What must be taken into account when using electrochemical machining for parts that need good dynamic strength and fatigue resistance? Select all choices that apply.
Select 2 correct answer(s)
a) Absence of residual stresses. Subsequent treatment is needed to introduce compressive residual stresses.
b) Chemicals may etch material around grain boundaries at a higher rate. These small cracks represent stress concentrators so additional treatment is needed to remove them, or special care should be taken to avoid grain boundary attack during ECM.
c) There are no negative aspects of ECM on fatigue strength.
d) Splatters that occur at edges.