Fatigue Failure Analysis of a Gear in Automobile Engine Coolant Pump

Table 1

Failed gear chemical composition compared to the related grade (% wt.).

Sample	C%	Mn%	Si%	S%	P%	Cr%	Mo%	Ni%
Gear #1	0.16	0.99	0.26	0.026	0.005	1.09	0.12	1.15
EN353	0.10–0.20	0.50–1.00	0.10–0.35	0.040 max	0.040 max	0.75–1.25	0.08–0.15	1.00–1.50