The role of microstructure and grain orientations on intergranular cracking susceptibility of UNS 17400 martensitic stainless steel

Masoumi, Mohammad; Tavares, Sérgio Souto Maior; Pardal, Juan Manuel; Martins, Tabatta Regihna Brito; Silva, Marcelo José Gomes da; Abreu, Hamilton Ferreira Gomes de

doi:10.1016/j.engfailanal.2017.04.008

Cited by 15 publications

(6 citation statements)

References 30 publications

(33 reference statements)

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“…The Moderate Taylor factor grains easily achieved the critical resolved shear stress with modest grain rotation. While in high Taylor factor grains or hard grains the slip planes cannot be achieved by rotation 50,51 . The results showed that the lowest distribution of Taylor factors was obtained in Q&P 650 sample due to the dominance of {011} planes.…”

Section: Resultsmentioning

confidence: 99%

Improvement of wear resistance in a pearlitic rail steel via quenching and partitioning processing

Masoumi

Echeverri

Tschiptschin

et al. 2019

Sci Rep

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Improvement of wear resistance and mechanical performance of rails used in heavy-haul railway are essential to reduce railroad maintenance costs. A novel heat treatment based on quenching and partitioning (Q&P) processing was proposed to improve the wear resistance of a hypereutectoid pearlitic rail. 50% of austenite was transformed into martensite under an interrupted quenching from full austenitization temperature to 140 °C. A multiphase microstructure resulted from the quenching and partitioning process, consisting of tempered martensite, bainite, retained austenite, and pearlite colonies. The partitioning step was performed in the range of 350–650 °C. Microstructure characteristics were investigated using scanning electron microscopy, microhardness measurements, X-ray and electron backscattered diffraction. Uniaxial tensile and pin-on-disc tests were also performed to evaluate the mechanical properties and wear resistance. The best combination of wear resistance and mechanical performance was obtained in samples partitioned at 450 and 550 °C, which may be applied in the railway industries.

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Section: Resultsmentioning

confidence: 99%

Improvement of wear resistance in a pearlitic rail steel via quenching and partitioning processing

Masoumi

Echeverri

Tschiptschin

et al. 2019

Sci Rep

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“…This demonstrates that D p and D b increased with increasing T t from 650 °C to 720 °C. The grain boundary misorientation angle (GBMA) might play a significant role in controlling SSC resistance by affecting hydrogen permeability [20,34] and crack propagation [21,26]. Therefore, the GBMA distribution of martensitic substructure in each Q&T–treated sample was also analyzed via EBSD and the fraction of the HAGBs, f GBMA≥15° , is summarized in Table 2.…”

Section: Resultsmentioning

confidence: 99%

“…However, these high-strength martensitic steels normally have a high susceptibility to sulfide stress cracking (SSC)/hydrogen-induced cracking (HIC) [1]. Therefore, there have been extensive efforts [7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22] to understand the mechanisms governing SSC/HIC behaviors and to achieve the desired combination of high strength, high toughness and superior SSC/HIC resistance in these steels by optimizing the alloying design, metallurgical quality and Q&T parameters. …”

Section: Introductionmentioning

confidence: 99%

“…Among these efforts, the correlations between various metallurgical factors and the susceptibility to SSC/HIC have recently received increasing attention [7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22]. Once these steels are exposed to the sour environment, atomic hydrogen (H) can form on the material surface due to the H + →H reaction [11], which depends on environmental and surface conditions.…”

Section: Introductionmentioning

confidence: 99%

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Sulfide Stress Cracking Behavior of a Martensitic Steel Controlled by Tempering Temperature

Sun

Wang

et al. 2018

Materials

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A medium-carbon Cr–Mo–V martensitic steel was thermally processed by quenching (Q) at 890 °C and tempering (T) at increasing temperatures from 650 °C to 720 °C and the effect of tempering temperature, Tt, on sulfide stress cracking (SSC) behaviors was estimated mainly via double cantilever beam (DCB) and electrochemical hydrogen permeation (EHP) tests and microstructure characterization. The results indicate that the threshold stress intensity factor for SSC, KISSC, increased with increasing Tt. The overall and local H concentration around the inclusions decreased with increasing Tt, due to reductions in the amounts of solute atoms, grain boundaries and dislocations, which effectively prevented SSC initiation. Also, increasing Tt caused an increased fraction of high-angle boundaries, which evidently lowered the SSC propagation rate by more frequently diverting the propagating direction and accordingly restricted SSC propagation. The overall SSC resistance of this Q&T–treated steel was therefore significantly enhanced.

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“…The microstructure features in the welding zone, such as the grain sizes, orientation distribution, and the grain boundary characterization distribution (GBCD), were decided by the welding processes, for example, the bonding temperature and pressures, the initial material states, and the pure Ni interlayer application [11][12][13]. All the above microstructure features can strongly influence the material properties, including the physical and chemical properties [14][15][16][17], and mechanical properties [18][19][20][21][22], which are widely studied in different based materials (BMs). However, few studies were accessible for the SSDB joints.…”

Section: Introductionmentioning

confidence: 99%

Effect of Abnormal Grains on the Mechanical Properties of FGH96 Solid-State Diffusion Bonding Joint

et al. 2022

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The hollow twin-web disk is designed to improve the thrust-to-weight ratio of the aero engine, where the welding joint microstructures determine the disk’s mechanical properties. This study aimed to elucidate the effect of abnormal grains formed in the welding region on the mechanical properties of FGH96 solid-state diffusion bonding joints. Digital image correlation using images captured by scanning electron microscopy (SEM-DIC) and electron backscattering diffraction (EBSD) technologies were applied. The results show that abnormally large grains (2.5 times that of the matrix), with preferred orientation in the bonding region, were detrimental to the joint mechanical properties. The yield and tensile strengths were 995.85 MPa and 1456.67 MPa, respectively, and the corresponding relative (ratio to the matrix) ones were 92.54% and 88.81%. After modifying the bonding process, the grain size in the bonding region was tailored to close to that of the matrix, and considerable twin boundaries (TBs) formed, leading to the relative tensile and yield strength reaching 98.86% and 99.37%. Furthermore, the failure mode changed to intragranular type from intergranular type. It demonstrates that tailoring the newborn grain size, introducing TBs inside, and eliminating preferred orientation during the welding process can be an efficient way to improve the joint mechanical properties.

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The role of microstructure and grain orientations on intergranular cracking susceptibility of UNS 17400 martensitic stainless steel

Cited by 15 publications

References 30 publications

Improvement of wear resistance in a pearlitic rail steel via quenching and partitioning processing

Improvement of wear resistance in a pearlitic rail steel via quenching and partitioning processing

Sulfide Stress Cracking Behavior of a Martensitic Steel Controlled by Tempering Temperature

Effect of Abnormal Grains on the Mechanical Properties of FGH96 Solid-State Diffusion Bonding Joint

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