CN103114247B - High-hardness high-toughness wear-resistant steel and preparation method thereof - Google Patents

Abstract

The invention discloses a high-hardness high-toughness wear-resistant steel which is characterized by comprising the following components in percentage by weight: 1-1.5% of C, 0.2-0.5% of Si, 10-12% of Mn, 1.3-1.5% of Cr, 0.1-0.3% of V, 0.05-0.2% of Ti and the balance of Fe. The steel is of a stable austenite structure and can reach the technical indexes of high hardness and high wear resistance in an impact state.

Description

A kind of high hardness high ductility wear-resistant steel and preparation method thereof

Technical field

The present invention relates to a kind of wear resisting steel, particularly relate to a kind of high hardness high ductility wear-resistant steel and preparation method thereof

Background technology

High mangaenese steel becomes a widely used class wear resisting steel because having the work hardening ability of certain intensity, high toughness and excellence.High mangaenese steel includes Mnl3, Mnl7 and Mn25 series wear resisting steel, and Medium Manganese Steel typically refers to Mn7 series wear resisting steel.Wherein Mn13 series wear resisting steel be history at most, most widely used wear resisting steel.

Although high mangaenese steel is still industrially widely used, but user recognizes the limitation of high mangaenese steel gradually, and be progressively improved to strengthening high mangaenese steel, at present, high mangaenese steel could need play work hardening effect well under large ballistic work condition, and high mangaenese steel failure mode is various, and the work hardening layer fragility on surface is larger, easy to crack and peel off, range of application is restricted; Rich chromium cast iron hardness is higher, have excellent wear resistance, but production cost is high, easily produces high-temperature heat treatment strain cracking, not easily uses on complex structure or large-size ball mill; Therefore high mangaenese steel is after certain treatment process, and its over-all properties reaches service requirements, will become the developing direction of ball grinding machine lining board.

201010173583 have applied for a kind of high mangaenese steel, and its manganese, chromium content, far above the present invention, are Mn18 type, and add noble metal molybdenum, nickel.

Summary of the invention

The present invention studies mainly for the optimizing components of lining material, and by adding, difference measures rare earth, the composition of vanadium titanium to lining material (high mangaenese steel) is optimized smelting, thus reduces Carbide Precipitation amount; Control the precipitation form of carbide; And the technical indicator of high rigidity height wearing and tearing is reached by crystal grain thinning, strengthening stable austenite.

The present invention is a kind of high hardness high ductility wear-resistant steel, it is characterized in that its weight percent consists of: C is 1-1.5%, Si is 0.2-0.5%, Mn is 10-12%, Cr be 1.3-1.5%, V is 0.1-0.3%, Ti is 0.05-0.2%, RE<0.1%, and surplus is Fe.

It is characterized in that its weight percent consists of: C is 1.17%, Si be 0.33%, Mn be 10.8%, Cr be 1.46%, V be 0.23%, Ti is 0.075%, RE<0.1%, and surplus is Fe.

It is characterized in that its weight percent consists of: C is 1.34%, Si be 0.43%, Mn be 11.2%, Cr be 1.34%, V be 0.14%, Ti is 0.145%, RE<0.1%, and surplus is Fe.

It is characterized in that its weight percent consists of: C is 1.11%, Si be 0.23%, Mn be 10.8%, Cr be 1.41%, V be 0.18%, Ti is 0.2%, RE<0.1%, and surplus is Fe.

It is characterized in that, Rockwell hardness is 24-27HRC, and impelling strength is 150-200J.

The first step: alloy melting, controls its composition in the scope as described in claim 1-5;

Second step: alloy is poured into a mould, controlled cooling model speed in casting process, avoids cracking;

3rd step: alloy solid solution process, because there being alloy carbide to exist, the solid solubility temperature of employing is 1080 DEG C-1100 DEG C, in heat-processed, 400 DEG C of preheating 60min, 720 DEG C of preheating 60min; High mangaenese steel thermal conductivity is lower, and material deformation is avoided in the measure adopting preheating.

4th step: adopt cooling by water, ensure enough water yields, avoid speed of cooling inadequate; In scale operation, if batch is large, water temperature in process of cooling can be caused to rise, and the cooling power of water declines, and can not obtain austenite structure completely, affect the performance of high mangaenese steel.

The present invention has following advantage:

(1) their better economy, the element adopted can be easier to obtain, and cost is lower.

