Heat treating a reworked part -necessary?
I have a pin (4" length, 1.5" diameter) of 4340 that was heat treated to RC40 which requires rework: turning down the diameter about .004" to meet the drawing's spec. Does the part require heat treatment again (RC40 specified on drawing)? More importantly, can someone explain why heat treatment would be required again after rework is done? I don't think the machinist intends on annealing it before reworking. I'm not a manufacturing engineer and just trying to understand. Thanks!