Effects of continuous cooling rate on morphology of granular bainite in pipeline steels

Jia, Shujun; Ba, Li; Liu, Qingyou; Ren, Yi; Zhang, Shuai; Gao, Hong

doi:10.1007/s42243-019-00346-3

Cited by 28 publications

(5 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Grain size in each specimen was not quantified, so the contribution of the grain size could not be calculated. However, as CR increased, the grain size decreased and the hardness increased, so we infer that the grain refinement depending on the CR also influenced the increased hardness [ 18 , 20 , 46 ].…”

Section: Resultsmentioning

confidence: 99%

“…When dealing with bulk flanges of large dimensional size and complex structure, it should be taken into consideration that heat treatment would not be uniformly applied to each location of the products. However, most previous studies have tended to use standardized specimens [ 18 , 19 , 20 , 21 , 22 ] or sheet plates [ 9 , 16 ] of certain sizes to which uniform heat treatment can be applied within the specimens, so the results cannot be directly used to understand the bulk flanges. It is rather useful, especially from an industrial point of view, to investigate the effect of heat treatment on flanges by directly obtaining local properties of interest from the flanges under heat treatment processes.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effects of Cooling Rate during Quenching and Tempering Conditions on Microstructures and Mechanical Properties of Carbon Steel Flange

Kang

Park

et al. 2020

Materials

View full text Add to dashboard Cite

This study investigated the mechanical properties of steel in flanges, with the goal of obtaining high strength and high toughness. Quenching was applied alone or in combination with tempering at one of nine combinations of three temperatures TTEM and durations tTEM. Cooling rates at various flange locations during quenching were first estimated using finite element method simulation, and the three locations were selected for mechanical testing in terms of cooling rate. Microstructures of specimens were observed at each condition. Tensile test and hardness test were performed at room temperature, and a Charpy impact test was performed at −46 °C. All specimens had a multiphase microstructure composed of matrix and secondary phases, which decomposed under the various tempering conditions. Decrease in cooling rate (CR) during quenching caused reduction in hardness and strength but did not affect low-temperature toughness significantly. After tempering, hardness and strength were reduced and low-temperature toughness was increased. Microstructures and mechanical properties under the various tempering conditions and CRs during quenching were discussed. This work was based on the properties directly obtained from flanges under industrial processes and is thus expected to be useful for practical applications.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of Cooling Rate during Quenching and Tempering Conditions on Microstructures and Mechanical Properties of Carbon Steel Flange

Kang

Park

et al. 2020

Materials

View full text Add to dashboard Cite

show abstract

“…These characteristics suggested that the sintered 07Si03C steel microstructure could be termed as granular bainite [23]. The granular bainite was observed in some steels produced via continuous cooling [24,25] and one via hot rolling [26]. The microstructure given in Fig.…”

Section: Sintered 07si03c Steelmentioning

confidence: 94%

Effects of silicon carbide contents on the microstructure of sintered steels

Srijampan¹,

Wiengmoon²,

Nakornkaew³

et al. 2021

ScienceAsia

View full text Add to dashboard Cite

Silicon and carbon are common alloying elements in wrought steel production. A judicious content of silicon can prevent carbide precipitation. So silicon is commonly used in the production of carbide-free bainitic steel, which is one of advanced high strength steels. It was found previously that both silicon and carbon elements from silicon carbide additives can be alloyed to form iron-based powder compacts via sintering process. In this study, sintered steels were produced from mixtures of pre-alloyed Fe-0.50Mo-0.15Mn powder and various silicon carbide contents (1.0, 2.0, 3.0, and 4.0 wt.%) using 'press and sinter' process. Microstructures of sintered steels changed in accordance with added silicon carbide content. The microstructure consisting of ferrite plate and martensite/austenite constituent in the low silicon carbide-added steel was changed to the microstructure with martensite matrix in high silicon carbideadded steel. Surprisingly, diffusional phase transformations resulting in the formations of pearlite and inverse bainite were occurred prior to diffusionless martensitic transformation in high silicon carbide-added steel. The ultimate tensile strength and hardness of the studied sintered steels increased with increasing martensite volume fraction but dropped with the presence of grain boundary carbide networks.

show abstract

“…[ 39 ] Decreasing the cooling rate increases the partition of carbon from ferrite, increasing the size of granular bainitic ferrite matrix within the granular bainite while reducing the M/A constituents. [ 40 ] However, increasing the concentration of carbon within austenite would also reduce the cooling rate needed for the formation of martensite due to saturation of soluble carbon in the surrounding austenite. [ 20 ] Thus, granular bainite consists of ferrite matrix and fine M/A constituents as it is difficult to completely avoid the formation of M/A in high‐strength steel and bainitic steel TMCP.…”

Section: Microstructure Constituents Influencing Sscmentioning

confidence: 99%

A Review of the Factors That Can Increase the Risk of Sulfide Stress Cracking in Thermomechanical Controlled Processed Pipeline Steels

Hiew Sze Kei,

van Haaften,

Britton

et al. 2023

Adv Eng Mater

View full text Add to dashboard Cite

This review aims to improve our understanding of the important factors which influence the susceptibility of thermomechanical controlled processed (TMCP) steels to sulfide stress cracking (SSC). Mechanisms involved in hydrogen embrittlement (HE) from three perspectives are focused on: the microstructure constituents of TMCP steels; environmental factors; and fracture mechanism of SSC. Microstructures are reviewed as they affect the diffusion and trapping of hydrogen that can reduce the resistance to fracture. Environmental factors discussed highlight that when exposed to an aqueous H2S environment, a sulfide layer can form and influence the ingress of hydrogen, and this is affected by pH, temperature, and H2S partial pressure. Fracture is influenced by the nature of the crack tip and the crack tip plastic zone during crack propagation, and hydrogen can significantly affect crack tip growth. This review provides a critical assessment of the interplay between these three factors and aims to provide understanding to enhance our engineering approaches to manage and mitigate against fracture of TMCP steels.

show abstract

Effects of continuous cooling rate on morphology of granular bainite in pipeline steels

Cited by 28 publications

References 29 publications

Effects of Cooling Rate during Quenching and Tempering Conditions on Microstructures and Mechanical Properties of Carbon Steel Flange

Effects of Cooling Rate during Quenching and Tempering Conditions on Microstructures and Mechanical Properties of Carbon Steel Flange

Effects of silicon carbide contents on the microstructure of sintered steels

A Review of the Factors That Can Increase the Risk of Sulfide Stress Cracking in Thermomechanical Controlled Processed Pipeline Steels

Contact Info

Product

Resources

About