Effects of N and Cu on the precipitation and the creep life of 316L austenitic stainless steel at 650°C

Cai, Bo; Kang, Jee-Hyun; Hong, Chang-Wan; Kim, Sung-Joon

doi:10.1016/j.msea.2016.03.054

Cited by 17 publications

(3 citation statements)

References 16 publications

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“…Baja austenitik AISI 316L adalah salah satu kandidat material yang sangat cocok digunakan untuk komponenkomponen yang beroperasi pada lingkungan kerja yang ekstrim, khususnya yang bersifat korosif dan temperature yang cukup tinggi seperti pada pembangkit listrik tenaga gas dan uap (PLTGU) dan pembangkit listrik tenaga nuklir (PLTN) [1][2]. Dengan komposisi kimia terbesar diantaranya adalah Chromium (Cr), Molybdenum (Mo), dan Nickel (Ni), serta komposisi Carbon (C) yang rendah (<0.03 C wt-%), menjadikan AISI 316L memiliki beberapa sifat mekanis yang unggul, diantaranya tahan pada lingkungan korosif dan suhu tinggi, sifat mampu bentuk dan las yang baik, serta tidak dapat dimagnetkan [3][4][5][6].…”

Section: Pendahuluanunclassified

Prediksi Laju Perambatan Retak Melar pada Baja Austenitik 316L Menggunakan Data Uji Melar dan Metode NSW

Ekaputra

2019

JRM

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In this study, an experimental creep crack growth rate (CCGR) of austenitic steel AISI 316L was predicted from the creep constant values and Nibkin Smith Webster (NSW) method. The experimental CCGR data were obtained from the CCG test under four different load conditions ranging from 6000 to 7000 N at 525 o C. The creep constants, A and n were obtained from the uniaxial creep rupture test under various load conditions, ranging from 180 to 225 Mpa at 525 o C. The creep constants were determined both from the minimum and average creep strain rate data. By applying the creep constants and NSW method, the predicted CCGR curve was generated and compared with the experimental CCGR curve. The result showed that the predicted CCGR curve based on the minimum creep strain rate data was found to be close to the experimental CCGR curve. The significant portion of creep crack growth's lifetime of austenitic steel AISI 316L was occupied by the crack propagation (steady stage) period rather than crack initiation and/or fracture periods. In addition, plane stress and strain conditions could also be determined from the predicted CCGR curve. It was observed that the experimental CCGR curve was located near the plane strain condition where no deformation occurred in the lateral direction.

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Section: Pendahuluanunclassified

Prediksi Laju Perambatan Retak Melar pada Baja Austenitik 316L Menggunakan Data Uji Melar dan Metode NSW

Ekaputra

2019

JRM

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“…Small addition of Nb could promote fine and stable Z-phase precipitation in 316LN steel, which remarkably reduced the minimum creep rate and prolonged the primary and secondary stages during creep at 650 °C/100 MPa [10,11]. Additionally, dispersive nanosize Cu-rich particles arose from Cu addition in 316LN and 347 austenitic steels significantly increased the creep resistance under low stress by considerable precipitation strengthening effect because of the coherency strain and partial stacking-fault strengthening [12,13]. Recently, it was concerned that rare earth (RE) elements could improve creep performance by changing the precipitation behaviors [14,15].…”

Section: Introductionmentioning

confidence: 99%

Enhancement Mechanism of Cerium in 316LN Austenitic Stainless Steel During Creep at 700 °C

Yang

Cai

Zheng

et al. 2022

Acta Metall. Sin. (Engl. Lett.)

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Effect of cerium (Ce) on creep strength and microstructure of 316LN austenitic stainless steel (316LN steel) at 700 °C/150 MPa was investigated by scanning electron microscopy (SEM), scanning transmission electron microscopy (STEM) and thermodynamic calculations. Addition of 0.032 wt% Ce to 316LN steel results in a prominent increase in creep life from 313 to 556 h. Ce enriches in titanium nitride nanoparticles, increases slightly the activity and diffusion coefficient of Mo, and facilitates the formation of fine and dense intragranular Laves phase precipitates. Thus the creep strength is remarkably enhanced by Ce addition in 316LN steel through the intragranular Laves phase precipitation strengthening. It reveals a new insight into the improvement effect of rare earth (RE) elements such as Ce on creep strength of austenitic stainless steels, which inspired the design of RE-microalloying heat-resistant steels.

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“…[18] Moreover, the increase in N content not only enhances the solid-solution strengthening of the matrix but also suppresses the coarsening of M 23 C 6 precipitates. [19] Ha and Jung [20] reported that the replacement of C by N in the carbonitrides results in nitrogenrich or pure nitride precipitates which are much more stable than the carbides during creep deformation at high temperatures. Thus, SP2215 has been developed successfully based on the multiphase strengthening mechanism.…”

Section: Introductionmentioning

confidence: 99%

Multiphase Strengthening of Nanosized Precipitates in a Cost‐Effective Austenitic Heat‐Resistant Steel

Zhang

Wang

et al. 2020

steel research int.

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A newly developed austenitic heat‐resistant steel Fe–22Cr–15Ni (SP2215) is aged at 700 °C for different times, which presents good mechanical properties. The stress rupture strength can be maintained at 78 MPa by extrapolating to 105 h at 700 °C. Transmission electron microscopy (TEM) analysis reveals the multiphase composites strengthening mechanism. Three types of precipitates, the coherent Cu‐rich particles, Nb‐rich carbonitrides and NbCrN phase, are found in the austenitic matrix. The fine Cu‐rich particles are the first to precipitate, most densely and homogeneously distributed, as is illustrated by atom probe tomography (APT). It is concluded that it is the multiphase nanoprecipitate strengthening and the high thermal stability of the precipitates that render the excellent mechanical properties at high temperature. With the significant advantages of high strength at 700 °C and cost‐effective, the novel austenitic heat‐resistant steel SP2215 is recommended to be a promising material for high‐efficiency superheaters/reheaters of ultra‐supercritical unit boiler at steam temperature from 620 to 650 °C.

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Effects of N and Cu on the precipitation and the creep life of 316L austenitic stainless steel at 650°C

Cited by 17 publications

References 16 publications

Prediksi Laju Perambatan Retak Melar pada Baja Austenitik 316L Menggunakan Data Uji Melar dan Metode NSW

Prediksi Laju Perambatan Retak Melar pada Baja Austenitik 316L Menggunakan Data Uji Melar dan Metode NSW

Enhancement Mechanism of Cerium in 316LN Austenitic Stainless Steel During Creep at 700 °C

Multiphase Strengthening of Nanosized Precipitates in a Cost‐Effective Austenitic Heat‐Resistant Steel

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