(2) program is reasonably arranged in pairs or groups vanadium, titanium alloy element, its durometer properties vanadium of more not arranging in pairs or groups, titanium alloy element add 10HRC, toughness comparatively basic pattern improve 40J, wear resisting property improves 20%.Compared with current lining material production decision, lining material all more traditional in performance is more optimized, and exploitativeness is aborning very strong.

(3) by Electronic Speculum and energy spectrum analysis to after after starting material and optimizing components, material carries out sample checking, adding of Shao Liangfan, titanium, can form the compounds such as TiC and VC, the austenite formed not only increases the hardness of material, and ensure that the toughness of material.

One, material hardness

Measure material Rockwell hardness, hardness counts TH550 type Rockwell hardometer, the instrument that testing standard adopts for GB/T230.1-2004(and model, the national standard of sampling and test).

Two, impact toughness test

Adopt Charpy impact machine tester, shock-testing machine model JBNS-300, adopt GB/T229-2007 to measure.(instrument adopted and model, the national standard of sampling and test).

Three, wear resistance measures

Adopt toward end face frictional wear experimental machine test wear resistance, trier model MMU-10G, this experiment is simultaneous test, experiment material is processed into the sample of same geomery, another kind of high hardness material is processed into mill sample, carry out, to mill test, judging the wear resisting property of material according to the size of weight loss under same condition (load, time).(instrument adopted and model, the national standard of sampling and test).

Four, scanning electron microscope analysis

Utilize in scanning electron microscope analysis material and organize.

Accompanying drawing illustrates:

Fig. 1 is the Electronic Speculum figure of embodiment 1;

Fig. 2 is the Electronic Speculum figure of embodiment 2;

Fig. 3 is the Electronic Speculum figure of embodiment 3;

Embodiment

Below in conjunction with specific embodiment to invention has been further description.

Embodiment 1

A kind of high hardness high ductility wear-resistant steel, its weight percent consists of: C is 1.17%, Si be 0.33%, Mn is 10.8%, Cr is 1.46%, V be 0.23%, Ti is 0.075%, RE<0.1%, and surplus is Fe.

Embodiment 2

A kind of high hardness high ductility wear-resistant steel, its weight percent consists of: C is 1.34%, Si be 0.43%, Mn be 11.2%, Cr be 1.34%, V be 0.14%, Ti is 0.145%, RE<0.1%, and surplus is Fe.

Embodiment 3

A kind of high hardness high ductility wear-resistant steel, its weight percent consists of: C is 1.11%, Si be 0.23%, Mn be 10.8%, Cr be 1.41%, V be 0.18%, Ti is 0.2%, RE<0.1%, and surplus is Fe.

The solder alloy of embodiment 1-3 carries out temperature of fusion and carries out assessment result in table 2

The specific performance parameter of table 1 embodiment 1-3

Wearing test adopts Cr12MoV sample to mill, load 200N, time 120min.

From the electromicroscopic photograph display Fig. 1-3, material has obviously martensitic stucture feature, shows that material internal creates deformation induced martensite, make steel have very high hardness, improve the wear resistance of steel, but heart portion still has high toughness.But this strain induced martensite just creates at sample preparation, greater impact power ability strain induced martensite is needed to have more excellent performance compared with traditional high mangaenese steel.

Certainly; the above is only one embodiment of the present invention; should be understood that those skilled in the art; under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications all belong within the protection domain of the claims in the present invention.

Claims (2)

1. a high hardness high ductility wear-resistant steel, it is characterized in that its weight percent consists of: C is 1.11%, Si is 0.23%, Mn be 10.8%, Cr is 1.41%, V is 0.18%, Ti is 0.2%, RE<0.1%, and surplus is Fe, its Rockwell hardness is 26HRC, and impelling strength is 197.6J.

2. prepare a method for high hardness high ductility wear-resistant steel as claimed in claim 1, it is characterized in that the method is realized by following steps:

The first step: alloy melting, controls its composition in scope as claimed in claim 1;

Second step: alloy is poured into a mould, controlled cooling model speed in casting process, avoids cracking;

3rd step: alloy solid solution process, because there being alloy carbide to exist, the solid solubility temperature of employing is 1080 DEG C-1100 DEG C, in heat-processed, 400 DEG C of preheating 60min, 720 DEG C of preheating 60min;

4th step: adopt cooling by water.