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Iron-based abrasion-resistant alloy containing superfine hard phase

A wear-resistant alloy, hard phase technology, used in welding media, metal processing equipment, welding/cutting media/materials, etc., can solve problems such as poor hardness and toughness matching, and easy cracking of surfacing alloys.

Inactive Publication Date: 2015-04-08
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In recent years, there have been considerable researches on iron-based wear-resistant surfacing alloys at home and abroad, but the surfacing alloys containing chromium carbide hard phase and boride-containing hard phase are easy to crack, and the matching of hardness and toughness is poor.

Method used

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  • Iron-based abrasion-resistant alloy containing superfine hard phase
  • Iron-based abrasion-resistant alloy containing superfine hard phase
  • Iron-based abrasion-resistant alloy containing superfine hard phase

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Example 1. An iron-based wear-resistant alloy powder containing ultra-fine hard phases, each element composition range is as follows: Cr: 15.5%; B: 2.7wt.%; C: 0.7%; W: 5.9%wt; Nb: 1.6wt.%; Mo: 3.4wt.%; V: 0wt.%; Mn: 2.0wt.%; Si: 1.1wt.%; Fe: balance. Plasma transfer arc spray welding is used for surfacing welding. The shielding gas, ion gas and powder feeding gas used in welding are all argon gas. The specific process parameters are: non-transferred arc voltage 18V; non-transferred arc current: 58A; transfer arc voltage: 29V ; Transfer arc current: 99A; powder feeding voltage: 4.5V; ion gas: 220L / h; powder feeding gas: 270L / h; shielding gas: 360L / h; spray welding speed: 25mm / min; welding gun swing: 25mm; Spray distance: 12mm.

Embodiment 2

[0022] Example 2. An iron-based wear-resistant alloy powder containing ultra-fine hard phases, each element composition range is as follows: Cr: 19.6wt.%; B: 3.8wt.%; C: 0.9%wt.%; W: 6.2 %wt; Nb: 3.8wt.%; Mo: 4.8wt.%; V: 0wt.%; Mn: 2.2wt.%; Si: 1.2wt.%; Fe: balance. Plasma transfer arc spray welding is used for surfacing welding. The shielding gas, ion gas and powder feeding gas used in welding are all argon gas. The specific process parameters are: non-transferred arc voltage 21V; non-transferred arc current: 62A; transfer arc voltage: 32V ; Transfer arc current: 105A; powder feeding voltage: 5.0V; ion gas: 240L / h; powder feeding gas: 300L / h; shielding gas: 400L / h; spray welding speed: 30mm / min; welding gun swing: 25mm; Spray distance: 13mm.

Embodiment 3

[0023] Example 3. An iron-based wear-resistant alloy powder containing ultra-fine hard phases, and the range of each element composition is as follows: Cr: 20wt.%; B: 4.4wt.%; C: 1.8%wt.%; W: 9.8% wt; Nb: 4.5wt.%; Mo: 6.0wt.%; V: 2.8wt.%; Mn: 2.4wt.%; Si: 1.5wt.%; Fe: balance. Plasma transfer arc spray welding is used for surfacing welding. The shielding gas, ion gas and powder feeding gas used in welding are all argon gas. The specific process parameters are: non-transferred arc voltage 21V; non-transferred arc current: 63A; transfer arc voltage 32V; Transfer arc current: 120A; powder feeding voltage: 5.5V; ion gas: 280L / h; powder feeding gas: 340L / h; shielding gas: 450L / h; spray welding speed: 30mm / min; welding gun swing: 30mm; spray Distance: 14mm.

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Abstract

The invention discloses iron-based abrasion-resistant alloy powder containing a superfine hard phase and belongs to the technical field of welding materials. The powder comprises 15.4-20wt.% of Cr, 2.3-4.8wt.% of B, 0.6-1.8wt.% of C, 5.9-9.8wt.% of W, 1.6-4.5wt.% Nb, 3.4-6.0wt.% of Mo, 0-2.8wt.% of V, 2.0-2.4wt.% of Mn, 1.1-1.5wt.% of Si and the balance Fe. The process for preparing a surfacing alloy comprises the steps of uniformly mixing high carbon ferro-chrome between 75 mu m and 150 mu m, chromium metal powder, ferroboron powder, metal tungsten powder, ferroniobium, ferromolybdenum, ferrovanadium, electrolytic manganese powder, ferrosilicon and metallic iron powder and preparing the surfacing alloy through plasma transferred arc spray welding. The prepared surfacing alloy contains the niobium-containing superfine complex hard phase, the dimension can be submicron, the alloy hardness can reach 68HRC, the alloy toughness is good, no crack is produced during welding, and the alloy has the good abrasion-resistance.

Description

Technical field [0001] The invention belongs to the technical field of welding materials, and relates to a preparation method of superfine hard phase wear-resistant surfacing alloy powders and surfacing alloys. It can be widely used for mechanical wear-resistant parts in electric power, metallurgy, machinery, chemical and other industries. Repair and manufacture. Background technique [0002] Abrasion is one of the main causes of mechanical failure, and abrasive wear accounts for more than 50%. In the development of modern industry and technology, mechanical equipment and its parts have higher and higher requirements for material wear resistance during use, and service life has increasingly become an important factor affecting the production efficiency of modern equipment. According to statistics, about 30% of the energy in developed countries in the world is consumed by wear in different forms. In recent years, my country consumes more than 3 million tons of metal wear-resistan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/30B23K10/00
Inventor 王智慧贺定勇赵雪飞蒋建敏周正李晓延崔丽万国力
Owner BEIJING UNIV OF TECH