Callister - An introduction - 8th edition

280 • Chapter 8 / Failure
values in relation to those for the metal alloys
that are tabulated in Table 8.4.
Data Extrapolation Methods
8.D3 An S-590 alloy component (Figure 8.32)
must have a creep rupture lifetime of at least
100 days at 500C (773 K). Compute the maximum
allowable stress level.
8.D4 Consider an S-590 alloy component (Figure
8.32) that is subjected to a stress of 200 MPa
(29,000 psi). At what temperature will the
rupture lifetime be 500 h?
8.D5 For an 18-8 Mo stainless steel (Figure 8.35),
predict the time to rupture for a component
that is subjected to a stress of 80 MPa (11,600
psi) at 700C (973 K).
8.D6 Consider an 18-8 Mo stainless steel component
(Figure 8.35) that is exposed to a
temperature of 500C (773 K). What is the
maximum allowable stress level for a rupture
lifetime of 5 years? 20 years?
Figure 8.35 Logarithm stress versus the Larson–Miller
parameter for an 18-8 Mo stainless steel. (From F. R.
Larson and J. Miller, Trans. ASME, 74, 765, 1952.
Reprinted by permission of ASME.)
10 3 T(20 + log t r )(°R–h)
25 30 35 40 45
50
100
Stress (MPa)
100
10
Stress (10 3 psi)
10
12 16 20 24 28
1
10 3 T(20 + log t r )(K–h)