Effect of Tempering on Microstructure and Mechanical Properties of Boron Containing 10%Cr Steel
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In this paper, the effect of heat treatment on the microstructure and the mechanical properties of a 10%Cr steel with 0.008% boron was examined after tempering under different conditions.Abstract:
The effect of heat treatment on the microstructure and the mechanical properties of a 10%Cr steel with 0.008% boron was examined. The microstructure and the mechanical properties of this steel subjected to the normalizing were studied after tempering under different conditions. The layers of retained austenite are located along the lath boundaries. The formation of M23(B·C)6 phase having film-like shape takes place on interface boundaries of retained austenite/martensite during tempering at 525°C. As a result, the steel exhibits brittle fracture with a low value of Charpy V-notch impact toughness of 6 J/cm2. Particles of the M23(B·C)6 phase are highly resistant against the spheroidizing. The tempering at 770°C only leads to the coagulation of these particles; when the fraction of M23(B·C)6 phase significantly decreases while the fraction of M23C6 carbides increases. The tempered at 770°C steel exhibits a high value of Charpy V-notch impact toughness of 260 J/cm2. The effect of boron additives on the phase composition and the brittleness of high-chromium steels is discussed.read more
Citations
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References
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Journal ArticleDOI
Crystallographic features of lath martensite in low-carbon steel
TL;DR: In this article, electron backscattering diffraction with field-emission scanning electron microscopy was used to analyze crystallographically the lath martensite structure in a 0.20% carbon steel.
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On the contribution of carbides and micrograin boundaries to the creep strength of tempered martensite ferritic steels
TL;DR: In this paper, the authors compared the creep behaviour and the microstructural stability of a tempered martensite ferritic steel (German grade: X20) with that of a strongly deformed binary Fe10Cr alloy.
Journal ArticleDOI
Continuous dynamic recrystallization in an Al–Li–Mg–Sc alloy during equal-channel angular extrusion
TL;DR: In this article, an Al-Li-Mg-Sc alloy with an initial grain size of ∼60μm was processed by equal-channel angular extrusion (ECAE) at 300°C up to a total strain of 12.
Journal ArticleDOI
Improved Utilization of Added B in 9Cr Heat-Resistant Steels Containing W
TL;DR: In this article, the effect of improved heat treatment on creep strength and distribution of B in precipitates is investigated to effectively utilize and decrease added B. The authors have revealed in the previous report that the addition of 139ppm B significantly improves creep strength of the steels, whereas most of added B forms unidentified borides, which are deemed almost ineffective to creep strength.
Journal ArticleDOI
On the Precipitation Sequence in a 10%Cr Steel under Tempering
Nadezhda Dudova,Rustam Kaibyshev +1 more
TL;DR: In this paper, two different precipitation processes have been identified, concurrently First, at 350°C, a dispersion of M2C phase with orthorhombic lattice appears, and at 525°C the phase is displaced by the formation of M23C6 carbide However, this process remains uncompleted.