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Method for preparing inoculant for refining as-cast structure of spring steel and application method thereof

A technology of as-cast structure and application method, which is applied in the field of alloy steel, can solve the problems of unsatisfactory grain and structure refinement effect of spring steel, insufficient mechanical properties of spring steel, and insufficient dispersion of carbide particles.

Active Publication Date: 2012-08-01
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the as-cast structure of spring steel refined by block inoculants produced by existing conventional processes, the grains are still relatively coarse, the distribution of carbide particles in the matrix is ​​not sufficiently dispersed, and the mechanical properties of spring steel cannot be greatly improved. Because the grain size of its refiner is far from nanoscale, the refinement effect on spring steel matrix grain and structure is not ideal

Method used

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  • Method for preparing inoculant for refining as-cast structure of spring steel and application method thereof
  • Method for preparing inoculant for refining as-cast structure of spring steel and application method thereof
  • Method for preparing inoculant for refining as-cast structure of spring steel and application method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Step One, Ingredients

[0045] The required iron, vanadium, niobium and aluminum raw materials are weighed according to the molar ratio of Fe:V:Nb:Al=3.2:0.5:1.9:1.5.

[0046] The second step, melting

[0047] Mix the iron, vanadium, niobium and aluminum raw materials weighed in the first step into a vacuum melting furnace, make them melt and mix well and solidify into a FeVNbAl master alloy block;

[0048] The third step, centrifugal quick quenching

[0049] Weigh the required amount of FeVNbAl intermediate alloy blocks obtained in the second step, break them into small pieces, put them into the water-cooled copper crucible of the vacuum quenching furnace, and adjust the electrode position so that it is in the middle of the FeVNbAl in the crucible. The distance between the small alloy pieces is 0.5mm, close the furnace door, inlet and outlet and air release valve of the vacuum quenching furnace, and vacuumize until the vacuum pressure is higher than 5×10 -3 After Pa...

Embodiment 2

[0051] Step One, Ingredients

[0052] The required iron, vanadium, niobium and aluminum raw materials are weighed according to the molar ratio of Fe:V:Nb:Al=4.4:1.0:3.1:2.5.

[0053] The second step, melting

[0054] Mix the iron, vanadium, niobium and aluminum raw materials weighed in the first step into a vacuum melting furnace, make them melt and mix well and solidify into a FeVNbAl master alloy block;

[0055] The third step, centrifugal quick quenching

[0056] Weigh the required amount of FeVNbAl intermediate alloy blocks obtained in the second step, break them into small pieces, put them into the water-cooled copper crucible of the vacuum quenching furnace, and adjust the electrode position so that it is in the middle of the FeVNbAl in the crucible. The distance between the small alloy pieces is 1.0mm, close the furnace door, inlet and outlet and air release valve of the vacuum quenching furnace, and vacuumize until the vacuum pressure is higher than 5×10 -3 After Pa...

Embodiment 3

[0058] Step One, Ingredients

[0059] The required iron, vanadium, niobium and aluminum raw materials are weighed according to the molar ratio of Fe:V:Nb:Al=5.6:1.5:4.3:3.5.

[0060] The second step, melting

[0061] Mix the iron, vanadium, niobium and aluminum raw materials weighed in the first step into a vacuum melting furnace, make them melt and mix well and solidify into a FeVNbAl master alloy block;

[0062] The third step, centrifugal quick quenching

[0063] Weigh the required amount of FeVNbAl intermediate alloy blocks obtained in the second step, break them into small pieces, put them into the water-cooled copper crucible of the vacuum quenching furnace, and adjust the electrode position so that it is in the middle of the FeVNbAl in the crucible. The distance between the small alloy pieces is 1.5mm, close the furnace door, inlet and outlet and air release valve of the vacuum quick quenching furnace, and vacuumize until the vacuum pressure is higher than 5×10 -3 Af...

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Abstract

The invention discloses a method for preparing an inoculant for refining an as-cast structure of spring steel and an application method thereof, and relates to alloy steel. The preparation method comprises the following steps of: preparing materials in a molar ratio of Fe:V:Nb:Al of (3.2-5.6):(0.5-1.5):(1.9-4.3):(1.5-3.5), melting, and centrifuging and rapidly quenching and melt-spinning to obtain a flaky rapidly-solidified FeVNbAl intermediate alloy inoculant with the average thickness of between 0.1 and 0.3mm, the average width of between 1 and 2.5mm and the average length of between 3 and 8mm, namely the inoculant for refining the as-cast structure of the spring steel. The application method comprises a step of using the inoculant for refining the as-cast structure of the spring steel by a metal melt casting method. The inoculant has a remarkable effect of refining matrix grains and structures of the spring steel, so that the comprehensive mechanical properties and the service performance of a spring steel material are further improved.

Description

technical field [0001] The technical solution of the invention relates to alloy steel, specifically to the preparation method and application method of the inoculant used to refine the as-cast structure of spring steel. Background technique [0002] Spring steel refers to the steel used to make various springs. The spring uses its elastic deformation to absorb and release external force, so the spring steel is required to have a good elastic limit, good resistance to elastic decline and good yield-to-strength ratio. In order to prevent fatigue and fracture under alternating stress, the spring should have high fatigue strength and sufficiently high plasticity and toughness. In some specific environments, the spring is also required to have electrical conductivity, high temperature resistance and corrosion resistance. [0003] Spring steel requires higher strength and fatigue limit, and is generally used in the state of quenching + medium temperature tempering to obtain a hi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C35/00C22C33/04C22C33/06B22D27/20
Inventor 崔春翔孙继兵王铁宝刘双进戚玉敏方林王清周
Owner HEBEI UNIV OF TECH
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