Effect of Micro-Segregation on Impact Toughness of 2.25Cr-1Mo Steel after Post Weld Heat Treatment

Na, Hye-Sung; Lee, Sanghoon; Kang, Chung Gil

doi:10.3390/met8060373

Cited by 4 publications

(3 citation statements)

References 29 publications

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“…At the same time, residual austenite gradually transformed into martensite that is dark. In addition, segregations had been discovered in the steel before tempering [19,20]. The stability of the material properties may be affected by these segregations.…”

Section: Resultsmentioning

confidence: 99%

Study on the microstructure and impact fracture behavior of martensitic alloy steels

Zheng¹,

Long²,

Zheng³

et al. 2020

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Martensitic steels used for ball mill liners were prepared. The effect of tempering on the microstructures, Rockwell hardness, and impact toughness of the tested steels was evaluated at room temperature. The fracture morphologies were observed by using metallurgical microscopy, scanning electron microscopy and energy-dispersive spectroscopy. The results showed that tempering decreased the Rockwell hardness and significantly improved the impact toughness of the tested steel. However, the impact toughness of the tempered steels was unstable. Fracture of the tested steel before tempering was quasi-cleavage fracture; however, it changed to ductile and quasi-cleavage fracture after tempering. Carbide segregations formed at the local grain boundaries became the crack source and were the preferred ways for crack propagation during the impact test. The existence of segregations was inferred to be the main reason for the fluctuation of impact toughness. K e y w o r d s : martensitic steel, tempering, mechanical properties, fracture

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Section: Resultsmentioning

confidence: 99%

Study on the microstructure and impact fracture behavior of martensitic alloy steels

Zheng¹,

Long²,

Zheng³

et al. 2020

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“…2.25Cr-1Mo steel has been extensively used in pressure vessels and pipeline systems in petroleum and power industries owing to its good mechanical properties at elevated temperatures [22]. The mechanical behavior of 2.25Cr-1Mo steel under static creep, low-cycle fatigue, and creep-fatigue interaction conditions has been studied by Klueh [23], Jaske [24], and Challenger et al [25].…”

Section: Introductionmentioning

confidence: 99%

Cyclic Creep Behavior and Modified Life Prediction of Bainite 2.25Cr-1Mo Steel at 455 °C

Jiang

Ogunmola

Zhao

et al. 2020

Metals

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Uniaxial static and cyclic creep tests were carried out on bainite 2.25Cr-1Mo steel at 455 °C. Effects of the unloading rate from 0.6 to 39 MPa/s and valley stress duration from 0 to 30 min on the cyclic creep deformation behavior were discussed. The results indicated that the fracture behavior under static and cyclic creep conditions showed a consistent ductile mode. The strain accumulation rate under cyclic creep was significantly retarded as compared with static creep due to the presence of anelastic recovery which was apparently influenced by the unloading conditions. For cyclic creep tests, the unrecoverable strain component determined by a systematic classification of the stress–strain curve was the true damage. A modified life prediction method proposed based on the unrecoverable strain component presented a good life prediction for cyclic creep.

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“…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]. MnS can also refine the matrix grains by suppressing austenite growth with the pinning effect of MnS-rich precipitates [6] and facilitate acicular ferrite nucleation in the coarse-grained zone so as to promote fractions of the high-toughness phase [7,8].…”

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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Effect of Micro-Segregation on Impact Toughness of 2.25Cr-1Mo Steel after Post Weld Heat Treatment

Cited by 4 publications

References 29 publications

Study on the microstructure and impact fracture behavior of martensitic alloy steels

Study on the microstructure and impact fracture behavior of martensitic alloy steels

Cyclic Creep Behavior and Modified Life Prediction of Bainite 2.25Cr-1Mo Steel at 455 °C

Cross-Scale Modeling of MnS Precipitation for Steel Solidification

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