The effect of cerium on high temperature tensile and creep behavior of a superalloy

Cosandey, F.; Li, D.; Sczerzenie, Frank; Tien, J. K.

doi:10.1007/bf02643777

Cited by 48 publications

(18 citation statements)

References 25 publications

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“…There have been a number of researches pertaining to the application of REM elements in molten steel. Substantial improvements have been achieved in mechanical properties due to the modifications of the morphology and size of inclusions [16][17][18][19][20][21][22][23][24][25][26]. However, the purity of steel can be declined and some important properties deteriorated when the REM addition technology is improperly used, such as the unreasonable amounts of REM addition, which will eventually affect the application of REM in the steel.…”

Section: Introductionmentioning

confidence: 99%

Effects of Rare Earth on the Microstructure and Impact Toughness of H13 Steel

Gao

Liu

et al. 2015

Metals

105

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Studies of H13 steel suggest that under appropriate conditions, additions of rare-earth metals (REM) can significantly enhance mechanical properties, such as impact toughness. This improvement is apparently due to the formation of finer and more dispersive RE inclusions and grain refinement after REM additions. In this present work, the microstructure evolution and mechanical properties of H13 steel with rare earth additions (0, 0.015, 0.025 and 0.1 wt.%) were investigated. The grain size, inclusions and fracture morphology were systematically studied by means of optical microscopy (OM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results indicate that REM addition of 0.015 wt.% can result in good improvement of performance compared to the REM additions of 0.025 wt.% and 0.1 wt.%. It is found that the impact toughness is significantly enhanced with the addition of 0.015% REM, which can be improved 90% from 10 J to 19 J. Such an addition of REM can result in a huge volume fraction of finer and more dispersive inclusions which are extremely good to toughness.

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Section: Introductionmentioning

confidence: 99%

Effects of Rare Earth on the Microstructure and Impact Toughness of H13 Steel

Gao

Liu

et al. 2015

Metals

105

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“…In the steels D, E and F, low amount of Ce was added with the intention of removing bulk free S. The amounts of residual Ce in the steels after desulfurization were suppressed less than 0.01 mass%, since more than 0.01 mass% of Ce causes severe brittleness and hot shortness. 6) In the steel G, the addition of B increased from usual amount of 0.01 mass% to comparatively higher level of 0.074 mass% with the intention of accelerating BN precipitation. In the steel H, 0.33 mass% of Ti was added to the chemical constituent of the steel G with the intention of removing free S more thoroughly.…”

Section: Methodsmentioning

confidence: 99%

“…Chemical compositions of type 304 austenitic stainless steels were modified with additions of B and N with a view of precipitating BN, and also modified with additions of Ce 5,6) and Ti [7][8][9][10] for removing free S which segregates easily onto creep cavity surface, then obstructing BN precipitation onto creep cavity surfaces. Chemical compositions of 8 steels used in the present work are shown in Table 1.…”

Section: Methodsmentioning

confidence: 99%

Effect of Boron Nitride Precipitation at Cavity Surface on Rupture Properties

Shinya

Kyono

2006

Mater. Trans.

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Compositions of type 304 austenitic stainless steels were modified with additions of boron, cerium and titanium. The additions of cerium and titanium removed free sulfur almost completely by formation of sulfides (Ce 2 O 2 S 2 and Ti 4 C 2 S 2 ), and led to precipitation of boron nitride onto creep cavity surfaces during creep exposure. Chemistries of the creep cavity surfaces, exposed by breaking creep exposed specimens at liquid nitrogen temperature under impact loading, were examined by Auger electron spectroscopy. The Auger spectra revealed the presence of boron nitride precipitating onto creep cavity surfaces. It was indicated that the boron nitride suppressed creep cavity growth and provided the steel with higher rupture strength and higher rupture ductility.

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“…One such modification that has proved very successful is adding rare earth metals (REMs) to steel/cast steel for lowering oxygen and sulphur contents [12,13] and changing the microstructure and morphology of non-metallic inclusions [13][14][15][16][17]. Adding rare earth metals to steel improves its properties [18][19][20][21][22][23][24][25][26][27]. Most commonly, Ce is used alone or in combination with other elements.…”

Section: Introductionmentioning

confidence: 99%

“…The production of steel and cast steel containing REMs is difficult and successful modification depends on a number of factors, including adequate deoxidation of the molten metal, the REMs' amount, type and the time the addition is made. Nevertheless, rare earth metals bring a number of benefits in steelmaking by influencing the steel microstructure (grain refinement, non-metallic inclusion modification) and by increasing the strength and corrosion properties and hardness of the steel [25][26][27][28][29][30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Fracture Energy and Fracture Morphology after Three-Point Bending Test of Welded Joints Made of Cast Steel Designed for Use in Power Sector, with and without the Addition of Rare Earth Metals

Kasińska

Skrzypczyk

2018

Metals

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Abstract:The paper reports the three-point bending test results of welded joints. The joints were made of chromium-molybdenum cast steel designed for the use at elevated temperatures. TIG (tungsten inert gas) welding technique was used. The fracture energy for particular joint zones and the stretch zone width (SZW) under the notch bottom were determined in a qualitative fracture toughness assessment. Fracture surface morphology was analyzed. The stretch zone measurement indicated a qualitative relationship between its width and the values of fracture energy. The results confirmed the influence of the modification on the character of fracture and the portions of brittle and ductile fracture in particular areas of welded joints.

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The effect of cerium on high temperature tensile and creep behavior of a superalloy

Cited by 48 publications

References 25 publications

Effects of Rare Earth on the Microstructure and Impact Toughness of H13 Steel

Effects of Rare Earth on the Microstructure and Impact Toughness of H13 Steel

Effect of Boron Nitride Precipitation at Cavity Surface on Rupture Properties

Fracture Energy and Fracture Morphology after Three-Point Bending Test of Welded Joints Made of Cast Steel Designed for Use in Power Sector, with and without the Addition of Rare Earth Metals

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