u 
Fig. 5: Damaged stream plate of heat exchanger and its fractograpi.- 
Absu 
Conclusions Gu 
— Citric acid caused 50% reduction of fatigue life for type 304 steel and about 40% for 316L. axcd 
Alkaline solution considerably increased the fatigue life in both cases. Fatigue life of 316L type dien 
steel was higher than 304 in both environments. I 
The fracture surfaces of specimens tested in all environments exhibited an intergranular — EA 
transgranular mode of cracking. There was also observed fatigue striations. form: 
Ductile fractures with some brittle fracture zones were observed in both cases of specimens — zo 
tested in corrodant and in air. 
Microcracks were initiated on pits and microvoids and inclusions determined their growth. oo 
Acknowledgements 
The authors acknowledge to the support of the State Committee for Scientific Research, 
Poland (grant No 1376/T07/98/14). mr 
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