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Technical Briefs

Study on Hardness and Elastic Modulus of Surface Nanostructured 304 Stainless Steel Using Two Mechanical Methods

[+] Author and Article Information
Gang Ma

 Taizhou Supervision and Inspection Center of Special Equipment, 93 Wei Er Road, Taizhou, Zhejiang 318000, China; School of Mechanical and Power Engineering,  Nanjing University of Technology, 5 Xin Mo Fan Road, Nanjing, Jiangsu 210009, Chinagmnjut@163.com

Xiang Ling

School of Mechanical and Power Engineering, Nanjing University of Technology, 5 Xin Mo Fan Road, Nanjing, Jiangsu 210009, Chinaxling@njut.edu.cn

J. Pressure Vessel Technol 133(3), 034501 (Apr 04, 2011) (4 pages) doi:10.1115/1.4002554 History: Received March 02, 2010; Revised September 13, 2010; Published April 04, 2011; Online April 04, 2011

Ultrasonic impact treatment (UIT) can be used to create a thin nanostructured surface layer that plays a significant role in enhancing the overall strength, fatigue life, and corrosion resistance of the treated material. The hardness and elastic modulus of surface nanostructured 304 stainless steel treated by UIT have been investigated by nanoindentation and microhardness measurements. The hardness of the top nanostructured surface layer and its elastic modulus are about 38% and 30% higher, respectively, than those of the bulk material in the nanohardness testing. Also, the hardness is increased by about 23% in the Vickers microhardness testing. The nanohardness of the nanostructured surface layers decreases with depth and then trends to stable values. A hardened layer is found in the impact zone and the thickness is approximately 450500μm. All results demonstrated that the surface nanocrystallization can effectively enhance the mechanical properties of the 304 stainless steel.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic diagram of UIT

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Figure 2

Schematic diagram of UIT processing

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Figure 3

TEM observations obtained from the subsurface layer in the sample treated for 120 s

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Figure 4

Characteristic curves of nanostructured layer and matrix

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Figure 5

Variation of the nanohardness with the distance to surface

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Figure 6

Variation of the elastic modulus with the distance to surface

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Figure 7

Microhardness distribution of the sample in the depth direction

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