Chemical segregation behavior under thermal aging of the low-activation F82H-modified steel

Lapeña, J.; Garcı́a-Mazarı́o, M; Fernández, P.; Lancha, A.M.

doi:10.1016/s0022-3115(00)00276-2

Cited by 25 publications

(13 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Similar result of decrease in toughness for the F82H-modified steel is reported (Lapeña et al 2000), which is closely related to the precipitation of Laves phase.…”

Section: Laves Phase Precipitation Behaviour and Its Effects On Toughsupporting

confidence: 84%

Thermal Ageing of Heat-Resistant Steels

Yan

Wang

Shan

et al. 2015

9-12Cr Heat-Resistant Steels

View full text Add to dashboard Cite

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

show abstract

“…Similar result of decrease in toughness for the F82H-modified steel is reported (Lapeña et al 2000), which is closely related to the precipitation of Laves phase.…”

Section: Laves Phase Precipitation Behaviour and Its Effects On Toughsupporting

confidence: 84%

Thermal Ageing of Heat-Resistant Steels

Yan

Wang

Shan

et al. 2015

9-12Cr Heat-Resistant Steels

View full text Add to dashboard Cite

show abstract

“…Chromium enrichment and iron depletion have been reported in martensitic steels in the annealed and tempered condition [11][12][13]. This chromium enrichment was attributed to segregation in some cases [11] and to the presence of chromium carbides in other studies [12].…”

Section: Microchemistry At Grain Boundariesmentioning

confidence: 93%

Grain boundary microchemistry and metallurgical characterization of Eurofer'97 after simulated service conditions

Fernández

Garcı́a-Mazarı́o

Lancha

et al. 2004

Journal of Nuclear Materials

Self Cite

View full text Add to dashboard Cite

“…At 550°C for materials with W P 2%, the precipitation of Laves phase and the segregation of W at grain boundary occur [8,9]. The tungsten content of CLAM is 1.5%, which decreases the amount of Laves phase precipitation in weld metal and heat-affected zone at 550°C.…”

Section: Composition Structure and Tensile Propertiesmentioning

confidence: 98%

“…The composition of CLAM steel has been designed to improve the performance, such as changing tungsten content to 1.5% to decrease the amount of Laves phase precipitation in weld metal and heat-affected zone at 550°C [8,9]. Tantalum content was increased to 0.15% to have a smaller prior-austenite grain size and small spherical Tarich precipitate (TaC) to increase strength, as well as to increase the creep strength [10][11][12].…”

Section: Composition Structure and Tensile Propertiesmentioning

confidence: 99%