Abstract
In this work, nanoindentation was carried out for the extension of the statistical analysis application into plastic property of constituent phases in virgin materials and heat-affected region after welding of structural steels. The influence of the heat during welding on the microstructural phases and their mechanical properties in two types of popular structural steels was then investigated. The experimental and analysis results revealed that the yield strength spectrum obtained from nanoindentation tests can be used in the accurate and reliable identification of the constituent microstructural phases and their strength in structural steels by applying statistical deconvolution analysis. The heat during welding leads to the transformation of the microstructural phases and causes the increase of both hardness and yield strength of microstructural phases including ferrite and pearlite in structural steels. The correlations between the mechanical properties of the constituent phases in both virgin steels and heat-affected zones, including yield strength σy, representative stress σ0, strain hardening exponent n, elastic modulus E, and hardness H, were also investigated and discussed.
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