Effect of heat treatment and precipitation state on toughness of heavy section Mn-Mo-Ni-steel for nuclear power plants components

Haverkamp, K.D.; Forch, Karl; Piehl, K.H.; Witte, W. G.

doi:10.1016/0029-5493(84)90008-6

Cited by 30 publications

(9 citation statements)

References 1 publication

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“…The starting condition is a tempered bainite microstructure and is the condition in which this steel is generally used in the nuclear reactor pressure vessels [4,17]. [21,22] is summarized in Table 1.…”

Section: Continuous Cooling Transformationmentioning

confidence: 99%

“…Nuclear reactor pressure vessels are usually made of low-alloy bainitic steels. One such steel is 20MnMoNi55 which after quenching and tempering consists of bainite with cementite (Fe 3 C) and M 2 C precipitates [4]. Significant research has already been documented on different metallurgical aspects (i.e., physical metallurgy, fracture) of pressure vessel steels in the published domain [5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Cooling Rate on the Microstructure of a Pressure Vessel Steel

Das

Kapoor

2019

Metallogr. Microstruct. Anal.

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The present article thoroughly explores the effect of cooling rate on various microstructural features of a reactor pressure vessel steel (20MnMoNi55). For this, dilatometric experiments were performed at different cooling rates. Optical microscopy and electron backscatter diffraction were used to measure different microstructural parameters. Continuous cooling from 0.15 to 0.3 °C/s revealed ferrite and bainite; only bainite is seen from 1 to 2 °C/s, both bainite and martensite were found in the regime 5 to 15 °C/s, and complete martensitic transformation was observed at cooling rate 20 °C/s and above. With increase in cooling rate, the fraction of low angle boundary decreased and that of high angle boundary increased. The nature of grain size distribution was found to be cooling rate sensitive.

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Section: Continuous Cooling Transformationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Cooling Rate on the Microstructure of a Pressure Vessel Steel

Das

Kapoor

2019

Metallogr. Microstruct. Anal.

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“…It is a hard and brittle phase which reduces the toughness of this steel. 51) During the tempering process, C atoms have enough capacity to diffuse out of the martensite, forming carbides. Among the alloying elements, the binding ability of Mo with C is relatively strong, with a significant Mo content in 300M steel.…”

Section: Discussion For Mechanism Of Toughness Andmentioning

confidence: 99%

Simultaneous Improvement of Toughness and Fatigue Life in a Typical Ultrahigh Strength Steel by a New Deep Cryogenic Treatment Process

et al. 2021

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“…Because of the continuous neutron irradiation that occurs during the operation of a nuclear reactor, fracture toughness deteriorates and the ductile-brittle transition temperature (DBTT) moves toward high temperatures. [4,5] Thus, in order to guarantee the safe operation of a nuclear reactor, steels that have a high fracture toughness should be used. Since large-scale nuclear reactor structures are usually fabricated by welding, it is also important to use steels with excellent welding properties.…”

Section: Introductionmentioning

confidence: 99%

Effects of alloying elements on fracture toughness in the transition temperature region of base metals and simulated heat-affected zones of Mn-Mo-Ni low-alloy steels

Kim

Lee

et al. 2004

Metall Mater Trans A

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This study is concerned with the effects of alloying elements on fracture toughness in the transition temperature region of base metals and heat-affected zones (HAZs) of Mn-Mo-Ni low-alloy steels. Three kinds of steels whose compositions were varied from the composition specification of SA 508 steel (grade 3) were fabricated by vacuum-induction melting and heat treatment, and their fracture toughness was examined using an ASTM E1921 standard test method. In the steels that have decreased C and increased Mo and Ni content, the number of fine M 2 C carbides was greatly increased and the number of coarse M 3 C carbides was decreased, thereby leading to the simultaneous improvement of tensile properties and fracture toughness. Brittle martensite-austenite (M-A) constituents were also formed in these steels during cooling, but did not deteriorate fracture toughness because they were decomposed to ferrite and fine carbides after tempering. Their simulated HAZs also had sufficient impact toughness after postweld heat treatment. These findings indicated that the reduction in C content to inhibit the formation of coarse cementite and to improve toughness and the increase in Mo and Ni to prevent the reduction in hardenability and to precipitate fine M 2 C carbides were useful ways to improve simultaneously the tensile and fracture properties of the HAZs as well as the base metals.

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Effect of heat treatment and precipitation state on toughness of heavy section Mn-Mo-Ni-steel for nuclear power plants components

Cited by 30 publications

References 1 publication

Effect of Cooling Rate on the Microstructure of a Pressure Vessel Steel

Effect of Cooling Rate on the Microstructure of a Pressure Vessel Steel

Simultaneous Improvement of Toughness and Fatigue Life in a Typical Ultrahigh Strength Steel by a New Deep Cryogenic Treatment Process

Effects of alloying elements on fracture toughness in the transition temperature region of base metals and simulated heat-affected zones of Mn-Mo-Ni low-alloy steels

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