Heat treatment method of promoting precipitation of nano-scale carbide in W-containing alloy steel

A heat treatment method and carbide technology, applied in the field of heat treatment to promote the precipitation of nano-carbides in W-containing alloy steel, can solve the problems of complex heat treatment process, complex alloy composition, low production efficiency, etc., and achieve improved solid solution strengthening and process The effect of simple process and improved production efficiency

A heat treatment method and carbide technology, applied in the field of heat treatment to promote the precipitation of nano-carbides in W-containing alloy steel, can solve the problems of complex heat treatment process, complex alloy composition, low production efficiency, etc., and achieve improved solid solution strengthening and process The effect of simple process and improved production efficiency

CN108754079AInactive Publication Date: 2018-11-06WUHAN UNIV OF SCI & TECH
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  • Heat treatment method of promoting precipitation of nano-scale carbide in W-containing alloy steel
  • Heat treatment method of promoting precipitation of nano-scale carbide in W-containing alloy steel
  • Heat treatment method of promoting precipitation of nano-scale carbide in W-containing alloy steel

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Embodiment 1

[0020] A heat treatment method for promoting the precipitation of nano-carbides in W-containing alloy steel. First, the steel billet is soaked at 1100-1150° C. for 36-48 hours, and then cooled to room temperature with the furnace. Then austenitize at 900-1000°C for 20-30min, and quench in ice-brine, the temperature of which is -3--1°C. Then at a vacuum of 10 -3 ~10 -2 Under the conditions of Pa and magnetic field strength of 10-13T, heat to 700-750°C at a rate of 3-7°C / min, hold the temperature for 0.5-2.5h, and cool to room temperature.

[0021] The chemical composition of the billet is: C is 0.06-0.12wt%, W is 1.50-2.50wt%, P<0.01wt%, S<0.005wt%, and the rest is Fe and unavoidable impurities.

[0022] figure 1 It is a transmission electron microscope image of nano-precipitation of W-containing alloy steel obtained by a kind of heat treatment method described in this embodiment, figure 2 It is the same as the rest except no strong magnetic field figure 1 The transmissio...

Embodiment 2

[0025] A heat treatment method for promoting the precipitation of nano-carbides in W-containing alloy steel. Firstly, the billet is soaked at 1150-1200° C. for 24-36 hours, and then cooled to room temperature with the furnace. Then austenitize at 850-950°C for 30-40min, and quench in ice-brine, the temperature of the ice-brine is -3--1°C. Then the vacuum is 10 -3 ~10 -2 Under the conditions of Pa and magnetic field strength of 11-14T, heat to 650-700°C at a rate of 3-7°C / min, hold the temperature for 1.0-3.0h, and cool to room temperature.

[0026] The chemical composition of the billet is: C is 0.08-0.14wt%, W is 2.00-3.00wt%, P<0.01wt%, S<0.005wt%, and the rest is Fe and unavoidable impurities.

[0027] image 3 It is a transmission electron microscope image of nano-precipitation of W-containing alloy steel obtained by a kind of heat treatment method described in this embodiment, Figure 4 It is the same as the rest except no strong magnetic field image 3 The transmiss...

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Abstract

The invention relates to a heat treatment method of promoting precipitation of nano-scale carbide in W-containing alloy steel. The heat treatment method is charaterized by comprising the following steps of soaking a steel billet for 24-48h under the condition with the temperature being 1100-1200 DEG C, and performing cooling along with a furnace to a room temperature; performing austenitizing for20-40min under the condition with the temperature being 850-1000 DEG C, and performing quenching in ice salt water; performing heating to 650-750 DEG C under the condition with the vacuum degree being10<-3>-10<-2>Pa and the magnetic field intensity being 10-14T and at a speed of 3-7 DEG C / min, keeping isothermy for 0.5-3.0h, and cooling to the room temperature, wherein the steel billet is prepared from the following chemical components: 0.06-0.14wt% of C, 1.50-3.00wt% of W, smaller than 0.01wt% of P, smaller than 0.005wt% of S and the balance of Fe and inevitable impurities, and the temperature of the ice salt water is 3 DEG C below zero to 1 DEG C below zero. The heat treatment method provided by the invention is simple in technology, low in cost and short in production period; and the strength of the W-containing alloy steel subjected to treatment with the method is obviously improved.

Description

technical field [0001] The invention belongs to the technical field of carbide precipitation in W-containing alloy steel. In particular, it relates to a heat treatment method for promoting the precipitation of nano-carbides in W-containing alloy steel. Background technique [0002] Ultra-high-strength steel is a steel material with ultra-high strength, high plasticity and good toughness obtained through alloying, heat treatment and cold and hot processing on the basis of alloy structural steel, which can significantly increase strength while maintaining good plasticity and toughness , its tensile strength ≥ 1500MPa (or yield strength ≥ 1380MPa). With the substantial improvement in the research level of steel materials, ultra-high-strength steel has become an important class of steel materials that are widely used, such as aircraft landing gear and tail shafts, bulletproof steel plates for armored vehicles, bogies for large machinery, and rocket engines. Some special fields...

Claims

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Application Information

Patent Timeline
06 Nov 2018
Publication
CN108754079A
IPC
C21D1/18; C21D1/04; C21D1/773; C22C38/12
CPC
C21D1/04; C21D1/18; C21D1/773; C22C38/12; C21D2211/005; C21D2211/004; C21D1/20; C22C38/002
Inventors
吴开明; 吴光辉