Preparation method of micro/nano-structure ultrahigh-strength plastic stainless steel containing Nb

An ultra-high-strength, nano-structure technology, applied in the field of preparation of micro/nano composite structure ultra-high-strength plastic stainless steel, can solve the problems of poor mechanical stability, poor biocompatibility, low strength, etc.

Active Publication Date: 2013-03-27
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention provides a method for producing ultra-high-strength plastic stainless steel with a micro/nano composite structure containing Nb, especially

Method used

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  • Preparation method of micro/nano-structure ultrahigh-strength plastic stainless steel containing Nb
  • Preparation method of micro/nano-structure ultrahigh-strength plastic stainless steel containing Nb
  • Preparation method of micro/nano-structure ultrahigh-strength plastic stainless steel containing Nb

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Experimental program
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Effect test

Embodiment 1

[0030] The chemical composition is calculated by weight percentage, C0.017%; Si0.5%; Mn1.3%; Cr17.5%; Mo2.5%; Ni12%; N0.09%; Nb0.05%. According to the decarburization situation in the smelting process, graphite is properly added, and the sample steel ingot is obtained by smelting in a 50kg vacuum furnace according to the corresponding proportion. Cut the smelted billet, cut off the riser, and forge it into the required billet. The forging plan is: heat the billet to 1250°C, keep it warm for 2 hours and then forge it out of the furnace. The final forging temperature is not lower than 1100°C, forging to 20mm A steel ingot with thickness × 150mm width × 200mm length. Carry out soaking treatment on the blank, control the temperature of the blank to 1250°C, and keep it warm for 200 minutes, so that the microalloying elements in the steel can fully remelt. Descaling is carried out on the slab after it comes out of the furnace to remove the iron oxide scale produced during the heati...

Embodiment 2

[0034] The chemical composition is calculated by weight percentage, C0.017%; Si0.5%; Mn1.3%; Cr17.5%; Mo2.5%; Ni12%; N0.09%; Nb0.05%. According to the decarburization situation in the smelting process, graphite is properly added, and the sample steel ingot is obtained by smelting in a 50kg vacuum furnace according to the corresponding proportion. Cut the smelted billet, cut off the riser, and forge it into the required billet. The forging plan is: heat the billet to 1250°C, keep it warm for 2 hours and then forge it out of the furnace. The final forging temperature is not lower than 1100°C, forging to 20mm A steel ingot with thickness × 150mm width × 200mm length. Carry out soaking treatment on the blank, control the temperature of the blank to 1250°C, and keep it warm for 200 minutes, so that the microalloying elements in the steel can fully remelt. Descaling is carried out on the slab after it comes out of the furnace to remove the iron oxide scale produced during the heati...

Embodiment 3

[0037] The chemical composition is calculated by weight percentage, C0.017%; Si0.5%; Mn1.3%; Cr17.5%; Mo2.5%; Ni12%; N0.09%; Nb0.05%. According to the decarburization situation in the smelting process, graphite is properly added, and the sample steel ingot is obtained by smelting in a 50kg vacuum furnace according to the corresponding proportion. Cut the smelted billet, cut off the riser, and forge it into the required billet. The forging plan is: heat the billet to 1250°C, keep it warm for 2 hours and then forge it out of the furnace. The final forging temperature is not lower than 1100°C, forging to 20mm A steel ingot with thickness × 150mm width × 200mm length. Carry out soaking treatment on the blank, control the temperature of the blank to 1250°C, and keep it warm for 200 minutes, so that the microalloying elements in the steel can fully remelt. Descaling is carried out on the slab after it comes out of the furnace to remove the iron oxide scale produced during the heati...

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Abstract

The invention belongs to the field of production of ultrahigh-strength plastic alloy steel, and relates to a preparation method of micro/nano-structure ultrahigh-strength plastic stainless steel containing Nb. The preparation method comprises the steps of: firstly preparing materials according to a composition proportion, adding 0.05-0.15% of Nb element on the basis of 316L austenitic stainless steel, then carrying out vacuum induction furnace smelting, casting blank forging, forged piece hot rolling and solution treatment, carrying out cold deformation on the steel plate which undergoes the solution treatment with deformations of 40%, 60%, 80% and 90% and with single reduction in pass controlled within 3-10% to prepare steel plate with different cold deformations, annealing the steel plate which undergoes the cold deformation with heating rate controlled at 50-200 DEG C/s, with heating temperature within 750-950 DEG C and with heat preservation time within 5-100s, and cooling to the room temperature at a cooling rate of 50-400 DEG C/s to obtain a superfine austenite structure with micro-nano scale. The obdurability of the material is synchronously improved. The yield strength of the final product can be up to 750-800MPa, the strength of extension is up to 1100-1200MPa and the percentage of elongation is 35-45%.

Description

technical field [0001] The invention belongs to the field of ultra-high-strength plastic alloy steel production and relates to a preparation method of ultra-high-strength plastic stainless steel with Nb-containing micron / nano composite structure. Background technique [0002] As commonly used biomedical bone materials, although calcium phosphate and bioactive glass can promote the formation of bone tissue, due to the low strength of these materials, the bending strength is only in the range of 42-200MPa, and they are fragile, so their application is also restricted. limit. Austenitic stainless steel has been widely used in artificial joints and other biomedical materials due to its non-magnetic properties, corrosion resistance, easy forming and good mechanical properties. But the fly in the ointment is that its biocompatibility is still significantly inferior to calcium phosphate and bioactive glass. In recent years, Professor Misra of Louisiana State University in the Uni...

Claims

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Application Information

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IPC IPC(8): C22C38/48C21D8/02
Inventor 武会宾武凤娟唐荻孙蓟泉梁国俐李旭
Owner UNIV OF SCI & TECH BEIJING
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