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Investigation of defects and nanoparticles with martensitic phase transformation in surface nanostructured 316L stainless steel by slow-positron beam

Published online by Cambridge University Press:  31 January 2011

Xiaowei Wang ,
Liangyue Xiong ,
Xiaoguang Liu ,
Gang Liu ,
Chunlan Zhou  and
Long Wei
Gang Liu
Affiliation:
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People's Republic of China
Long Wei
Affiliation:
Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100039, People's Republic of China
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Abstract

In this article, we investigated the defects introduced by surface mechanical attrition treatment by Doppler-broadening spectroscopy of positron annihilation radiation in surface-nanostructured 316L stainless steel. Through the measurement of different thinning layers in the samples treated for 15 min, the slope of line shape parameter S versus wing parameter W curves showed three different values with depth responding to the change of defect configuration. An unusual change of S and W parameters near the surface was mainly from the effect of quantum-dot-like state caused by the formation of nanoparticles. Based on the change of S ˜ W with depth, the martensite phase transformation induced by strain could be estimated to occur within a depth of 35 μm.

Keywords

DefectsNanostructurePhase transformation
Type
Articles
Information
Journal of Materials Research , Volume 25 , Issue 3 , March 2010 , pp. 587 - 591
Copyright
Copyright © Materials Research Society 2010

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