Post-weld heat treatment influence on galvanic corrosion of GTAW of 17-4PH stainless steel in 3·5%NaCl

Shoushtari, Mohammadreza Tavakoli; Moayed, Mohammad Hadi; Davoodi, Ali

doi:10.1179/174327809x409259

Cited by 26 publications

(11 citation statements)

References 16 publications

(66 reference statements)

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“…The observation of the current study is aligned with the previous reported results that ferrite formation in stainless steels is different among those with dissimilar compositions [2][3][4][5]10,11]. In the study, we found that ferrite formation in steel ingots was highly relevant to the mushy zone temperature.…”

Section: Discussionsupporting

confidence: 92%

“…Ferrite could be also formed during the forging process for implementing an inappropriate high temperature in thermal treatment, or an overtime heat preservation procedure [2,3]. Ferrite formation, in correspondence to temperature, was estimated by Equation (4).…”

Section: Discussionmentioning

confidence: 99%

“…Equation (2) [6,7] below was applied to simulate shrinkage styles and ferrite formation in steel forming process.…”

Section: Computational Modeling To Predict Ferrite Forming In Correlamentioning

confidence: 99%

“…The material data of this chromium rich GB/T 3280 stainless steel has been provided by Metalinfo, Eagle International Software [1], with the following mass percent composition (wt %): C 0.04%-0.07%, silicon (Si) 0.3%-1%, manganese (Mn) 0.7%-1%, phosphorum (P) 0.02%-0.04%, sulfur (S) 0.01%-0.03%, Cr 15%-17.5%, Ni 3%-5%, Niobium (Nb) 0.35%-0.45%, Cu 3%-5%, Molybdenum (Mo) 0.3%-0.5%, and Iron (Fe) 72-73.2%. 0Crl7Ni4Cu4Nb is of duplex ferrite-austenite microstructure, and is excellent in corrosion resistance and mechanical stability [2]. It is widely used in aerospace, turbine blades, the food industry, offshore platforms, and synthetic fiber mold manufacturing.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Novel Formation of Ferrite in Ingot of 0Cr17Ni4Cu4Nb Stainless Steel

Han¹,

Yu²,

Dessau³

et al. 2018

Preprint

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Abstract:The ferrite body is the origin of crack and corrosion initiation of steels. Distribution and density of ferrite in seven steel ingots were examined by light optical microscopy and computational modeling, in the study, to explore the correlation of ferrite formation to chemical composition and the mushy zone temperature in ingot forming. The central segregation phenomenon in ferrite distribution was observed in all the examined steel specimens, except 0Cr17Ni4Cu4Nb stainless steel. No significant difference was found in the distribution and density of ferrite among zones of the surface, 1 2 radius, and core in neither the risers nor tails of 0Cr17Ni4Cu4Nb ingots. Additionally, fewer ferrites were found in 0Cr17Ni4Cu4Nb compared to other examined steels. The difference of ferrite formation in 0Cr17Ni4Cu4Nb elicited a debate on the traditional models explicating ferrite formation. Considering the compelling advantages in mechanical strength, plasticity, and corrosion resistance, further investigation on the unusual ferrite formation in 0Cr17Ni4Cu4Nb would help understand the mechanism to improve steel quality. In summary, we observed that ferrite formation in steel was correlated with the mushy zone temperature. The advantages of 0Crl7Ni4Cu4Nb in corrosion resistance and mechanical stability could be the result of fewer ferrites being formed and distributed in a scattered manner in the microstructure of the steel.

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Section: Discussionsupporting

confidence: 92%

Section: Discussionmentioning

confidence: 99%

“…Equation (2) [6,7] below was applied to simulate shrinkage styles and ferrite formation in steel forming process.…”

Section: Computational Modeling To Predict Ferrite Forming In Correlamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Novel Formation of Ferrite in Ingot of 0Cr17Ni4Cu4Nb Stainless Steel

Han¹,

Yu²,

Dessau³

et al. 2018

Preprint

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“…It is noticeable that the microstructure of HAZ (Figure 3a) and base metal (Figure 3b) show a great difference. Martensite lath is dissolved and the grain boundaries of prior austenite become obvious (Figure 3a), which correlates with Figure 2 [9,10]. The microstructure of 17-4PH after PTAW may be affected by two processes, namely, (1) element diffusion during welding and (2) welding heat input and welding cold cycle after PTAW.…”

Section: Resultssupporting

confidence: 56%

Microstructural Study of 17-4PH Stainless Steel after Plasma-Transferred Arc Welding

et al. 2015

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Abstract:The improvement of the surface qualities and surface hardening of precipitation hardened martensitic stainless steel 17-4PH was achieved by the plasma-transferred arc welding (PTAW) process deposited with Co-based alloy. The microstructure of the heat affected zone (HAZ) and base metal were characterized by optical microscope (OM), scanning electron microscope (SEM) and transmission electron microscope (TEM). The results show that there are obvious microstructural differences between the base metal and HAZ. For example, base material is transformed from lath martensite to austenite due to the heateffect of the welding process. On the other hand, the precipitate in the matrix (bar-like shape Cr7C3 phase with a width of about one hundred nanometres and a length of hundreds of nanometres) grows to a rectangular appearance with a width of about two hundred nanometres and a length of about one micron. Stacking fault could also be observed in the Cr7C3 after PTAW. The above means that welding can obviously improve the surface qualities.

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Precipitation and Transformation of Carbides during Tempering of 7Cr14 Martensitic Stainless Steel

Wang,

Li,

et al. 2023

steel research int.

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The precipitation and transformation of carbides in steel are gaining more interest since they are closely related to the properties of steel. Here, the precipitation and transformation of carbides during tempering of the 7Cr14 martensitic stainless steel subjected to high temperature solution treatment (HTST) were investigated. The results indicate that the precipitation of M3C (300∽333°C) and M23C6 (612∽645°C) carbides occurs during tempering of the HTST steel. The effective precipitation activation energies of M3C and M23C6 carbides are 120±7 kJ/mol and 272±13 kJ/mol, respectively. The precipitation processes of M3C and M23C6 carbides are dominated by C and Cr atomic diffusion, respectively. Moreover, it is found that two transformation processes occur during the tempering with increasing the temperature, namely, M3C carbides dissolve in the matrix and then M23C6 carbides precipitate along the boundaries of martensitic laths; and the plate‐like M3C carbides decompose into several globular or rod‐like M23C6 carbides that arrange in a chain‐like morphology.This article is protected by copyright. All rights reserved.

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Post-weld heat treatment influence on galvanic corrosion of GTAW of 17-4PH stainless steel in 3·5%NaCl

Cited by 26 publications

References 16 publications

Novel Formation of Ferrite in Ingot of 0Cr17Ni4Cu4Nb Stainless Steel

Novel Formation of Ferrite in Ingot of 0Cr17Ni4Cu4Nb Stainless Steel

Microstructural Study of 17-4PH Stainless Steel after Plasma-Transferred Arc Welding

Precipitation and Transformation of Carbides during Tempering of 7Cr14 Martensitic Stainless Steel

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