TITLE:
Estimation of the Yield Stress of Stainless Steel from the Vickers Hardness Taking Account of the Residual Stress
AUTHORS:
Osamu Takakuwa, Yusuke Kawaragi, Hitoshi Soyama
KEYWORDS:
Peening; Yield Stress; Hardness; Residual Stress
JOURNAL NAME:
Journal of Surface Engineered Materials and Advanced Technology,
Vol.3 No.4,
October
8,
2013
ABSTRACT:
In this paper, a method that uses the
Vickers hardness to estimate the yield stress of a metallic material with
taking account of residual
stress is proposed. Although the yield stress of bulk metal can be evaluated by
a tensile test, it cannot be applied to local yield stress varied by surface modification methods, such as the peening technique which introduces
high compressive residual stress at the surface. Therefore, to evaluate the
local yield stress employing a relatively easy way, the Vickers hardness test was conducted in this
paper. Since the Vickers hardness depends on both the residual stress and the
yield stress, the relationship between the residual stress and the Vickers
hardness was experimentally examined. It was concluded that the yield stress of
the surface treated by several peening techniques can be estimated from the Vickers
hardness once this has been corrected for residual stress.