Thermally treated metallic materials and related methods
a technology of metallic materials and related methods, applied in the field of thermal treatment of metallic materials, can solve problems such as problems such as problems such as the problem of rapid quenching of metallic material articles from elevated temperature to desired lower temperature, and achieve the effect of preventing undesired grain growth
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example 1
[0075]A 6061 wrought aluminum sheet having a chemical composition in weight percent of 0.15 Mn, 0.4-0.8 Si, 0.15-0.35 Cr, 0.15-0.4 Cu, 0.7 Fe, 0.25 Zn, 0.8-1.2 Mg, 0.15 Ti, with the remainder being Al and other incidental impurities was provided as thin sheet having a thickness of 1 mm. The thin sheet was annealed in the hot zone at 775° F. for 2 hours followed by controlled cooling at 50° F. per hour down to 500° F., followed by air cooling. The material was subjected to an age hardening heat treatment at 350° F. for 8 hours followed by air cooling in order to produce the T6 temper. Mechanical properties of the 6061 aluminum sheet with the T6 temper showed an average tensile strength of 45,000 psi, yield strength of 40,000 psi, shear strength of 31,000 psi, elongation to failure of 12%, and a Brinell hardness of 95.
Steel Alloys
example 2
[0076]A cold rolled steel alloy sheet having a thickness of 0.5 mm and a chemical composition within the range and weight percent of 0.085-0.11 C, 1.4-2.0 Mn, 0.09-0.21 Mo, 0.02-0.05 Al, 0.16-0.5 Si, 0.13-0.5 Cr, 0.016 max Ti, 0.06 max Ni, 0.003 max S, 0.015 max P, 0.006 max N, and with the balance being iron and incidental metal impurities can be processed through the metal thermal treatment system 300 and subjected to an intercritical annealing in the hot zone at temperatures between 760-800° C. Thereafter, the intercritically annealed steel alloy sheet can be rapidly cooled to a temperature of less than 450° C. in the cold zone. The rapidly cooled sheet has a ferrite-martensite microstructure with less than 6 volume percent bainite, a 0.2% yield strength of at least 330 MPa, a tensile strength of at least 590 MPa, a total elongation to failure of at least 18%, and a uniform elongation of at least 10%.
Cobalt and Nickel Solid-Solution-Strengthened Alloys
[0077]Although Co-base and N...
example 3
[0078]One Co-base and two Ni-base solid-solution strengthened alloys having the following nominal chemical compositions (wt %) can be processed through the metal thermal treatment system 300.
[0079]Cobalt Alloy (C1): 10 Ni, 20 Cr, 15 W, 3 max Fe 1.5 Mn, 0.4 max Si, 0.10 C with the balance Co (approximately 51 et %) and incidental impurities (commercially available as HAYNES® 25 alloy).
[0080]First Nickel Alloy (N1): 22 Cr, 14 W, 2 Mo, 3 max Fe, 5 max Co, 0.5 Mn, 0.4 Si, 0.3 Al, 0.10 C, 0.02 La, 0.015 max B, with the balance Ni (approximately 57 wt %) and incidental impurities (commercially available as HAYNES® 230® alloy).
[0081]Second Nickel Alloy (N2): 22 Cr 18 Fe 9 Mo 1.5 Co 0.6 W 0.10 C 1 max Mn 1 max Si 0.008 B with the balance Ni (approximately 47 wt %) and incidental impurities (commercially available as HAYNES® Hastelloy® X alloy).
[0082]Typical solution annealing temperatures provided by the thermal treatment system 300 for the C1 and N1-N2 alloys are shown in Table 1 below. Su...
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