Method of estimating tensile properties of IN718 cast HIPed components
AssigneeGeneral Electric Company
InventorLing Yang
Life of this patent
Estimating the term…
Abstract
A method to estimate the tensile properties of HIPed cast IN718 components at various grain sizes and different operating temperatures by using transfer functions to estimate ultimate tensile strength, yield strength, and elongation.
Claims9
A method of estimating ultimate tensile strength (UTS) of a HIPed IN718 cast component at an operating temperature comprising determining the average grain size of the component and solving the following equation:
- UTS=(238.3−19.44×GS+3.355×GS2−0.0889×(T−32)+2.28×10−5×(T−32)2−4.39×10−4×GS×(T−32))×7×106
- whereby GS is the average grain size in meters, T is temperature in degree C., and UTS is in the unit of Pascal.
A method of estimating 0.2% yield strength (0.2%YS) of a HIPed IN718 cast component at an operating temperature comprising determining the average grain size of the component and solving the following equation:
- 0.2%YS=(219.2−23.38×GS+4.447×GS2−0.089×(T−32))×7×106
- whereby GS is the average grain size in meters, T is temperature in degree C., and 0.2%YS is in the unit of Pascal.
A method of determining the 0.02% yield strength (0.02%YS) of a HiPed IN718 cast component at an operating temperature comprising determining the average grain size of the component and solving the following equation:
- 0.02%YS=(130−25.04×GS+5.1×GS2+5.56×10−3×(T−32)−4.44×10−4×GS×(T−32))×7×106
- whereby GS is the average grain size in meters, T is temperature in degree C., and 0.02%YS is in the unit of Pascal.
A method of determining the elongation (elong.) of a HIPed IN718 cast component at an operating temperature comprising determining the average grain size of the component and solving the following equation
- elong.=139.3+1.3×GS−1.421×GS2−0.128×(T−32)+1.57×10−3×GS×(T−32)
- whereby GS is the average grain size in meters, T is temperature in degree C., and elongation is in the unit of percentage %.
A method of estimating grain size for a HEPed IN718 cast component with a desired ultimate tensile strength (UTS) or 0.2% yield strength at an operating temperature comprising solving one of the following equations for GS:
- UTS=(238.3−19.44×GS+3.355×GS2−0.0889×(T−32)+2.28×10−5×(T−32)2−4.39×10−4×GS×(T−32))×7×106
- whereby GS is the average grain size in meters, T is temperature in degree C., and UTS is in the unit of Pascal or
- 0.2%YS=(219.2−23.38×GS+4.447×GS2−0.089×(T−32))×7×106 whereby GS is the average grain size in meters, T is temperature in degree C., and 0.2%YS is in the unit of Pascal.
Dependencies are inferred from the claim text.