On Laves phase in a 9Cr3W3CoB martensitic heat resistant steel when aged at high temperatures

2021 ◽  
Vol 85 ◽  
pp. 129-140
Author(s):  
Ye Liang ◽  
Wei Yan ◽  
Xianbo Shi ◽  
Yanfen Li ◽  
Quanqiang Shi ◽  
...  
Keyword(s):  
High Temperatures ◽  
Laves Phase ◽  
Resistant Steel ◽  
Heat Resistant Steel ◽  
Heat Resistant

Novel Concept of Creep Strengthening Mechanism using Grain Boundary Fe2Nb Laves Phase in Austenitic Heat Resistant Steel

2011 ◽  
Vol 1295 ◽  
Author(s):  
Imanuel Tarigan ◽  
Keiichi Kurata ◽  
Naoki Takata ◽  
Takashi Matsuo ◽  
Masao Takeyama
Keyword(s):  
Grain Boundary ◽  
Strengthening Mechanism ◽  
Local Deformation ◽  
Creep Rupture ◽  
Laves Phase ◽  
Resistant Steel ◽  
Heat Resistant Steel ◽  
Heat Resistant ◽  
Term Creep

ABSTRACTThe creep behavior of a new type of austenitic heat-resistant steel Fe-20Cr-30Ni-2Nb (at.%), strengthened by intermetallic Fe2Nb Laves phase, has been examined. Particular attention has been given to the role of grain boundary Laves phase in the strengthening mechanism during long-term creep. The creep resistance increases with increasing area fraction (ρ) of grain boundary Laves phase according to equation ε/ε = (1−ρ), where ε0 is the creep rate at ρ = 0. In addition, the creep rupture life is also extended with increasing ρ without ductility loss, which can yield up to 77% of elongation even at ρ = 89%. Microstructure analysis revealed local deformation and well-developed subgrains formation near the grain boundary free from precipitates, while dislocation pile-ups were observed near the grain boundary Laves phase. Thus, the grain boundary Laves phase is effective in suppressing the local deformation by preventing dislocation motion, and thereby increases the long-term creep rupture strength. This novel creep strengthening mechanism was proposed as “grain boundary precipitation strengthening mechanism” (GBPS).

Growth Kinetics of Laves Phase and Its Effect on Creep Rupture Behavior in 9Cr Heat Resistant Steel

2016 ◽  
Vol 23 (7) ◽  
pp. 685-691 ◽  
Author(s):  
Zhi-xin Xia ◽  
Chuan-yang Wang ◽  
Chen Lei ◽  
Yun-ting Lai ◽  
Yan-fen Zhao ◽  
...  
Keyword(s):  
Growth Kinetics ◽  
Creep Rupture ◽  
Laves Phase ◽  
Resistant Steel ◽  
Heat Resistant Steel ◽  
Heat Resistant ◽  
Kinetics Of ◽  
Rupture Behavior

Co Addition Effect on the Precipitation Behavior of Laves Phase in Fe-10Cr Ferritic Alloy

2007 ◽  
Vol 561-565 ◽  
pp. 1745-1748
Author(s):  
Ick Soo Kim ◽  
S.M. Lee ◽  
Joo Yong Kim ◽  
Yoshimi Watanabe ◽  
Hisashi Sato ◽  
...  
Keyword(s):  
Power Plants ◽  
Nuclear Reactor ◽  
Laves Phase ◽  
Resistant Steel ◽  
Laves Phases ◽  
Ferritic Alloy ◽  
Heat Resistant Steel ◽  
Heat Resistant ◽  
Co Addition ◽  
Aging Stage

Ferritic heat-resistant steel comprises basic alloys of Fe-10mass%Cr-W. This study investigates how stress, the addition of Co, and tempering before aging affect the precipitation of the Laves phase of Fe-10Cr-6W ferritic heat-resistant steel, which is used in ultra-supercritical power plants and nuclear reactor materials. The study also investigates the mechanical properties of the steel. Precipitation of the Laves phase by aging increases the tensile strength, but decreases the elongation and impact strength of the alloys. Toughness of the alloys decreases greatly as very fine disk-like Laves phases appear in early aging stage. The strength and impact value of the steel decrease when the steel is tempered before aging. This is mainly due to decrease of density and increase of the particle size in the Laves phase. Since precipitation of the Laves phase increases by addition of Co; the strength increases and the elongation and impact value decrease.

