Metallurgical and Stress State Factors Which Affect the Creep and Fracture Behavior of 9% Cr Steels

<div>Analysis regarding the behavior of Tin (Sn), as plotted against the EPRI database of Grade 91 base metal using a Larson Miller parameter (<i>C</i> = 31), adapted from [<a href="/journals/amse/2018/6789563/#B27">27</a>]. Note the reduction in strength for all casts with Sn. Even at the lowest value of 0.005 weight percent, the behavior is at the minimum (mean-20%) line. This reduction in strength may also be partially attributed to the presence of relatively high levels of Al in all examined heats.</div>

Advances in Materials Science and Engineering

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Figure 4

Figure 4: Metallurgical and Stress State Factors Which Affect the Creep and Fracture Behavior of 9% Cr Steels 