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Technology for testing pearlite in low carbon steel structure in mesophase spheroidizing annealing

A pearlitic and low carbon steel technology, applied in the direction of manufacturing tools, heat treatment equipment, heat treatment process control, etc., can solve the problems of wasting materials and time-consuming, and achieve the effect of improving production efficiency, high economic value, and reducing time

Active Publication Date: 2011-10-26
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

As a result, it takes a lot of time and a lot of waste of materials to determine the process plan of a certain steel grade.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0033] The specific implementation method is:

[0034] The above-mentioned heating stage, heat preservation stage, and cooling stage require specific experiments to determine the three process parameters of heating temperature, heat preservation time, and cooling speed.

[0035] Determination of heating temperature:

[0036] It can be predetermined to heat the tissue to the fully austenitic temperature (Ac 3 ) and pearlite transition temperature (Ac 1 ) at a certain temperature; when the sample is heated to this temperature, the sample is immediately taken out and quenched, and then the metallographic preparation is carried out for microstructure observation, mainly to observe the fracture distribution of carbide particles on the martensite matrix, according to Relatively good tissue to determine the best heating temperature T.

[0037] Determination of holding time:

[0038] According to the previous experiment, the best heating temperature T was determined, and several d...

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Abstract

The invention discloses a technology for testing a pearlite in a low carbon steel structure in mesophase spheroidizing annealing, wherein, the technology comprises the following stages, a heating stage: heating a sample of the low carbon steel to a test temperature between a complete austenitic temperature Ac3 and a pearlite transition temperature Ac1; an insulation stage: maintaining for a certain insulation time according to the test temperature; a cooling stage: precipitating and depositing a carbide on a fine carbide core through the proper cooling temperature, finally forming carbide particles shaped in a similar to a spherical shape for achieving the effect of spheroidizing pearlite. According to the technical schemes, a plurality of intersect tests for determining process parameters can be avoided, and the frequencies and the time of tests can be also reduced; the structural and mechanical properties can be improved, the production efficiency can be improved as well as energy consumption can be reduced, the technology provided in the invention has high economic values in the production process.

Description

technical field [0001] The invention belongs to the technical field of metal material analysis and testing, and relates to a heat treatment technology for improving the structure and performance of metal materials. More specifically, the invention relates to a test process for pearlite in mesophase annealing and spheroidizing medium and low carbon steel structures. Background technique [0002] The traditional spheroidizing pearlite process uses the mechanism of diffusion spheroidization to change the pearlite shape, which takes a long time and a long test period. [0003] In recent years, the new spheroidization process using the "separation eutectoid" mechanism is an important direction for the development of the spheroidization heat treatment process in the future. Compared with the traditional spheroidization process, it has the characteristics of short cycle and low energy consumption. [0004] The spheroidization process using the "divorce eutectoid" mechanism requires...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/32C21D11/00
Inventor 金宝安
Owner MAANSHAN IRON & STEEL CO LTD
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