Fracture characteristics of thermally exposed 9Cr–1Mo steel after tensile and impact testing at room temperature

Blach, J.; Falat, Ladislav; Ševc, Peter

doi:10.1016/j.engfailanal.2008.09.003

Cited by 65 publications

(20 citation statements)

References 11 publications

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“…It can also be observed that nanosized MX-type carbonitrides formed inside the martensite lath matrix. Previous work [3,[5][6][7][8]12] found that additions of tungsten and cobalt could accelerate the growth of both carbide and MX carbonitride during thermal exposure, but these results came from the conditions of long-term exposure process or creep process. In this study, it can be concluded that the size of the carbide and MX carbonitride precipitates did not increase significantly during short-term thermal exposure process.…”

Section: Effect Of Thermal Exposure On Microstructurementioning

confidence: 86%

Microstructural Evolution and Mechanical Properties of Short-Term Thermally Exposed 9/12Cr Heat-Resistant Steels

Wang

Yan

Sha

et al. 2012

Metall Mater Trans A

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The microstructural evolution during short-term (up to 3000 hours) thermal exposure of three 9/12Cr heat-resistant steels was studied, as well as the mechanical properties after exposure. The tempered martensitic lath structure, as well as the precipitation of carbide and MX type carbonitrides in the steel matrix, was stable after 3000 hours of exposure at 873 K (600°C). A microstructure observation showed that during the short-term thermal exposure process, the change of mechanical properties was caused mainly by the formation and growth of Lavesphase precipitates in the steels. On thermal exposure, with an increase of cobalt and tungsten contents, cobalt could promote the segregation of tungsten along the martensite lath to form Laves phase, and a large size and high density of Laves-phase precipitates along the grain boundaries could lead to the brittle intergranular fracture of the steels.

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Section: Effect Of Thermal Exposure On Microstructurementioning

confidence: 86%

Microstructural Evolution and Mechanical Properties of Short-Term Thermally Exposed 9/12Cr Heat-Resistant Steels

Wang

Yan

Sha

et al. 2012

Metall Mater Trans A

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show abstract

“…Also, nano-sized MX-type carbonitrides form inside the martensite lath matrix. Helis et al (2009), Kadoya et al (2002), Lee et al (2006), Abe (2004), Sawada et al (2001) and Blach et al (2009) found that additions of tungsten and cobalt could accelerate the growth of both carbide and MX carbonitride during thermal exposure, in conditions of long-term exposure process or creep process. Here, the size of the carbide and MX carbonitride precipitates do not increase significantly during the thermal exposure process.…”

Section: Effect Of Thermal Exposurementioning

confidence: 97%

Thermal Ageing of Heat-Resistant Steels

Yan

Wang

Shan

et al. 2015

9-12Cr Heat-Resistant Steels

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The microstructural evolution during short-term thermal exposure of 9/12Cr heat-resistant steels is described, as well as mechanical properties after exposure. The tempered martensitic lath structure, as well as the precipitation of carbide and MX-type carbonitrides in the steel matrix is stable. On thermal exposure, with increase of cobalt and tungsten contents, cobalt could promote the segregation of tungsten along the martensite lath to form Laves phase, and large size and high density of Laves phase precipitates along the grain boundaries could lead to the brittle intergranular fracture of the steels. In addition, the longterm thermal ageing effect on China Low Activation Martensitic (CLAM) steel is discussed. The microstructural evolution, including the growth of M 23 C 6 carbides and the formation of Laves phase precipitates as well as the evolved subgrains, leads to changes in the mechanical properties. The upper shelf energy of the thermally aged CLAM steel decreases with the extension of ageing time, while the yield strength changes slightly. After long-term thermal ageing, the MX-type precipitates remain stable. The growth of M 23 C 6 and the formation of Laves phase are confirmed. The Laves phase was the main factor leading to the increase in the ductile-brittle transition temperature. Microstructure Heat Treatment, Martensitic Lath and SubgrainStructure, M 23 C 6A normalising treatment can give the desired martensitic microstructure for the China Low Activation Martensitic (CLAM) steel (Table 6.1) and provide good solubilisation for carbide into the matrix with a homogeneous microstructure. The treatment of air cooling from 980 °C leads to martensitic transformation with lath sections between 0.14 μm and 0.42 μm. The subsequent tempering softens the steel and promotes the formation of M 23 C 6 and fine MX precipitates. Dislocations

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“…Chromium molybdenum creep-resistant steels are usually employed in ultrasupercritical (USC) power plants for headers and superheater tubes and components in nuclear reactors [1][2].The welding of these steels by high productivity processes, such as flux cored arc welding (FCAW) and gas metal arc welding (GMAW) with metal cored wire, is a challenge nowadays [3][4].…”

Section: Introductionmentioning

confidence: 99%

Study of cracks in the weld metal joint of p91 steel of a superheater steam pipe

Tavares

Pardal

Souza

et al. 2015

Engineering Failure Analysis

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Fracture characteristics of thermally exposed 9Cr–1Mo steel after tensile and impact testing at room temperature

Cited by 65 publications

References 11 publications

Microstructural Evolution and Mechanical Properties of Short-Term Thermally Exposed 9/12Cr Heat-Resistant Steels

Microstructural Evolution and Mechanical Properties of Short-Term Thermally Exposed 9/12Cr Heat-Resistant Steels

Thermal Ageing of Heat-Resistant Steels

Study of cracks in the weld metal joint of p91 steel of a superheater steam pipe

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