1411 174ph Stainless Steel

17-4PH stainless steel is a martensitic alloy that possesses a good balance of strength, toughness, and corrosion resistance for temperatures below about 350°C. It is susceptible to stress corrosion cracking when tempered to a hardness above about Rc40. 17-4PH contains about 4% copper. The copper precipitates as nearly pure copper during tempering. There are several commercial heat treatments for 17-4PH that yield a different combination of properties. The H1075 heat treatment is often used where the component may be exposed to corrosive conditions. Briefly, the H1075 heat treatment is an austenization at 1066°C and a temper at 634°C. It is this heat treatment that was given to the material deposited by the Penn State process; the results are shown in Table 14.5.

It is important to note that the data given for the material processed by Penn State are preliminary and were taken from the first batch of 17-4PH deposited; it should be assumed that this is a nonoptimized process. Improvement in the mechanical properties could be achieved with further process development.

The chemical analysis of the 17-4PH material is shown in Table 14.6. Note that the oxygen content in the powder is high. (Typically stainless steel powder

TABLE 14.5 Mechanical Properties of 17-4PH
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