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cperez
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The lower yield point for an iron that has an average grain diameter of 5x10^-2mm is 135 MPa. At a grain diameter of 8x10^-3, the yield point increases to 260 MPa. At what grain diameter will the lower yield point be 205 MPa?
Hall-Petch Equation:
σy = σo + ky(d^-(1/2))
135 MPa = σo + ky(22.36)
260 MPa = σo + ky(89.44)
I know this is going to sound silly, but I don't know to solve for two unknowns. If someone could just show me how to solve for one of them, I could solve for the other and figure the rest out.
Homework Equations
Hall-Petch Equation:
σy = σo + ky(d^-(1/2))
The Attempt at a Solution
135 MPa = σo + ky(22.36)
260 MPa = σo + ky(89.44)
I know this is going to sound silly, but I don't know to solve for two unknowns. If someone could just show me how to solve for one of them, I could solve for the other and figure the rest out.