scholarly journals Effect of Grain Boundary Fe2Nb Laves Phase on Creep of Austenitic Heat Resistant Steel of Fe-20Cr-30Ni-2Nb in Steam Atmosphere

2014 ◽  
Vol 100 (9) ◽  
pp. 1158-1164 ◽  
Author(s):  
Yu Misosaku ◽  
Imanuel Tarigan ◽  
Takahiro Kimura ◽  
Naoki Takata ◽  
Mitsutoshi Ueda ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Laves Phase ◽  
Resistant Steel ◽  
Heat Resistant Steel ◽  
Heat Resistant

Deformation behaviour and material properties of austenitic heat-resistant steel X15CrNiSi25-20 subjected to high temperatures and creep

2015 ◽  
Vol 69 ◽  
pp. 219-229 ◽  
Author(s):  
Josip Brnic ◽  
Goran Turkalj ◽  
Marko Canadija ◽  
Sanjin Krscanski ◽  
Marino Brcic ◽  
...  
Keyword(s):  
High Temperatures ◽  
Material Properties ◽  
Deformation Behaviour ◽  
Resistant Steel ◽  
Heat Resistant Steel ◽  
Heat Resistant

Study on Laves phase in an advanced heat-resistant steel

2009 ◽  
Vol 3 (4) ◽  
pp. 434-441 ◽  
Author(s):  
Ping Hu ◽  
Wei Yan ◽  
Wei Sha ◽  
Wei Wang ◽  
Zhan-li Guo ◽  
...  
Keyword(s):  
Laves Phase ◽  
Resistant Steel ◽  
Heat Resistant Steel ◽  
Heat Resistant

Mo-rich Laves phase in a 9.5Cr-1.5MoCoVNbNB heat-resistant steel during long-term aging at 620 °C

2021 ◽  
pp. 111588
Author(s):  
Hui-fang Yin ◽  
Gang Yang ◽  
Ji-qing Zhao ◽  
Han-sheng Bao
Keyword(s):  
Laves Phase ◽  
Resistant Steel ◽  
Heat Resistant Steel ◽  
Heat Resistant

Nickel Aluminides as a “Filler” for Joining Ceramics and Metals

2006 ◽  
Vol 45 ◽  
pp. 1608-1613
Author(s):  
D. Kalinski ◽  
M. Chmielewski ◽  
A. Krajewski ◽  
M. Kozłowski
Keyword(s):  
Intermetallic Compounds ◽  
High Temperatures ◽  
Argon Atmosphere ◽  
Nickel Aluminides ◽  
Resistant Steel ◽  
Reactive Sintering ◽  
Heat Resistant Steel ◽  
Temperature Range ◽  
Heat Resistant ◽  
Steel Joints

Reactive sintering of liquid Al with solid Ni resulting in the formation of intermetallic compounds was used for joining parts made of heat-resistant steel and parts made of ZrO2 ceramic. The constituents of the binding layer (the ‘filler’) were introduced in the form of foils (e.g. in the Al/Ni/Al sequence) in-between the two parts to be joined. The heat-resistant steel joints (steel- /NiAl/-steel) were bonded in vacuum within the temperature range from 1023K to 1323K, at a pressure of 6MPa for 30 to 60min. The ceramic joints of the ZrO2-/NiAl/-ZrO2 type were produced in an argon atmosphere within the temperature range from 1373K to 1723K at a pressure of 6MPa for a time from 30 to 60min. The joints of both types produced under these conditions had a required structure and were suitable for exploitation at high temperatures in air. Based on the results obtained for these joints, we experimented successfully with joining zirconium ceramics with heatresistant steel by using the reactive sintering of Ni-Al intermetallic compounds.

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