Heat-resistant alloy for ultra-supercritical thermal power steam turbine sets
An ultra-supercritical, heat-resistant alloy technology, applied in the field of heat-resistant alloys, can solve the problems of high cost and low thermal fatigue of nickel-based alloys
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Embodiment 1
[0011] According to the above alloy range, 5 heats of test materials were smelted, and the Ni content was 32%, 34%, 36%, 38% and 40%, and the content of other alloy elements was not much different. The chemical composition is shown in Table 1. After the same heat treatment process, the room and high temperature mechanical properties of each test material were tested. The mechanical properties at room temperature are shown in Table 2. It can be seen that each test material has good room temperature strength, plasticity and toughness, and the comprehensive mechanical properties at room temperature are excellent.
[0012] Table 1 Embodiment 1 of the present invention uses chemical composition
[0013] serial number
C
Si
mn
P
S
Cr
Ni
Ti
Al
Nb
V
Ce
B
Zr
Fe
1
0.019
0.071
＜0.005
＜0.005
0.0019
22.09
32.30
1.70
1.68
1.51
0.12
0.0095
0.0023
0.04
Remain ...
Embodiment 2
[0020] The 1# and 2# alloys in Example 1 after heat treatment were subjected to long-term aging at 650°C, and the 4# and 5# alloys were subjected to long-term aging at 700°C. The aging time was 100h, 300h, 1000h and 3000h. The room and high temperature mechanical properties test results of each test material after long-term aging are shown in Table 4 and Table 5.
[0021] It can be seen from Table 4 that during the long-term aging process, the room temperature tensile strength of some test materials first increased and then decreased, and some test materials continued to rise, while the room temperature yield strength of each test material showed a gradual upward trend, and the plastic toughness showed a gradual downward trend .
[0022] Table 4 Comparison table of mechanical properties at room temperature in Example 2 of the present invention
[0023]
[0024] It can be seen from Table 5 that with the prolongation of the aging time, the 650°C high temperature tensile stre...
Embodiment 3
[0028] A 700°C endurance test was carried out on each test material in Example 1 after heat treatment, and the test results are shown in Table 6. Simultaneously, the 2# test material in the implementation example 1 after the heat treatment has been carried out the persistent experiment of 650 ℃, and the experimental results are shown in figure 1 , it can be seen that the extrapolated stress of the 650°C durability of the 2# test material is about 200MPa, and it has a high durability.
[0029] Table 6 Comparison Table of Durable Creep Performance of Embodiment 3 of the present invention
[0030]
[0031] In summary, G110 alloy can be used as an alternative material for long-term service heat-resistant components in high-temperature gas or steam corrosion environments with parameters of 650 ° C to 700 ° C.
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