Normal and dwell fatigue behavior of a near-alpha titanium alloy - IMI 834

¹ Department of Materials Engineering, Indian Institute of Science, Bangalore 560012, India
² Department of Materials Sciences and Engineering, Indian Institute of Technology Kanpur, Kanpur 208016, India
³ Defence Metallurgical Research Laboratory, Hyderabad 500066, India

^* Author to whom all correspondence should be addressed: satyamsuwas@iisc.ac.in; +91-80-22933408

Abstract

Dwell sensitivity of titanium alloys at ambient temperature (~250 C) is a well-known phenomenon, although the question about the exact micromechanical reasons responsible for this still remains open. In this work, the normal and dwell fatigue response of a near-alpha titanium alloy, IMI 834, is studied. Samples with three different microstructures, namely, fully lamellar, fully equiaxed and bimodal, are evaluated for their dwell fatigue behaviors. A reduction in fatigue life by at least an order of magnitude is seen in all the three microstructures. Large plastic strain accumulation (almost equal to the monotonic ductility) was observed during the dwell fatigue loading condition and this is held responsible for this large debit in fatigue life. The normal fatigue lives decreased in the order, bimodal > fully equiaxed > fully lamellar, while the dwell fatigue lives decreased in the order, fully equiaxed > fully lamellar > bimodal. Bimodal microstructure showed a dwell fatigue debit of 17, while fully lamellar and fully equiaxed showed a debit of 9 and 10, respectively.