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Boron-Chromium-rare earth co-infiltration process combined with pre-infiltration cold deformation for workpiece

A cold deformation and workpiece technology, which is applied in the field of boron-chromium-rare earth co-infiltration process, can solve the problems of restricting boronizing application and large size changes of workpieces, so as to reduce the brittleness of the infiltrated layer, improve the structure of the infiltrated layer, and improve the anti-wear performance Effect

Inactive Publication Date: 2006-12-13
SHANDONG JIANZHU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Boronizing and its subsequent heat treatment cause large changes in the size of the workpiece, which severely limits the application of boronizing on precision parts. Therefore, a lot of research and development of new processes, new methods and tools for processing boronizing parts are required.

Method used

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  • Boron-Chromium-rare earth co-infiltration process combined with pre-infiltration cold deformation for workpiece
  • Boron-Chromium-rare earth co-infiltration process combined with pre-infiltration cold deformation for workpiece
  • Boron-Chromium-rare earth co-infiltration process combined with pre-infiltration cold deformation for workpiece

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1: No. 45 steel sample was shot-peened for 1.5 hours and then co-infiltrated with boron-chromium-rare earth at 850° C. for 4 hours. After infiltration, the sample was observed and tested. The process is as follows:

[0029] 1. Shot blasting the workpiece

[0030] The Q3110A shot blasting machine is used, and the shot blasting time is 90 minutes. The steel shots are cast steel balls with a diameter of about 1.4mm, and the linear speed of the steel balls is 70m / s.

[0031] 2. Co-infiltration agent preparation

[0032] Copenetration agent is through L 18 (6 1 ×3 6 ) L 8 (4 1 ×2 4 ) Pan-selected and selected powdered boron-chromium-rare earth infiltration agent, powder or granular co-infiltration agent is mainly composed of industrial borax, high-carbon ferrochrome, rare earth, composite activator, reducing agent and graphite ; Its preparation process is as follows:

[0033] a. Grinding high-carbon ferrochrome, rare earth, and calcium-silicon alloy into 100...

Embodiment 2

[0042] Example 2: No. 45 steel sample was shot peened for 1 hour and then boron-chromium-rare earth co-infiltration was carried out under the condition of 850 ° C × 4h. The process is as follows:

[0043] 1. Shot blasting the workpiece

[0044] The Q3110A shot blasting machine is used, and the shot blasting time is 60 minutes. The steel shots are cast steel balls with a diameter of about 1.4mm, and the linear speed of the steel balls is 50m / s;

[0045] 2. Co-infiltration agent preparation

[0046] Copenetration agent is through L 18 (6 1 ×3 6 ) L 8 (4 1 ×2 4 ) Pan-selected and selected powdered boron-chromium-rare earth co-infiltration agent, powder or granular co-infiltration agent is mainly composed of industrial borax, high-carbon ferrochrome, rare earth, composite activator, reducing agent and graphite , its preparation process is as follows:

[0047] a. Grinding high-carbon ferrochromium, rare earth, silicon-calcium alloy into 90 meshes;

[0048] b. Grinding bora...

Embodiment 3

[0057] Example 3: The T8 steel sample was shot peened for 1.5 hours, and boron-chromium-rare earth co-infiltration was carried out under the condition of 850°C×4h, and the sample was observed and tested after infiltration. The process is as follows:

[0058] 1. Shot blasting the workpiece

[0059] The Q3110A shot blasting machine is used, and the shot blasting time is 90 minutes. The steel shots are cast steel balls with a diameter of about 1.4mm, and the linear speed of the steel balls is 70m / s;

[0060] 2. Co-infiltration agent preparation

[0061] Copenetration agent is through L 18 (6 1 ×3 6 ) L 8 (4 1 ×2 4 ) Pan-selected and selected powdered boron-chromium-rare earth co-infiltration agent, powder or granular co-infiltration agent is mainly composed of industrial borax, high-carbon ferrochrome, rare earth, composite activator, reducing agent and graphite ; Its preparation process is as follows:

[0062] a. Grinding high-carbon ferrochrome, rare earth, and calcium...

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Abstract

The invention relates to a cold deformation boron - chromium -rare earth coinfiltration process before the work infiltration, which includes performing cloudburst treatment for the work, then adding aquacare and amchlor into the prepared boron - chromium -rare earth coinfiltration agent, evenly mixing and loading into infiltration box, performing rust and grease removal for the work surface after the cloudburst treatment, protecting impervious position with carbite or asbest cord, filling coinfiltration agent on the substratum and top of the infiltration box, embedding the work in the infiltration box filled with powder or granular coinfiltration agent, in which the distance between the work and the box wall should be farther than 30mm; packing the infiltration box with double sodium silicate mastic, then drying at 90-110 DEG C; then heating-up to 840-860 DEG C, filling into heater when reaching the needed temperature and preserving heat for 3.8-4.2 hours, afterwards getting from the furnace to cool, finally performing heat hardening and lonnealing treatment to the work. By this process, the infiltration structure can be improved and the infiltration brittleness can be reduced in the precondition of no reduction of the infiltration layer rigidity, and the attrition resistance of the infiltration layer can also be improved.

Description

technical field [0001] The invention relates to a deformation chemical heat treatment process, in particular to a boron-chromium-rare earth co-infiltration process for cold deformation of workpieces before infiltration. Background technique [0002] Boronizing is a new type of heat treatment process developed in modern times. It generally refers to the heat treatment process of infiltrating boron into iron and steel materials to obtain iron borides. After boronizing, the surface of the steel has high hardness (up to 1300-2100HV) and wear resistance, good corrosion resistance, oxidation resistance and thermal hardness. This process has gradually become a widely used surface diffusion and infiltration treatment process, and its applications in petrochemical machinery, automobile and tractor manufacturing, textile machinery, tooling and molds are increasing day by day. The materials suitable for boronizing are also very extensive. Almost all steel materials, such as structural...

Claims

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Application Information

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IPC IPC(8): C23F17/00C23C10/54C21D1/18C21D7/06
Inventor 许斌宋月鹏冯承明邢士波李木森杨乐
Owner SHANDONG JIANZHU UNIV
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