The rising load test results of Ti-6Al-4V plate at various displacement-increasing rates were compared with the conventional constant load test results to confirm the validity of the rising load test as a method to determine the susceptibility (K 1 SCC) to stress corrosion cracking (SCC). The rising load test technique was applied to three kinds of Ti-6Al-4V alloy products and a newly developed high-strength, low-alloy titanium plate. It was made clear that the acicular structures in the Ti-6Al-4V alloys were less susceptible to SCC than an equiaxed structure, and an acicular structure with fine grain size was barely susceptible to SCC. The high-strength, low-alloy titanium was regarded as the material, with high SCC resistance that could be used in marine environments. Finally, the SCC propagating mechanism of these titanium-based materials in seawater was discussed based on the load-displacement relationships during the SCC tests and fractographical analysis. As a result, it was shown that anodic dissolution contributed to SCC propagation.

Subject
Constant load, Materials, Microstructure, Structures, Fracture surfaces, Crack propagation, Stress cracking, Seawater, Titanium, Immersion, Titanium alloys, Stress corrosion cracking, Test specimen
Keywords:
titanium alloy, titanium, stress corrosion cracking, seawater, stress intensity factor, strain rate, fractography
© 1993 Association for Materials Protection and Performance (AMPP). All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means (electronic, mechanical, photocopying, recording, or otherwise) without the prior written permission of AMPP. Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
1993
Association for Materials Protection and Performance (AMPP)
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