The effects of temperature on stress corrosion crack growth rates were studied on three heats of sensitized type 304 stainless steel and one heat of sensitized Alloy 600. Data were obtained using reversed dc potential drop crack monitoring on 25 mm CT specimens in 25 to 288°C water usually containing 200 ppb O2. Most data were obtained in 0.3 μM H2SO4 (0.267 μS/cm) although, in one heat, 0.1 μM HCl (0.076 μS/cm), 0.5 μM HCl (0.224 μS/cm), and air saturated water (≈ 8800 ppb O2 and ≈ 0.5 μS/cm) were also evaluated. The temperature dependence of all heats and materials was similar and showed a peak in crack growth rate at ≈200°C which typically was a factor of 30 to 100X higher than at 288°C. Growth rates decreased rapidly above 250°C compared to between 25 and 200°C; in many cases similar rates were observed at 25°C and 288°C. These data are compared with literature data using fracture mechanics and slow strain rate tests.

Subject
Crack growth, Water, Stainless alloys, Corrosion rate, Solubility, Corrosion cracking, Stress cracking, Constants, Dissolved oxygen, Stainless steel, Cracks, Corrosion potential, Slow strain rate technique
Keywords:
Temperature effects, crack growth rate, stress corrosion, corrosion fatigue, stainless steel, Inconel, nickel-base alloys, high temperature water, water chemistry, ionic impurities
© 1992 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).
1992
Association for Materials Protection and Performance (AMPP)
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