Dependence of Elevated Temperature Intergranular Cracking on Grain Size and Bulk Sulfur Content in TP347H Austenitic Stainless Steels

Heo, N. H.; Hong, Chang-Wan; Heo, Yoon-Uk; Kang, Myung Hoon; Yoo, Keun Bong; Kim, Sung-Joon

doi:10.2355/isijinternational.isijint-2015-721

Cited by 9 publications

(4 citation statements)

References 31 publications

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“…However, after long-term service, austenitic stainless steels became vulnerable attributing to microstructure degradation [2][3][4], including precipitation and coarsening of chromium carbides, depletion of chromium along grain boundaries, coarsening of strengthening second phases, and formation of deformation-induced martensite. Intergranular attack is one of the main failure modes for austenitic stainless steels faced with the high-temperature water or molten salt during the long-term exposure in thermal power plants [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

“…Nb-stabilised TP347H can effectively prevent sensitisation related intergranular corrosion failures due to the stronger affinity between Nb and C than that between Cr and C [2], but it does not mean the TP347H is immune to intergranular attacking. The segregation of impurities (S and P) to grain boundaries contribute to intergranular cracking due to lowering the grain boundary cohesion strength [7,16]. Elevated temperature can promote Cr diffusion along grain boundaries and facilitate corrosion attacking along the grain boundaries [5].…”

Section: Introductionmentioning

confidence: 99%

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Investigation on thermo-mechanical processing and intergranular corrosion of TP347H stainless steel

Gao

Wang

Liu

et al. 2021

Materials Science and Technology

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The grain boundary character distributions of TP347H stainless steel after different thermo-mechanical processes in terms of grain boundary engineering (GBE) were investigated by EBSD. DL-EPR and electrolytic oxalic acid etch tests were carried out to evaluate the improvement of GBE treatment on intergranular corrosion. The low-Σ CSL grain boundary proportion of the TP347H can be increased to about 90% through a single-step thermo-mechanical treatment consisted of a slight tensile deformation (3%) and subsequent annealing process at 1150°C for 1 h. Compared with conventional TP347H, the optimum GBE microstructure suppressed intergranular corrosion due to the high proportion of low-Σ CSL grain boundaries, particularly the twin (Σ3) boundaries which is almost immune to intergranular corrosion.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation on thermo-mechanical processing and intergranular corrosion of TP347H stainless steel

Gao

Wang

Liu

et al. 2021

Materials Science and Technology

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“…MnS precipitation plays an entirely different role in the performance of steel. It is seriously detrimental to intergranular cracking due to the precipitation reaction within solidifying metal acting as a strong sink of free sulfur segregation to the grain boundaries [1], thus decreasing corrosion resistance by accelerating hydrogen absorption into the matrix [2] and weakening the hot ductility because boundary sliding is enhanced at austenite grains [3]. The lower modulus and hardness of MnS inclusions compared to those of a matrix give rise to a drop in the fatigue strength of steel [4], while the machinability is amended simultaneously [5].…”

Section: Introductionmentioning

confidence: 99%

Cross-Scale Modeling of MnS Precipitation for Steel Solidification

Meng

Gao

Huang

et al. 2018

Metals

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One of the advantages of numerical simulations over traditional experimental methodologies is that they can synchronize nucleation, growth and coarsening during solidification from the point of view of microstructural analysis. However, the computational cost and accuracy are bottlenecks restricting simulation approaches. Here, two cellular automaton (CA) modules with different grid dimensions are coupled to form a cross-scale model in order to simulate MnS precipitation, accompanied by the matrix growth of dendrites during the solidification of a Fe-C-Mn-S steel, where the matrix growth is computed through the CA module with large grids based on the solute conservation and the undercooling of thermal, constitutional, and curvature, and increments of solid fraction of MnS are solved in combination with the transient thermodynamic equilibrium on the locally re-meshed grids once the MnS precipitation is formed. We utilize the cross-scale mode to illustrate MnS evolution in a solidifying matrix and explain the reason why it coexists in three shapes. Further, we study the effects of the content of elements Mn and S on MnS precipitation based on two continuously cast steel objects, with the factor of concentration product fixed as a constant. A re-precipitation of MnS is observed during the solidification of a system with a high content of Mn and low content of S. Simultaneous computation using cross-scale modeling can effectively save on computational resources, and the simulation results agree well with the experimental cases, which confirm its reliable accuracy.

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“…(1) 关键词主要集中在材料的力学性能方面，如 Brittle-Ductile Transition [7-13]、Mechanical Properties [14][15][16][17][18] 、 Deformation [19][20][21][22][23][24] 、 Fracture [25][26][27][28][29][30] 、 Toughness [31][32][33][34]、Strength [33,[35][36][37][38][39]、Brittle [40][41][42][43][44][45]、 Plasticity [46][47][48][49][50][51] [110,111]。磷元素是也钢中一种常见的微量元素，其含量一般在 0.005%~0.04%之间 [112,113] [122,125,126] [13] Murray G T. Brittle-Ductile Transition Temperatures in Ionic Crystals [J]. Journal of the American Ceramic Society, 1960, 43(6): 330-334.…”

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Research Progress on the Ductile-to-Brittle Transition of Metal Materials: The Impact of FATT50

Liu,

Tan

2024

mater

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In low-temperature conditions, the ductile-to-brittle transition behavior of metal materials is crucial for the safety of engineering structures. This transition leads to the rapid expansion of cracks and could potentially result in accidents. Through retrieval and analysis of the Web of Science database, it was found that research on ductile brittle transition has shown a significant growth trend since 1990, with increasing international collaboration, primarily led by countries such as China, the United States, and Japan. Keyword analysis indicates a primary focus on aspects such as the mechanical properties of materials, the impact of composition on ductility and brittleness, microstructure, and temperature. This paper focuses on FATT50 (Fracture Appearance Transition Temperature at 50% Fracture Probability), 81 刘继江等：金属材料韧脆转变研究进展：FATT50 的影响 http://www.materialsrd.com comprehensively reviewing domestic and international standards for FATT50. It deeply analyzes the interrelationships between FATT50 and key factors such as material chemical composition, microstructure, and heat treatment. The study reveals that FATT50 is influenced by these factors collectively, especially in terms of chemical composition, microalloying elements, and impurities, which can significantly improve the low-temperature brittleness of metals and subsequently affecting the FATT50 temperature. Changes in microstructure may lead to increased brittleness of metals at low temperatures. Furthermore, the choice of heat treatment process also has a significant impact on FATT50, and adjustments in temperature and time can effectively improve or exacerbate the performance of metals at low temperatures. This research provides valuable insights for understanding and optimizing the performance of metal materials under low-temperature conditions, offering important guidance for engineering practices and materials design.

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Dependence of Elevated Temperature Intergranular Cracking on Grain Size and Bulk Sulfur Content in TP347H Austenitic Stainless Steels

Cited by 9 publications

References 31 publications

Investigation on thermo-mechanical processing and intergranular corrosion of TP347H stainless steel

Investigation on thermo-mechanical processing and intergranular corrosion of TP347H stainless steel

Cross-Scale Modeling of MnS Precipitation for Steel Solidification

Research Progress on the Ductile-to-Brittle Transition of Metal Materials: The Impact of FATT50

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