Abstract:
After repeated complaints from customers about failure, the crown
and pinion assembly of the vehicle was analyzed by standard metallurgical
methods. Standard material composition of the part was confirmed by chemical
analysis. Tooth contact analysis was done to understand the contact and
sequence of failure. Micro hardness test was done to understand about the
hardness of the specimen. The nature of fracture is studied by subjecting the
specimen to micro-structural study. It was found that the effect of combination
of low case hardness and improper composition was augmented by improper
alignment while assembling caused premature failure of the component.
