Hard alloy ultra-low temp. treatment process

A technology of ultra-low temperature treatment and hard alloy, applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problem of affecting the service life of bimetal saw bands, the failure of the teeth and the base material are not synchronized, and the teeth and the base material cannot be separated and other issues, to achieve significant economic and social benefits, improve labor productivity, and reduce residual stress

Inactive Publication Date: 2006-04-12
胡明
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The bimetal saw band is made of high-speed tool steel at the tooth part and high-strength hot-work alloy steel at the back material, which are welded by electron beams into a composite material, which is processed through multiple processes; due to the characteristics of the composite material, the two materials have different maximum Optimum quenching and tempering process parameters, the tooth part and the base material cannot be separated during heat treatment, and the potential of the two materials cannot be fully utilized, resulting in the problem of asynchronous failure of the tooth part and the base material, which affects the use of bimetallic saw bands life

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0028] Material:

[0029] Tooth part: high-cobalt high-speed steel Substrate: 35 chromium molybdenum nickel alum

[0030] Process:

[0031] 1. Quenching process:

[0032] Temperature: 1185°C

[0033] 2. Tempering process:

[0034] Temperature: 520℃ Time: 2h*3 times

[0035] 3. Cryogenic treatment process:

[0036] Cool to -120°C at a rate of 40°C / min, keep warm for 6h and then warm up to room temperature at the same rate.

[0037] 4. Tempering process:

[0038] Temperature: less than 500°C Time: 2h*1 time

example 2

[0040] Material:

[0041] Tooth part: high-cobalt high-speed steel Substrate: 35 chromium molybdenum nickel alum

[0042] Process:

[0043] 1. Quenching process:

[0044] Temperature: 1185°C

[0045] 2. Tempering process:

[0046] a: Temperature: 520°C

[0047] Time: 2h*2 times

[0048] b: Temperature: 550°C

[0049] Time: 2h*1 time

[0050] 3. Cryogenic treatment process:

[0051] Cool to -150°C at a rate of 50°C / min, keep warm for 60h and then warm up to room temperature at the same rate.

[0052] 4. Tempering process:

[0053] Temperature: less than 500°C Time: 1h*1 time

example 3

[0055] Material:

[0056] Tooth part: high-cobalt high-speed steel Substrate: 35 chromium molybdenum nickel alum

[0057] Process:

[0058] 1. Quenching process:

[0059] Temperature: 1185°C

[0060] 2. Tempering process:

[0061] Temperature: 530℃ Time: 2h*3 times

[0062] 3. Cryogenic treatment process:

[0063] Cool to -190°C at a rate of 60°C / min, keep warm for 50h and then warm up to room temperature at the same rate.

[0064] 4. Tempering process:

[0065] Temperature: less than 500°C Time: 2h*1 time

[0066] The bimetallic saw band treated by the above process is subjected to a rapid cutting test and a rapid fatigue test on GCr15 steel with a diameter of 65cm in the quenched and tempered state. Example 1, 2, and 3 correspond to test strips A, B, and C respectively, and the statistical results are the average value of 20 strips. The material to be cut is: GCr15 steel, diameter: 65cm, heat treatment process: quenching and tempering, hardness: HRC36~38)

[0067] ...

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Abstract

An ultralow-temp treating process for bimetal saw blade and hard alloy is composed of quenching, tempering, deep-cold treating and tempering steps. It can effectively improve the antiwear nature, and icnrease the impact and fatigue strength and toughness, and elongating service life.

Description

technical field [0001] The invention relates to a hard alloy ultra-low temperature treatment process. Background technique [0002] The bimetal saw band is made of high-speed tool steel at the tooth part and high-strength hot-work alloy steel at the back material, which are welded by electron beams into a composite material, which is processed through multiple processes; due to the characteristics of the composite material, the two materials have different maximum Optimum quenching and tempering process parameters, the tooth part and the base material cannot be separated during heat treatment, and the potential of the two materials cannot be fully utilized, resulting in the problem of asynchronous failure of the tooth part and the base material, which affects the use of bimetallic saw bands life. Cemented carbide is composed of a variety of superhard materials and binders through high temperature and high pressure. There must be some loose structures inside, which are fragi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D9/24
Inventor 刘良绅胡明曹骏明
Owner 胡明
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