the transportation efficiency and reduce the transportation cost of oil and gas pipelines, pipeline transportation has been developed to large diameter and thick wall, and the requirements for the strength and toughness of pipeline steel are also becoming higher [1][2][3][4].To the turn of the century, large diameter (ϕ 1219/1422 mm), thick-walled X80 pipeline (t≥8.4 mm) has become a modern [5][6][7][8][9] choice for pipeline construction, such as the second and third west-east gas line in China, the central Asia gas pipeline, the Russia's ucha pipeline, and the China to Russia pipeline which is been built, etc. With the mature development of metallurgical technology, the development and research of the higher level X90-X120 pipeline steels are also promoted on the basis of X80 steel research and application.…”

Section: Introductionmentioning

confidence: 99%

Behaviors of Embrittlement and Softening in Heat Affected Zone of High Strength X90 Pipeline Steels

Xiao

Zhou

et al. 2019

Soldag. insp.

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The embrittlement and softening behaviors in heat affected zone of X90 pipeline steel were studied, and the influence of weld thermal cycle on microstructure and mechanical properties were discussed by combining the effect of peak temperature on the phase transition point (Ar3). Results show that there are embrittlement and softening zones existed in heat affected zone of X90 pipeline steel. The peak temperature greatly affected the austenitizing and its grain size, thereby affected phase transition during cooling process. The embrittlement in critical heat affected zone at 750 °C was caused by brittle bainite and M /A islands formed during cooling, because little austenite was formed during heating. While, the embrittlement in coarse grain heat affected zone was caused by austenite grain coarsen, which transformed to the coarse bainite after cooling. The softening zone attributed to the polygonal ferrite and granular ferrite after cooling, which came from fine and ununiformed austenite formed during reheating process. Ar3

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Heat affected zone microstructures and their influence on toughness in two microalloyed HSLA steels

Cited by 73 publications

References 21 publications

Dynamic Strain Aging Behaviour in AISI 316L Austenitic Stainless Steel under As-Received and As-Welded Conditions

Dynamic Strain Aging Behaviour in AISI 316L Austenitic Stainless Steel under As-Received and As-Welded Conditions

On the crystallographic characteristics of nanobainitic steel

Behaviors of Embrittlement and Softening in Heat Affected Zone of High Strength X90 Pipeline Steels

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