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Table 1: Retention factors for stress-strain relationships of cold-formed steel at elevated temperatures Steel Retention Retention factor temperature T factor for for yield strength elastic modulus [k.
After the modified heat treatment was applied to a blade, the quality index dropped by about 50 MPa, but the yield strength and elongation remained above the minimum required, particularly the yield strength (Table 2).
It is assumed that the value for the shift changes in proportion with the percent change in principal yield strength as the stress state changes.
The strain rate and temperature dependence of the yield strength can be described by a stress-induced, thermally activated process (17-19), while the stress state dependence can be described by a modified Von Mises yield envelope (18, 19).
The increase in crystallinity observed on changing the chill-roll temperature from 30 to 60 [degrees] C in increments of 10 [degrees] C produced an anticipated increase in the high temperature values of the elastic modulus and yield strength.
By using Nanovea's Mechanical Tester in indentation mode, using a cylindrical flat tip, yield strength data can be easily obtained.
While M54(TM) has significantly greater yield strength and fracture toughness than S53, the resistance of S53 to general corrosion is far greater than that of M54(TM).
2 percent offset yield strength for both steels using marked points is presented in Fig.
3 MI, 27 HLMI, tensile yield strength of 3400 to 3800 psi, 2% secant flex modulus of 165 to 175 kpsi, and tensile impact strength of 100 to 140 ft-lb/[in.
It has been shown [9] that in some cases the yield strength plays the key role in determining the 3R (run, repair, replacement) decision for a particular component.
The importance is predicated on this: while HSS has yield strengths from 210 to 550 MPa and tensile strengths of 270 to 700 MPa, the ultrahigh strength steels (UHSS), which is the extreme end of the AHSS category, have a yield strength of 550 MPa or more and a tensile strength of 700 MPa or more.