Using the instrumented indentation technique for stress characterization of friction stir-welded API X80 steel
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- Using the instrumented indentation technique for stress characterization of friction stir-welded API X80 steel
- Lee, Y; Kim, Ju-Young; Kim, J. -Y.; Lee, J. -S.; Kims, K-H; Kwon, D.
- RESIDUAL-STRESS; SHARP INDENTATION; NANOINDENTATION
- Issue Date
- TAYLOR & FRANCIS LTD
- PHILOSOPHICAL MAGAZINE, v.86, no.33-35, pp.5497 - 5504
- An instrumented indentation technique (IIT) appears to be a promising alternative to conventional stress measurement methods, particularly for welds with rapid microstructural gradients, because it has high spatial resolution and is non-destructive. The technique is used to characterize the residual stress of a friction stir-welded joint of API X80 steel. The indentation load - depth curve is significantly affected by the presence of residual stress and the stress-induced load change at a given penetration is converted to a quantitative stress value through an analytical model. All indentation test results show good agreement with those from an energy-dispersive X-ray diffraction performed to assess the validity of the IIT. In addition, the microstructures in various regions of the friction stir-welded joint and their effects on local microhardness are discussed.
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