Mould material for detecting high-temperature fatigue performance and preparation method of mould material
A mold material and fatigue performance technology, which is applied in the high-temperature fatigue performance detection of plates and high-strength steel rods, can solve the problems of high cost of fine-grained materials, achieve the effects of preventing notch cracking, improving notch sensitivity, and increasing high-temperature strength
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Embodiment 1
[0034] A mold material used for high temperature fatigue performance testing, its composition elements and weight percentages are: Ni: 50%; Nb: 5%; Ti: 1.0%; C≤0.1%; the rest is Fe.
[0035] The preparation method of the mold material used for high temperature fatigue performance detection, the steps are:
[0036] A) Vacuum induction furnace smelting: the raw materials are subjected to vacuum induction furnace smelting according to the ratio of Ni: 50%; Nb: 5%; Ti: 1.0%; ;
[0037] B) Diffusion treatment of the steel ingot in a heating furnace at 1190°C for 5 hours, so that the composition of the steel ingot is uniform, and then air-cooled;
[0038] C) Heating the steel ingot to 1110°C, forging, air cooling after forging, the metallographic structure after forging is as follows figure 1 As stated, the detected grain size is 10 μm;
[0039] D) heat-preserve the forged steel ingot at 1100°C, heat it for 50 minutes, and then air-cool it. The grain size is 110 μm, as figure 2 S...
Embodiment 2
[0049] With embodiment 1, the difference is that the constituent elements and weight percent of the test material are: Ni: 40%; Nb: 6%; Ti: 0.8%; C≤0.1%; the rest is Fe; the steel ingot in step A) The radius is 149.7mm; in step B), the steel ingot is diffused in a heating furnace at 1200°C, and the holding time is 6.5h; in step C), the steel ingot is heated to 1120°C, and the grain size of the obtained material is d 0 is 15 μm; in step D), the forged steel ingot is subjected to heat preservation treatment at 1110° C. for 50 minutes, and the grain size d of the obtained material is 110 μm, and the relationship also satisfies the following relationship:
[0050] d 2.682 = d 0 2.682 + 4.733 × 10 18 t 1.313 exp [ - 295.406 / R ...
Embodiment 3
[0054] With embodiment 1, the difference is that the constituent elements and weight percent of the test material are: Ni: 60%; Nb: 4%; Ti: 1.2%; C≤0.1%; the rest is Fe; the steel ingot in step A) The radius is 153mm; in step B), the steel ingot is diffused in a heating furnace at 1180°C, and the holding time is 8.5h; in step C), the steel ingot is heated to 1100°C, and the grain size of the obtained material is d 0 is 12 μm; in step D), the forged steel ingot is subjected to heat preservation treatment at 1090 ° C for 50 minutes, and the grain size d of the obtained material is 110 μm, and the relationship also satisfies the following relationship:
[0055] d 2.682 = d 0 2.682 + 4.733 × 10 18 t 1.313 exp [ - 295.406 / R ...
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