Effect of Static Aging on Mechanical Properties of an 18Cr-8Ni-W-Nb-V-N Stainless Steel

Ilya Nikulin; Rustam Kaibyshev

doi:10.4028/www.scientific.net/MSF.706-709.2211

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HomeMaterials Science ForumMaterials Science Forum Vols. 706-709Effect of Static Aging on Mechanical Properties of...

Effect of Static Aging on Mechanical Properties of an 18Cr-8Ni-W-Nb-V-N Stainless Steel

Abstract:

The interrelations between microstructure, precipitation and mechanical properties of the 18Cr-8Ni-W-Nb-V-N austenitic stainless steel were examined under long-term aging at 650°C. It was shown that aging leads to decreasing strength characteristics with increasing aging time despite the fact that hardness tends to increase. In none-aged condition the present steel exhibits superior impact toughness of about 255 J/cm^-2. This values decreases gradually at the early stage of the aging. After 1000 hours exposure the impact toughness is 195 J/cm^-2 and decreases sharply to 135 J/cm^-2 at 3000 hours. However, an evidence for ductile fracture was found even after long-term aging. Degradation in impact toughness and mechanical properties with aging is discussed in relation to microstructure evolution, precipitations of the secondary phase and fracture mechanisms.

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Materials Science Forum (Volumes 706-709)

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2211-2216

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https://doi.org/10.4028/www.scientific.net/MSF.706-709.2211

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Online since:

January 2012

Authors:

Ilya Nikulin, Rustam Kaibyshev

Keywords:

Austenite, Stainless Steel (SS), Static Aging

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