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Layered composite tissue shaft parts material and its preparation method

A technology of composite structure and shaft parts, applied in the direction of shaft, temperature control, shaft and bearing, etc., can solve the problems of rolling holes and porosity, and achieve the effect of good impact resistance

Active Publication Date: 2012-04-25
江苏信众企业管理有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, for the rolling of medium-high carbon and low-alloy steel, the rolling temperature in actual production is mostly 1000~1200 ℃, and the necessary heat treatment after rolling can meet the service conditions of shaft parts, and the rolled parts are prone to rolling defects during the rolling process. Holes, porosity and other defects

Method used

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  • Layered composite tissue shaft parts material and its preparation method
  • Layered composite tissue shaft parts material and its preparation method
  • Layered composite tissue shaft parts material and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Example 1: The chemical composition is C 0.50 wt%, Si 0.37 wt%, Mn 0.80 wt%, Cr 0.4 wt%, Ni 0.30 wt%, Pfigure 1 ; figure 2 Metallographic photograph of flaky pearlite and proeutectoid ferrite in the center; image 3 It is a composite structure of micron-sized ferrite and fine cementite particles in the outer layer.

Embodiment 2

[0012] Example 2: The chemical composition is C 0.40 wt %, Si 0.25 wt %, Mn 0.75 wt %, Cr 1.05 wt %, Mo 0.20 wt %, P2 ) greater than 45.

Embodiment 3

[0013] Example 3: A medium-carbon low-alloy steel whose chemical composition is C 0.95 wt %, Si 0.21 wt %, Mn 0.30 wt %, Cr 1.2 wt %, P<0.03 wt %, S<0.02 wt %, and the balance is Fe φ60 bar, heated to the rolling temperature of 1050 °C, took out the bar, put it into 20 °C water for 5 s and quickly took it out, at this time the surface temperature of the rolled billet bar was about 600 °C, and the core was still 1050 °C ℃, carry out cross rolling forming, the average reduction is about 20%, after forming, air cool for 15s and then oil cool to room temperature. During the forming process, due to the presence of a low-temperature hard shell on the surface of the bar, the stress conditions during the rolling process of the rolled piece are changed, and there are no defects such as rolling looseness in the center of the rolled piece. It is thin, and obviously different from the core structure, with obvious structure layering characteristics. The core is pearlite and bainite structu...

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Abstract

The invention relates to a layered composite tissue shaft parts material and its preparation method, which is characterized in that the material is a medium-high carbon low-alloy steel which contains 0.40-1.5wt% of C and the sum of other alloy content less than 5wt% in the chemical composition; the material has more than two layers of composite tissue, the external layer enables high strength andhardness, the internal layer has good shock resistance. The preparation method comprises the following steps that a blank material is heated to the rolling temperature, and treated to a rolling blankmaterial with low temperature of the external layer and high temperature of the core part, wherein the rolling blank surface layer temperature is required at the 300 DEG C below the A1 temperature, the temperature of the core part is still the rolling temperature, one-pass skew rolling or cross wedge rolling is carried out. The invention has the advantages that the shaft parts material has layered composite tissue, the certain performance difference is existed between the external layer and the internal layer, the external layer has high strength and hardness, the internal layer has good shock resistance, heat treatment and a lot of cutting processes are not required after the material is shaped, the shaft parts material of the invention is adapted to production of shaft parts and motor shaft parts of automobile, engine and mechanical structure.

Description

technical field [0001] The invention relates to a shaft part material with a layered composite structure and a preparation method thereof, belonging to the field of metallurgical materials. Background technique [0002] Medium-high-carbon low-alloy steel shafts are widely used in industry, and most shafts are produced by processing rolled materials and then performing corresponding heat treatment to meet the performance of shaft parts. The cross-wedge rolling or cross-wedge rolling technology can directly roll the billet into the final or near-final size of the shaft, and it has the characteristics of saving raw materials and high production efficiency. At present, for the rolling of medium-high carbon and low-alloy steel, the rolling temperature in actual production is mostly 1000~1200 ℃, and the necessary heat treatment after rolling can meet the service conditions of shaft parts, and the rolled parts are prone to rolling defects during the rolling process. Holes, porosit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16C3/02B21B1/16B21B37/74
Inventor 吕知清仇平肖宏傅万堂
Owner 江苏信众企业管理有限公司
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