Importance of austenitization temperature and ausforming on creep strength in 9Cr ferritic/martensitic steel

Vivas, Javier; Capdevila, Carlos; Altstadt, E.; Houška, M.; San-Martín, David

doi:10.1016/j.scriptamat.2018.04.038

Cited by 37 publications

(21 citation statements)

References 35 publications

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“…The conventional treatments (AR) and TMT considered in this work were carried out on 10 mm in length and 5 mm in diameter cylindrical samples using a DIL 805A/D plastodilatometer (TA instruments) as described elsewhere [39,40]. Due to the limited amount of material available after the TMT is carried out in the plastodilatometer, the creep properties were investigated by means of the small punch creep test (SPCT) performed at 700°C as it has been previously reported [41,42].…”

Section: Creep Testsmentioning

confidence: 99%

“…If deformation temperature is above the non-recrystallization temperature, the freshly formed austenite microstructure will present a significantly reduced grain size that would induce the concomitant martensitic microstructural refinement. Similarly, by applying plastic deformation to the austenite at temperatures below the nonrecrystallization temperature, which is the so-called ausforming processing [57], Thermomechanical treatments investigated in this study [40].…”

Section: Effect Of Austenitization Temperaturementioning

confidence: 99%

“…The dislocation density after HAT and TMT was measured by XRD [40]. The results show a dislocation density of (14 ± 0.1) × 10 14 m −2 and (28 ± 0.1) × 10 14 m −2 after austenitization and ausforming, respectively.…”

Section: Effect Of Austenitization Temperaturementioning

confidence: 99%

“…Martensite matrix, M 23 C 6 precipitate, and MX-nanoprecipitate distributions after the different thermomechanical and heat[40].…”

mentioning

confidence: 99%

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High-Chromium (9-12Cr) Steels: Creep Enhancement by Conventional Thermomechanical Treatments

Vivas¹,

San-Martín²,

Caballero³

et al. 2021

Welding - Modern Topics

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There is a worldwide need to develop materials for advanced power plants with steam temperatures of 700°C and above which have the capacity to achieve high efficiency and low CO 2 emissions. This request involves the development of new grades of 9-12Cr heat-resistant steels, with a nanostructured martensite, mainly focusing on the long-term creep rupture strength of base metal and welded joints, creep-fatigue properties, and microstructure evolution during exposure at such elevated temperatures. The main shortcomings of actual 9-12Cr high-chromium steels are that the creep resistance is not enough to fulfill the engineering requirements at temperatures higher than 600°C and the material undergoes a cyclic softening. Creep strength at high temperature could be improved by a microstructural optimization through nano-precipitation, guided by computational thermodynamics, and thermomechanical control process optimization.

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Section: Creep Testsmentioning

confidence: 99%

Section: Effect Of Austenitization Temperaturementioning

confidence: 99%

Section: Effect Of Austenitization Temperaturementioning

confidence: 99%

“…Martensite matrix, M 23 C 6 precipitate, and MX-nanoprecipitate distributions after the different thermomechanical and heat[40].…”

mentioning

confidence: 99%

See 2 more Smart Citations

High-Chromium (9-12Cr) Steels: Creep Enhancement by Conventional Thermomechanical Treatments

Vivas¹,

San-Martín²,

Caballero³

et al. 2021

Welding - Modern Topics

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“…The small punch (SP) test has long been accepted as a method to estimate mechanical properties from small quantities of materials. In particular the ductile to brittle transition temperature, the yield stress, the ultimate tensile stress and creep strength can be extracted for homogeneous and isotropic metals [11][12][13][14][15][16][17][18][19]. The SP test is not intended to replace conventional tests such as tensile tests, Charpy impact tests or fracture mechanical testing, but to be used as screening procedure [17].…”

Section: Introductionmentioning

confidence: 99%

Effect of anisotropic microstructure of ODS steels on small punch test results

Altstadt

Houška

Das

2018

Ubiquity Proceedings

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How to cite:Altstadt, E., Houska, M. & Das, A. 2018. Effect of anisotropic microstructure of ODS steels on small punch test results. Ubiquity Proceedings, 1(S1): 4Abstract: Oxide dispersed strengthened (ODS) steels can exhibit a strongly anisotropic microstructure leading to anisotropic mechanical properties. The ductile to brittle transition temperature in the small punch (SP) test is therefore dependent on the specimen orientation. Three ODS steels with 13-14 mass percent Cr, manufactured through hot extrusion and hot rolling respectively, were investigated by means of SPT in different orientations. Existing microstructural data (EBSD) are used to discuss the anisotropic fracture behavior observed in the SPT. In addition, the SPT results are compared with those from existing fracture mechanics tests based on sub-sized C(T) samples. The applicability of the empirical conversion of SPT based transition temperatures into Charpy transition temperatureswell established for isotropic homogeneous metalsis investigated for materials with anisotropic microstructure.

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