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:The residual stresses that generates upon carburising and hardening are allowed to undergo a relaxation process, and produce a curveture in 080M15 steel bars. The degree of :curveture is found to vary depending .upon the carbon distribu-. 'tion. The fibre stress necessary to reduce the deflection to: zero is evaluated and related to the surface residual stresses. The residual stresses incarburised & hardened 080M15 steel :is fund compressive when decarburisation is not allowed to 'take place, and tensile upon the occurance of decarburisation: Carburising conditions are veried to produce different carbon profiles, that influence the residual stress pottern.2 :The highest compressive residual stresses of 661 MN/.m 'resulted from boost-diffuse carburising, in which the carbon content of 0.8% is maintained constant to a depth of 0.3mm. Compressive residual stresses are lowered upon the occurance :of retained austenite and even further when carbides are also 'formed.

MECHANICAL METHOD TO DETERMINE RESIDUAL STRESSES IN CARBURISED STEEL