Indigenously developed age-hardenable Ni-Cr-Mo-based superalloy (IAHNBS) overcome strength limitation of solid solution hardened alloy by exhibiting much higher mechanical strength both at room temperature as well as at elevated temperatures upto about 750°C. The alloy can be easily tuned to meet the desired mechanical properties in different applications by adjusting the solutes concentration within a specific range during melting. Its indigenously developed nature promotes self-reliance and reduces dependence on costly imports. Moreover, this technology offer showcases India's prowess in research and innovation, offering a tool that can contribute significantly in alloy and metal industries.

1. Age-hardened alloy overcome strength limitation of commercially available Ni-Cr-Mo based alloys.
2. Age-hardened alloy derive its strength due to coherent nano-sized precipitates of γ" phase with a Ni₃(Cr,Mo,Ti,W) stoichiometry.
3. Age-hardened alloy retain strength at elevated temperatures up to 750 °C due to high thermal stability of these precipitates up to about 800°C.
4. Age-hardened alloy exhibits much higher room temperature yield strength (YS) and ultimate tensile strength (UTS) in the range of 427-733 MPa and 900-1210 MPa, respectively, with minimum ductility of about 40%.
5. The alloy exhibits YS within 340-500 MPa and UTS within 640-830 MPa at 750°C, comparatively higher than commercial Ni-Cr-Mo-based alloys belonging to same family.
6. The gamma-double prime phase forms with Ni₃(Cr,Mo,Ti,W) stoichiometry without niobium, unlike the Ni₃Nb gamma-double prime phase that forms in Alloy 718.

1. Petro-Chemical industries: reaction vessels, evaporators, stack liners, ducts, scrubbers, stack-gas re-heaters, pump and paper production, Flue gas desulfurization systems, waste treatment, tubes.
2. Power Industries: combustion chambers, power point boiler, heat exchangers, Super-critical steam generator, automobile components.

Ni-based superalloys are preferred choice for high temperature applications requiring good mechanical strength as well as corrosion resistance. Ni-based alloys are broadly categorized into 3 categories: (i) Alloys containing a mainly a high amount of Cr (typically in the range 19 - 33%) and may contain small amounts of Mo (up to about 10 %) for strongly oxidizing corrosive media like HNO₃ acid solutions, which are commercially available as both solid-solution hardened and age age-hardened alloys; (ii) Alloys containing a high amount of Mo (typically in the range 16 - 25%) with some Cr for strongly reducing media like HCl / HF and H₂SO₄ acids, which are also commercially available in both solid-solution hardened and age age-hardened alloys; (iii) Alloys containing sufficiently high amounts of both Cr (in the range 16 - 22%) and Mo (in the range 13 - 16%) for multipurpose applications in both types of corrosive media, which only exist in solid-solution hardened condition. Therefore, it has long been desired to commercially exploit age-hardening to impart higher strengths to Ni-Cr-Mo alloys containing about 16 - 22 %Cr and about 13 - 16 %Mo. Indigenously developed age-hardenable Ni-Cr-Mo-based superalloy overcome strength limitation of solid solution hardened alloy by exhibiting much higher mechanical strength both at room temperature as well as at elevated temperatures upto about 750°. The alloy can be easily tuned to meet the desired mechanical properties in different applications by adjusting the solutes concentration within a specific range during melting. Its indigenously developed nature promotes self-reliance and reduces dependence on costly imports. Moreover, this technology offer showcases India's prowess in research and innovation, offering a tool that can contribute significantly in alloy and metal .

Potential application areas of new precipitate strengthened alloy are:

1. Petro-Chemical industries: reaction vessels, evaporators, stack liners, ducts, scrubbers, stack-gas re-heaters, pump and paper production, Flue gas desulfurization systems, waste treatment, tubes.
2. Power Industries: combustion chambers, power point boiler, heat exchangers, Super-critical steam generator, automobile components.

1. Much higher room temperature yield strength (YS) and ultimate tensile strength (UTS) in the range of 427-733 MPa and 900-1210 MPa, respectively with minimum ductility of about 40% due to the precipitation of particles with Ni₃(Cr,Mo,Ti,W) stoichiometry.
2. Potential substitute of solid-solution strengthened commercial alloys like C-22, C-276, etc.
3. The alloy preserve age-hardenable strength within 340-500 MPa and UTS within 640-830 MPa at 750°C which is comparatively higher than commercially existing other Ni-Cr-Mo-based alloys belonging to same family.
4. Stabilization of gamma-double prime phase with Ni₃(Cr,Mo,Ti,W) stoichiometry, without niobium, unlike the main hardening Ni₃Nb gamma-double prime phase in Alloy 718.
5. High thermal stability of the Ni₃(Cr,Mo,Ti,W) phase up to about 800 °C in the new alloy, unlike Ni₃Nb gamma-double prime phase which transforms to deleterious delta phase at temperatures above 650 °C and embrittles the alloy.

The age-hardenable property in Ni-Cr-Mo based alloys have has been induced by suitable combination of Cr, Mo, W and Ti solutes to stabilizes coherent nano-sized precipitates of γ" phase with a Ni₃(Cr,Mo,Ti,W) stoichiometry. The age-hardening strength at elevated temperatures up to 750 °C was achieved by high thermal stability of these precipitates up to about 800°C.

1. Alloy Composition: The concentration of solutes in the alloy restricted within the range: Cr=16-21%; Mo=10.5-15.8wt %; W=3.7-8.6%; Ti=1.5-2.7% and rest Ni.
2. Trace impurities: Superalloy tolerate other elements / impurities, due to process-related additions to maximum values of 2.0% Iron (Fe), 0.50% Silicon (Si), 1.0% Manganese (Mn), 0.03% Carbon (C), 0.04% Nitrogen (N), and 0.015% Sulphur (S) and Phosphorous (P) each.
3. Thermo-mechanical processing: At lab scale melted ingot / button must be homogenized at 1250°C for 30 h followed by either cold rolling operation followed by recrystallization heat treatment at 1200°C for 30 min or high temperature hot rolling operation at temperatures > 1150°C. Industrial scale ingot can be directly forged at temperatures 1200-1250°C.
4. Age-hardening treatment: Solution treatment at 1100°C / 1 h followed by age-hardening treatment at 680°C for 100 h.
5. Age-hardnened alloy must exhibit minimum hardness of 250 VHN within 100 h of ageing at 680°C.

1. Alloy preparation: Melting furnace, Rolling / forging equipment, Heat treatment furnaces.
2. Characterization facility: Polishing equipment, Optical microscope, X-ray fluorescence (XRF) equipment, hardness tester, tensile testing machine.

1. All raw materials are easily available in local market.

1. One diploma holder & 2 trained technicians to start the production.