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A method for regulating the redistribution of boron at grain boundaries to improve the precipitation of the second phase at grain boundaries of super austenitic stainless steel
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An austenitic stainless steel, redistribution technology, applied in heat treatment process control, heat treatment equipment, manufacturing tools, etc., can solve the problems of elongation and toughness reduction, and achieve the effect of improving thermoplasticity and corrosion resistance
Active Publication Date: 2022-07-01
TAIYUAN UNIV OF TECH
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These precipitates increase the hardness, yield strength and tensile strength of the steel, while the elongation and toughness decrease
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Embodiment 1
[0027] Control of grain boundary redistribution in B-containing S31254 super austenitic stainless steel and the influence of temperature-sensitive aging second phase precipitation.
[0028] (1) Smelting in a vacuum induction furnace according to the alloy composition ratio, casting into an ingot in a vacuum state, and taking the ingot out of the mold after air cooling. The chemical composition of the super austenitic heat-resistant stainless steel by weight percentage is: C≤0.02%, Si≤1.00%, Mn≤1.00%, P≤0.03%, S≤0.005%, Cr: 19.50-20.50%, Ni: 17.50-18.50%, Mo: 6.00-6.50%, Cu: 0.5-1%, N: 0.18-0.25%, B≤0.006%, and the balance is Fe and other unavoidable impurity elements.
[0029] (2) The synthesized ingot was homogenized at 1250°C for 10 hours, and then forged and rolled into a sheet at 1200°C.
[0030] (3) After the steel plate is solution-treated at 1180°C for 60 minutes, it is slowly cooled to 1150°C at a rate of 3°C / min, and rapidly cooled with water. Through this method, a...
Embodiment 2
[0038] Control method of grain boundary redistribution of S32654 super austenitic stainless steel containing B
[0039] (1) Smelting in a vacuum induction furnace according to the alloy composition ratio, casting into an ingot in a vacuum state, and taking the ingot out of the mold after air cooling. The chemical composition of the super austenitic heat-resistant stainless steel by weight percentage is: C≤0.03%, Si≤1.00%, Mn: 2.00-4.00%, P≤0.03%, S≤0.005%, Cr: 24.00-25.00 %, Ni: 21.00-23.00%, Mo: 7.00-8.00%, Cu: 0.30-0.60%, N: 0.45-0.55%, B≤0.006%, the balance is Fe and other unavoidable impurity elements.
[0040] (2) The synthesized ingot was homogenized at 1280°C for 10 hours, and then forged and rolled into a sheet at 1200°C.
[0041] (3) After the steel plate is solution-treated at 1220°C for 60 minutes, it is slowly cooled to 1150°C at a rate of 2°C / min, and then rapidly water-cooled. Through this method, a part of boron can be segregated from the dissolved austenite t...
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Abstract
A method for controlling the redistribution of boron at grain boundaries and improving the precipitation of the second phase at grain boundaries of super austenitic stainless steel belongs to the technical field of preparation and application of super austenitic heat-resistant steel, and aims to achieve maximum The content of boron segregates at the grain boundaries of super austenitic stainless steel, thereby improving the thermoplasticity and corrosion resistance of super austenitic stainless steel. The invention does not change the microstructure such as the grain size of the super austenitic stainless steel through the combined treatment of step solid solution and low temperature heat preservation, but only makes the higher content of boron redistributed to the grain boundary. The element diffusion rate is regulated by the redistribution of boron at the grain boundary, the quantity and morphology of the second phase precipitation are improved, and the thermoplasticity and corrosion resistance are further improved.
Description
technical field [0001] The invention belongs to the technical field of preparation and application of super austenitic heat-resistant steel, and particularly relates to a method for regulating grain boundary boron redistribution and improving super austenite stainless steel grain boundary second phase precipitation. Background technique [0002] Super austenitic stainless steel is a high alloy steel stainless steel with high chromium, high nickel and high molybdenum content. It has excellent mechanical properties and corrosion resistance similar to nickel-based alloys. It is widely used in petrochemical, papermaking, metallurgy, chemical industry, Chemical and other fields, seawaterdesalination and other very harsh corrosive environments. However, high alloying additions make elements such as Mo and Cr easy to segregate during solidification and easily form hard and brittle phases. Since the size of the phase formed in the solidification stage is much larger than that form...
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