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Boride-containing austenit - bainite abrasion resistant alloy and preparation method thereof

A wear-resistant alloy and austenite technology, applied in the field of steel preparation, can solve the problems of low hardness and insufficient wear resistance, and achieve the effects of overcoming large brittleness, wide sources and low production costs

Active Publication Date: 2015-07-08
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, high-silicon cast steel still has low hardness and insufficient wear resistance when used under impact abrasive wear conditions.

Method used

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  • Boride-containing austenit - bainite abrasion resistant alloy and preparation method thereof
  • Boride-containing austenit - bainite abrasion resistant alloy and preparation method thereof
  • Boride-containing austenit - bainite abrasion resistant alloy and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023]The chemical composition is 0.57wt% C, 0.09wt% B, 2.38wt% Si, 0.78wt% Mn, 1.46wt% Cr, 0.33wt% Mo, 0.011wt% P, 0.007wt% S, 0.15wt% Ti, 0.08wt% %Ce. After austenitizing at 950°C for 0.5 hours, the test block is directly subjected to isothermal quenching in an isothermal salt bath at a temperature of 250°C for 0.5 hours, then taken out and air-cooled to room temperature, and then washed with water to clean the salt on the surface. Obtained boride-containing austenitic-bainitic wear-resistant alloys (see figure 1 ) mechanical properties and wear resistance are as follows: the hardness is 58HRC, and the impact energy of a wire-cut 10mm×10mm×55mm standard sample is A k It is 5.5J, and the tensile strength is 690MPa. The ball-on-disk test is carried out on the Falex multifunctional friction and wear testing machine (the grinding material is zirconia ceramic ball, the pressure is 10 pounds), and the wear loss is 7.69mg.

Embodiment 2

[0025] The chemical composition is: 0.54wt% C, 0.47wt% B, 2.36wt% Si, 0.87wt% Mn, 1.43wt% Cr, 0.32wt% Mo, 0.012wt% P, 0.009wt% S, 0.19wt% Ti, 0.07 wt% Ce. After the test block was austenitized at 950°C for 0.5 hours, it was directly quenched in an isothermal salt bath at a temperature of 400°C for 0.5 hours, then it was taken out and air-cooled to room temperature, and the salt on the surface was cleaned with water. The mechanical properties and wear resistance of the obtained boride-containing austenite-bainite wear-resistant alloy are as follows: the hardness is 47HRC, and the impact energy of the wire-cut 10mm×10mm×55mm standard sample is A k It is 7.5J, and the tensile strength is 910MPa. The ball-on-disk test is carried out on the Falex multifunctional friction and wear testing machine (the grinding material is zirconia ceramic ball, the pressure is 10 pounds), and the wear loss is 6.77mg.

Embodiment 3

[0027] The chemical composition is 0.64wt% C, 0.27wt% B, 2.34wt% Si, 0.85wt% Mn, 1.47wt% Cr, 0.32wt% Mo, 0.012wt% P, 0.010wt% S, 0.17wt% Ti, 0.12wt% %Ce. After austenitizing at 950°C for 0.5 hours, the test block was directly quenched in an isothermal salt bath at a temperature of 300°C for 0.5 hours, then it was taken out and air-cooled to room temperature, and the salt on the surface was cleaned with water. The mechanical properties and wear resistance of the boride-containing austenite-bainite wear-resistant alloy obtained are as follows: the hardness is 53HRC, and the impact energy of a wire-cut 10mm×10mm×55mm standard sample is A k It is 7.0J, and the tensile strength is 780MPa. The ball-on-disk test is carried out on the Falex multifunctional friction and wear testing machine (the grinding material is zirconia ceramic ball, the pressure is 10 pounds), and the abrasion loss is 5.58mg.

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Abstract

The invention belongs to the technical field of iron and steel material preparation, and relates to a boride-containing austenit - bainite alloy and a preparation method thereof. In the present invention, the boride is used as an abrasion resistant hard phase, and a carbide-free bainite and austenite duplex structure is used as a matrix, wherein respective control of number of abrasion resistant phase and the carbon content of the matrix can be achieved via djustment of contents of boron and carbon, andmechanical properties of the matrix can be controlled and adjusted via the reasonable control of austempering heat treatment. The mechanical properties of the alloy are as follows: hardness 45-63HRC, tensile strength 650 ~ 950MPa, impact toughness 4 ~ 15J, and abrasion performance being 1 to 1.8 times that of high-chromium white cast iron under the same experimental conditions.

Description

technical field [0001] The invention belongs to the technical field of iron and steel preparation, and in particular relates to a boride-containing austenite-bainite wear-resistant alloy and a preparation method thereof. Background technique [0002] In the pursuit of high-hardness iron-based wear-resistant materials, white cast iron is a commonly used wear-resistant material. Its development has gone through three stages: ordinary white cast iron, nickel hard white cast iron and high-chromium white cast iron. Unique advantages in abrasive conditions. The earliest application of ordinary white cast iron, the composition does not contain or only a small amount of alloying elements, the metallographic structure consists of pearlite and M 3 Composed of C-type eutectic carbide, it has the disadvantages of low hardness and poor toughness. The emergence of nickel-hard white cast iron solves the hardness problem of ordinary white cast iron, so that the matrix can be transformed i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/14C22C38/58C22C38/34C21D1/20
Inventor 陈祥李言祥
Owner TSINGHUA UNIV