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Effect of Nitrogen on the Mechanical Properties of Heat-Resisting Steel

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Abstract:

In this paper, the effect of N addition on mechanical properties of 21Cr-11Ni austenitic heat-resisting stainless steel was investigated. Scanning electron microscopy was used to study the fracture surfaces in the steels. N in 21Cr–11Ni heat-resisting steel can play a role of stabling austenite and ensuring the structure and mechanical properties in high temperatures. Fracture is changed from cleavage to ductile fracture to 21Cr–11Ni heat-resisting steel, and the strength of test steel are improved at room temperature by adding N, the tensile strength is increased by 8.33%. And the creep rupture strength is improved. The fracture time of the steel containing 0.2% N is 3.2 times higher than the steel containing 0.14% N at 1144K.

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Periodical:

Advanced Materials Research (Volumes 535-537)

Pages:

571-575

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.535-537.571

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Online since:

June 2012

Authors:

Xiao Liu, Long Mei Wang

Keywords:

Austenite, Heat-Resisting Steel, Mechanical Property, Nitrogen Content

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© 2012 Trans Tech Publications Ltd. All Rights Reserved

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