Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Yttrium nitrate toughened high-hardness alloy and casting and heat treatment method thereof

A heat treatment method and technology of yttrium nitrate, which are applied in the preparation of wear-resistant and corrosion-resistant cast iron alloys and their components, and in the field of mechanical wear-resistant parts manufacturing, can solve the problems of low strength index, insufficient impact toughness, low bending strength, etc.

Inactive Publication Date: 2018-09-25
CENT SOUTH UNIV
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The hardness of this type of alloy is high, but the impact toughness is insufficient, the strength index is low, and the bending strength is low, in the range of 346-477MPa, which limits the application of this alloy to some occasions where the external load is large and impact resistance is required.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Yttrium nitrate toughened high-hardness alloy and casting and heat treatment method thereof
  • Yttrium nitrate toughened high-hardness alloy and casting and heat treatment method thereof
  • Yttrium nitrate toughened high-hardness alloy and casting and heat treatment method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Embodiment 1. After adopting iron powder and yttrium nitrate powder to mix uniformly, molded into powder briquettes. The weight ratio of yttrium nitrate powder to iron powder is about 1:3, that is to form Fe-yttrium nitrate mixed briquette with Fe-5.8wt.%Y. As the carrier of rare earth Y metamorphism.

[0046] High-carbon ferrochrome, micro-carbon ferrochrome, ferroboron, ferroniobium, ferrovanadium, industrial pure iron and the above-mentioned Fe-yttrium nitrate mixed briquettes are selected as raw materials, and the composition range is as follows: Cr: 10.0wt.%; B: 2.9wt .%; C: 0.7wt.%; Nb: 0.4wt.%; V: 0.2wt.%; Y: 1.0wt.%; Small amounts of impurities such as Al, Mn, N, etc. do not cause fundamental changes in alloy properties and are therefore not listed in Table 2.

[0047] After weighing the corresponding raw materials according to the composition requirements, induction melting and sand mold casting are adopted. The specific steps are:

[0048] Place the Fe-ytt...

Embodiment 2

[0052] Embodiment 2. After iron powder and yttrium nitrate powder are uniformly mixed, molded into a powder briquette. The weight ratio of yttrium nitrate powder to iron powder is about 1:9, that is to form Fe-yttrium nitrate mixed briquette with Fe-2.32wt.%Y. As the carrier of rare earth Y metamorphism.

[0053] Select high-carbon ferrochrome, metal chromium, ferroboron, ferroniobium, industrial pure iron and the above-mentioned Fe-Y 2 o 3 Mixed briquettes are used as raw materials, and the composition range is as follows: Cr: 10.0wt.%; B: 2.7wt.%; C: 0.7wt.%; Nb: 0.5wt.%; Y: 0.05wt.%; 2. Small amounts of impurities such as Al, Mn, N, etc. do not cause fundamental changes in alloy properties and are therefore not listed in Table 2.

[0054] After weighing the corresponding raw materials according to the composition requirements, the vacuum induction furnace can be used for melting and water-cooled iron mold casting. The specific steps are:

[0055] Place the Fe-yttrium ...

Embodiment 3

[0058] Embodiment 3. After iron powder and yttrium nitrate powder are uniformly mixed, molded into a powder briquette. The weight ratio of yttrium nitrate powder to iron powder is about 1:7, that is to form Fe-yttrium nitrate mixed compact of Fe-2.9wt.%Y. As the carrier of rare earth Y metamorphism.

[0059] Select high-carbon ferrochrome, micro-carbon ferrochrome, ferroboron, ferroniobium, industrial pure iron and the above-mentioned Fe-Y 2 o 3Mixed briquettes are used as raw materials, and the composition range is as follows: Cr: 10.0wt.%; B: 2.7wt.%; C: 0.8wt.%; Nb: 0.6wt.%; Y: 0.08wt.%. The control of impurity elements is shown in the table 2. Small amounts of impurities such as Al, Mn, N, etc. do not cause fundamental changes in alloy properties and are therefore not listed in Table 2.

[0060] After weighing the corresponding raw materials according to the composition requirements, induction melting and investment casting are adopted. The specific steps are:

[0061...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
microhardnessaaaaaaaaaa
microhardnessaaaaaaaaaa
melting pointaaaaaaaaaa
Login to View More

Abstract

The invention provides an yttrium nitrate toughened high-hardness alloy and a casting and heat treatment method thereof. The alloy is prepared from the following elements in percentage by mass: 9.0 to13.0 percent of Cr, 2.6 to 2.9 percent of B, 0.7 to 0.9 percent of C, 0.4 to 0.8 percent of Nb, 0.4 to 0.8 percent of V, less than 0.3 percent of Mn, 0.05 to 1.0 percent of Y, less than or equal to 0.01 percent of S, less than or equal to 0.01 percent of P and the balance of Fe, wherein the total sum of the C and the B is 3.3 to 3.6; the C / Cr mass ratio is 0.06 to 0.08; the total sum of the Nb and the V is 0.5 to 1.0. Firstly, prepared Fe-yttrium nitrate powder is pressed into a block, and materials of the alloy are prepared, melted and subjected to modification treatment and then are pouredinto the alloy; then the alloy is subjected to quenching-annealing treatment. According to the yttrium nitrate toughened high-hardness alloy, the whole hardness HRC of a casting ingot is 65.9 to 69.4,the impact toughness reaches 12.6 to 16.6 J / cm<2> and the bending strength reaches 1420 to 1750 MPa.

Description

technical field [0001] The invention belongs to the field of high-hardness wear-resistant cast iron, and relates to a wear-resistant and corrosion-resistant cast iron alloy and a component preparation method of a fine hard phase modified by yttrium nitrate, a supersaturated solid solution, and a martensitic matrix phase, and can be widely used in electric power , metallurgy, machinery, chemical and other industries in the manufacture of mechanical wear-resistant parts. technical background [0002] Fe-Cr-B-C wear-resistant casting alloy is mainly composed of Fe 2 B or M 2 B is a hard phase, which has good toughness, high hardness, high corrosion resistance, good smelting-casting processability, and has very broad application prospects. [0003] Modification treatment is one of the effective methods to improve the microstructure and mechanical properties of Fe-Cr-B-C alloy. Modifiers can be divided into strong carbon, nitrogen, and sulfide forming elements according to the...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/32C22C38/26C22C38/24C22C38/04C22C33/06C21D6/00C21D1/18
CPCC22C38/32C21D1/18C21D6/002C22C33/06C22C38/005C22C38/04C22C38/24C22C38/26
Inventor 罗丰华罗飞熊落保周海铭周浩钧曹军
Owner CENT SOUTH UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com