Ar ion irradiation hardening of high-Cr ferritic/martensitic steels at 700 °C

Shen, Yinzhong; Zhu, Jun; Huang, Xi

doi:10.1007/s12540-016-5524-9

Cited by 4 publications

(3 citation statements)

References 21 publications

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“…Furthermore, it can be used to gain information about the penetration depth of the ions into the surface of materials [18]. In this paper, SRIM/TRIM were used to explore the irradiation effect on P91 and P92 steels [19]. Moreover, these programmes were also useful in discovering the penetration depth of proton beams on P91 and P92, by finding the penetration depth of protons.…”

Section: Resultsmentioning

confidence: 99%

Investigation of Long and Short Term Irradiation Hardening of P91 and P92 Ferritic/Martensitic Steels

Hiwa¹,

Ari²

2019

PAST-TF

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The aim of the study was to determine the effect of proton irradiation at room temperature on ferritic/martensitic P91 and P92 steels, in particular on their hardness. In addition, SRIM programme was used to identify the proton penetration depth. The study has found that the hardness of the unirradiated P92 steel is higher than that of unirradiated P91 steel, since P92 steel contains tungsten, which produces higher level of solid solution hardening. P91 and P92 steel samples were irradiated using 1.9-MeV protons to the fluence of 1.3510 17 ion/cm 2 . It was found that Vickers hardness test values increased for both P91 and P92 steels at 0.2 kg loads. For high proton irradiation (long irradiation period) the fluence was 1.10110 18 ion/cm 2 (about ten times higher than at the low proton irradiation). With growth of irradiation fluence, the number of displacements per atom (dpa) went up from 0.043 dpa (for low irradiation) to 0.18 dpa (for high irradiation) and the hardness of steels that were under investigation increased. P91 and P92 steel samples after long irradiation were heat treated for one hour at 700 o C in a vacuum furnace. The study identified that while the chemical composition of P91 and P92 steel were almost identical, irradiated P92 steel requires twice the heat treatment to reduce its hardness to a basic value, as compared with P91 steel samples.Целью данного исследования было определение влияния облучения протонами при комнатной температуре на ферритномартенситные стали Р91 и Р92, в частности, на их твёрдость. Кроме того, для изучения глубины внедрения протонов в стали была использована вычислительная программа SRIM. Обнаружено, что необлучённая сталь Р92 твёрже, чем необлучённая сталь Р91. Сталь Р92 содержит вольфрам, который способствует упрочнению твёрдых растворов. Образцы сталей Р91 и Р92 были кратковременно облучены протонами энергией 1,9 МэВ до флюенса 1,35·10 17 ион/см 2 . Под нагрузкой 200 г их твёрдость по Виккерсу увеличилась. Затем аналогичные образцы были подвергнуты приблизительно в 10 раз более длительному облучению до флюенса 1,101·10 18 ион/см 2 . С увеличением продолжительности облучения увеличилось число смещений на атом с 0,043 до 0,18 млн -1 и увеличилась твёрдость образцов. После более длительного облучения образцы исследуемых сталей были подвергнуты термообработке -помещены на один час в вакуумную печь при температуре 700 ºС. Исследование показало, что, хотя химический состав исследованных сталей почти идентичен, термообработка облучённой стали Р92 для снижения её твёрдости до исходного уровня требует вдвое большего времени, чем термообработка образцов стали Р91.Ключевые слова: программа SRIM, сканирующий электронный микроскоп, смещение на атом, сталь Р91, сталь Р92.

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Section: Resultsmentioning

confidence: 99%

Investigation of Long and Short Term Irradiation Hardening of P91 and P92 Ferritic/Martensitic Steels

Hiwa¹,

Ari²

2019

PAST-TF

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“…These results indicated that the size of dislocation loops increased, on the contrary, the density of dislocation loops decreased with the increase of irradiation temperature from 200 to 700 • C. In addition, fine bubbles were observed to homogeneously distribute in the sample irradiated at 700 • C, as showed in Figure 4e. These bubbles have an average diameter of about 3 nm and a very high number density of about 1.87 × 10 25 m −3 [36].…”

Section: Discussionmentioning

confidence: 99%

Evaluation of Irradiation Hardening of P92 Steel under Ar Ion Irradiation

Liu

Shen

Zhu³

et al. 2018

Metals

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P92 steel was irradiated with Ar ion up to 10 dpa at 200, 400, and 700 • C. The effect of Ar ion irradiation on hardness was investigated with nanoindentation tests and microstructure analyses. It was observed that irradiation-induced hardening occurred in the steel after Ar ion irradiation at all three temperatures to 10 dpa. The steel exhibited significant hardening at 200 and 700 • C, and slight hardening at 400 • C under Ar ion irradiation. Difference in the magnitude of irradiation-induced hardening at different temperature in the steel is attributed to different changes in the microstructure of the steel that arose from the irradiation. Irradiation-induced hardening in the P92 steel irradiated at 200 • C is attributed to the occurrence of both dislocation loops and other fine irradiation defects during irradiation. Slight hardening in the steel irradiated at 400 • C mainly arises from the annihilation of defect clusters at this temperature. The occurrence of fine Ar bubbles with high number density during the Ar ion irradiation at 700 • C resulted in the significant hardening in the steel.

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“…But above 19 ppm, the S A value was drastically reduced to 150 N mm −2 . Notably, the mechanical properties of steel are greatly determined by the size, the morphology and distribution of the inclusions and the alloying elements as hardening phases in steel [16]. Except for the alloying elements, the mechanical properties are mainly determined by the inclusions.…”

Section: Effect Of Mg Content On Inclusion Size and Distributionmentioning

confidence: 99%

Exploration of morphology evolution of the inclusions in Mg-treated 16MnCrS5 steel

Xie

Zhang

Yang

et al. 2018

Ironmaking & Steelmaking

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To elucidate the morphology evolution of the inclusions in 16MnCrS5 steel with various masses of Mg addition, the experiments and thermodynamics were carried out with a high-temperature tube electric resistance furnace and FactSage software, respectively. The evolutions of the inclusions after the smelting and hot-processing were described. The experimental results show that with Mg addition of 35-42 ppm, many spindle and spherical inclusions with the size below 20 μm appeared, whereas the long-strip inclusions above 20 μm disappeared; after hot-processing, particularly, the h value was above 50%, beneficial to obtaining more spindle inclusions, and most spherical inclusions at 35 ppm were also obtained. The thermodynamics show that with Mg mass between 0.349 and 6.076 ppm, Al 2 O 3 was easily converted to MgO•Al 2 O 3 , whereas above 6.076 ppm, Mg was directly converted to form MgO; above more, MgS coexisted with MgO.

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Ar ion irradiation hardening of high-Cr ferritic/martensitic steels at 700 °C

Cited by 4 publications

References 21 publications

Investigation of Long and Short Term Irradiation Hardening of P91 and P92 Ferritic/Martensitic Steels

Investigation of Long and Short Term Irradiation Hardening of P91 and P92 Ferritic/Martensitic Steels

Evaluation of Irradiation Hardening of P92 Steel under Ar Ion Irradiation

Exploration of morphology evolution of the inclusions in Mg-treated 16MnCrS5 steel

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