Effect of cooling rate on hot-crack susceptibility of duplex stainless steel

Li, Zhijun; Zhong, Honggang; Sun, Quanzhi; Xu, Zhengqi; Zhai, Qijie

doi:10.1016/j.msea.2008.11.036

Cited by 14 publications

(3 citation statements)

References 10 publications

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“…According to Figure 5a, it is known that the transition temperature of the liquid to δ-ferrite is around 1467.8 °C in DSS 2507 and 1482.7 °C in DSS 2507, respectively. Moreover, the cooling rate during the solidification process is in average 4 °C min À1 , which means the area fraction of δ-ferrite depends on temperature in the following relationship by Equation ( 6) in DSS 2507 and (7) in DSS 3207. f δ,2507 ¼ 1 À exp À6.9 Â 10 À4 1467.8 À T 0.07 1.5 (6) f δ,3207 ¼ 1 À exp À7.4 Â 10 À8 1482.7 À T 0.07 3.4 (7) In the casting processes, the quality of products is highly related to the grain structure during solidification, including grain size and morphology of microstructure. [34] Besides the kinetic analysis, the microstructure evolution in the solidified DSSs is investigated by EBSD, and the typical results of band contrast, phase map, and inverse pole figure (IPF) of DSS2507 after HT-CLSM observation are presented in Figure 6a-c.…”

Section: In Situ Characterization Of Solidification Of Dsss 2507 and ...mentioning

confidence: 99%

“…It is reported that the hot-crack susceptibility is related closely to the ferrite/austenite ratio during the solidification process of the steel. [7] Previously, the solidification process of steel was mainly investigated through postmortem analysis which will inevitably lose some important information about the solidification process. [8] The recent advancements in high-temperature confocal laser scanning microscope (HT-CLSM) have offered a great capability for real-time and continuous observation of phase transformation at high temperatures during the solidification process.…”

Section: Introductionmentioning

confidence: 99%

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Combination of In Situ Confocal Microscopy and Calorimetry to Investigate Solidification of Super‐ and Hyper‐Duplex Stainless Steels

Wang

Sukenaga

Shibata

et al. 2023

steel research int.

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The solidification processes of super‐ and hyper‐duplex stainless steels (i.e., UNS S32750 and S 33 207) are investigated in situ by a high‐temperature confocal laser scanning microscope (HT‐CLSM) and differential scanning calorimetry (DSC). The variations of δ‐ferrite phase fraction during solidification are measured quantitatively. The results show that liquid L→δ‐ferrite transformation first occurs at a certain degree of supercooling during the solidification process of steel. UNS S3DSS 3207 with a higher Cr content can result in a higher nucleation temperature and faster growth of δ‐ferrite compared to those of UNS S332750 steel. Moreover, both the liquidus (TL) and solidus temperatures (TS) are increased with the increasing Cr content, while TL increases greater than TS. Electron microscopies are used to quantify the fraction and composition of each phase. Scheil equation is employed to predict the distribution behavior of the main alloying elements in the solidification process, and the predicted results are consistent with the experimental findings. This study aims to provide real‐time experimental insights into the solidification kinetics of state‐of‐the‐art high‐alloy‐grade duplex steels and benefits for controlling the casting process in the real production of stainless steels.

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Section: In Situ Characterization Of Solidification Of Dsss 2507 and ...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Combination of In Situ Confocal Microscopy and Calorimetry to Investigate Solidification of Super‐ and Hyper‐Duplex Stainless Steels

Wang

Sukenaga

Shibata

et al. 2023

steel research int.

View full text Add to dashboard Cite

show abstract

“…Hot cracking has received much attention from many researchers, and it has been found that hot cracking usually occurs in the mushy zone where the solid fraction is close to one [7]. Numerous metals, such as aluminium alloys [8,9], magnesium alloys [10,11] and stainless steels [12], are susceptible to hot cracking. Some researchers have found that hot cracking is a complicated phenomenon that can be influenced by mechanical and non-mechanical factors [13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

The Role of Solidified Phases on the Hot Cracking of a Large-Size GH4742 Superalloy Ingot

Zhang,

Wang,

Liu

et al. 2024

Materials

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The effect of solidified phases on the hot cracking behaviour of a large-size GH4742 superalloy ingot produced using vacuum induction melting (VIM) is investigated in order to improve the quality of the final product. The results show that the solidification order of the ingot is γ matrix, MC carbide, η phase and γ′ phase. Among them, the MC carbide and the η phase solidified in the mushy zone. The volume fraction of both the η phase and the MC carbide in the cracked zone is higher than that in the non-cracked zone, and a significant number of η phases are distributed near the hot cracks. The formation of solidified phases not only induces stress concentration at η phase/γ matrix interfaces but also reduces the ability of liquid feeding during solidification, thus promoting hot crack formation. It is believed that by controlling the segregation degree of both Nb and Ti, the volume fraction of η phases and MC carbides can be reduced to prevent hot cracking of the GH4742 superalloy VIM ingot.

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Solidification Structure Refinement of 2205 Duplex Stainless Steel by Pulse Magneto‐Oscillation

Ni¹,

Wu²,

Zhong³

et al. 2015

TMS2015 Supplemental Proceedings

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Effect of cooling rate on hot-crack susceptibility of duplex stainless steel

Cited by 14 publications

References 10 publications

Combination of In Situ Confocal Microscopy and Calorimetry to Investigate Solidification of Super‐ and Hyper‐Duplex Stainless Steels

Combination of In Situ Confocal Microscopy and Calorimetry to Investigate Solidification of Super‐ and Hyper‐Duplex Stainless Steels

The Role of Solidified Phases on the Hot Cracking of a Large-Size GH4742 Superalloy Ingot

Solidification Structure Refinement of 2205 Duplex Stainless Steel by Pulse Magneto‐Oscillation

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