A Deformation Process of Nickel-based Alloy and Iron-Nickel-based Alloy
A technology of iron-nickel-based alloy and nickel-based alloy, which is applied in the field of alloy deformation processing technology, can solve the problems of reducing permanent strength, easy cracking and high strength, and achieve the effect of reducing permanent strength, high plasticity and toughness, and low yield strength
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Embodiment 1
[0041] Comparative sample 1: 1150 ° C × 1 hour solid solution water cooling, hardness HB168, R p0.2 It is 314MPa.
[0042] Comparative sample 2: 1150℃×1 hour solid solution water cooling + 800℃×16 hours aging air cooling, hardness increased to HB304, R p0.2 It is 728MPa, the strength and hardness are too high, and it is not suitable for deformation processing.
[0043] As a comparison with the heat treatment state before deformation processing in the above two existing processes, heat treatment tests at different temperatures were carried out on the materials.
[0044] Comparative sample 3: 1150°C x 1 hour solid solution water cooling + 700°C x 4 hours heat treatment and air cooling. The hardness of comparative sample 3 after heat treatment is HB268, and the microstructure photo is shown in figure 2 , due to the low temperature, no carbide precipitated at the grain boundary.
[0045] Comparative sample 4: 1150°C x 1 hour solid solution water cooling + 850°C x 2 hours heat...
Embodiment 2
[0050] Endurance strength tests under three conditions were carried out on Inconel 740H.
[0051] Comparative sample 5: It is a standard heat treatment material (1150°C×1 hour solid solution water cooling + 800°C×16 hours aging air cooling), and it is processed into a durable strength sample. The high temperature durable strength test is carried out at 750°C and 292MPa, and the fracture time is 503 hours . Figure 7 This is the microstructure photo of the permanent fracture sample away from the fracture area, and there are obvious carbides in the grain boundary.
[0052] Comparative sample 6: Adopt the conventional process of the existing deformation processing technology, that is, carry out 11% cold deformation on the material cooled by solid solution water at 1150°C×1 hour, and then perform aging treatment at 800°C×16h, and process it into a durable strength sample The high-temperature endurance strength test was carried out at 750°C and 292MPa, and the rupture time was 380...
Embodiment 3
[0055] Process example sample 5 according to the process disclosed in the present invention, that is, carry out an intermediate heat treatment at 1010 ° C × 2 hours for the material cooled by solid solution water at 1150 ° C × 1 hour, R p0.2 It is 455MPa, followed by 13% cold deformation, and then aging treatment at 790°C×8h, processed into a durable strength sample for high-temperature durable strength test at 750°C and 292MPa, and the fracture time is 582.6 hours. Even though the amount of deformation is greater than that of Comparative Sample 6, its life is still longer than that of Comparative Sample 6, even higher than that of Comparative Sample 5 without deformation processing.
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