How to select induction surface hardening and finished grinding conditions in order to ensure high compressive residual stresses on machine parts surface
Grum, Janez
Induction surface hardening creates very desirable residual stresses in hardened surface layer. Residual stresses are always of compressive nature and are usually present to the depth of the ...induction - hardened layer. In general, efforts should be made that after induction surface hardening we get low or moderate residual stresses in the transition area. Manufacturing engineers are often confronted with the question of how to achieve this kind of residual stress profile. It should be emphasized here that because of their lower heat conductivity alloyed steels for surface hardening are very difficult to treat and it is difficult to ensure desirable residual stresses in the transition area. That is why special alloyed steels are available that in this respect display a more favourable behaviour in heating and quenching. It is due to these difficulties that delamination of the surface to the very core may occur. By right selection of grinding wheel and grinding conditions taking into accounts physical and mechanical properties of the workpiece material will be kept back very favourable compressive residual stresses in the hardened surface layer. The relative grinding stress is obtained by measuring the residual internal stress after induction surface hardening and then by measuring on the same spot after induction surface hardening and grinding and then calculating their difference.
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