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Method for carrying out stress relaxation test on Gleeble3800 hydraulic wedge unit in Jaw control mode

A stress relaxation and control mode technology, applied in the field of thermal simulation test, can solve the problems of difficult to observe the precipitation platform, high price, poor accuracy, etc., to achieve the effect of low cost, cost saving and improved accuracy

Inactive Publication Date: 2010-08-04
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the stress relaxation test on the ordinary unit needs to be processed separately or the corresponding indenter and wedge-shaped fixture must be purchased, which is expensive
Although the hydraulic wedge unit has corresponding indenters and fixtures, since the control program is an HDS file, only the Stroke control mode can be used for compression, so the precision is poor, and it is not easy to observe the precipitation platform

Method used

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  • Method for carrying out stress relaxation test on Gleeble3800 hydraulic wedge unit in Jaw control mode
  • Method for carrying out stress relaxation test on Gleeble3800 hydraulic wedge unit in Jaw control mode
  • Method for carrying out stress relaxation test on Gleeble3800 hydraulic wedge unit in Jaw control mode

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Embodiment 1

[0024] A method for performing stress relaxation tests on a Gleeble 3800 hydraulic wedge unit using the Jaw control mode, where the stress relaxation test is performed directly on the hydraulic wedge unit. The material selected in this embodiment is Q550D, the deformation amount is 0.2e, and the deformation speed is 0.1e / s. Specifically include the following steps:

[0025] 1) Weld the thermocouple to the sample, use the K-type thermocouple when the sample heating temperature is below 1200°C, and use the S-type thermocouple above 1250°C;

[0026] 2) Apply lubricant to the indenter and the sample to reduce the friction during compression, and use tantalum sheets to isolate the indenter and the sample to prevent the reaction between the indenter and the sample under high temperature conditions;

[0027] 3) Turn on the air hammer, compress the sample, and control the stress at about 100Kg, then turn on the Gleeble3800 thermal simulation testing machine, and move the indenter to ...

Embodiment 2

[0037] Yet another method of performing stress relaxation test on Gleeble3800 hydraulic wedge unit with Jaw control mode, the stress relaxation test is directly performed on the hydraulic wedge unit. The material selected in this embodiment is E36-T, the deformation amount is 0.2e, and the deformation speed is 0.1e / s. Concrete steps are identical with embodiment 1.

[0038] The measured stress relaxation is as Figure 5 shown. Through the stress relaxation test, it can be seen that the start time of precipitation at 800-900°C is within 10s, and the end time is also within 100s. 20s, the precipitation can play a very good role in inhibiting recrystallization, but as time goes by, the insufficient precipitation leads to the weakening of the effect of inhibiting recrystallization, which completely corresponds to the results of the softening fraction of the double-pass compression test, again It is entirely possible to illustrate the curves for this test stress relaxation. Fi...

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Abstract

The invention discloses a method for carrying out a stress relaxation test on a Gleeble3800 hydraulic wedge unit in a Jaw control mode, which comprises the following steps: welding a thermocouple onto a sample, adopting a K-shaped thermocouple when the heating temperature of the sample is below 1200 DEG C, and adopting an S-shaped thermocouple when the heating temperature of the sample is above 1250 DEG C; respectively spreading a lubricant on a pressure head and the sample to reduce the friction force in compression, and isolating the pressure head and the sample through a tantalum sheet to prevent the pressure head and the sample to react in a high temperature state; opening an air hammer, compacting the sample, controlling the pressure to be about 100Kg, then opening a Gleeble3800 thermal simulation tester and leftwards moving the pressure head to a proper position; carrying out vacuum pumping, and charging Ar gas for protection when the vacuum degree is up to 2.4*10 to 1tau; carrying out compression by adopting the Jaw control mode; and after equipment operation is finished, reserving a high temperature organization state by adopting a direct quenching method, verifying precipitation and recrystallization conditions, and finishing the stress relaxation test. The invention has low cost and high precision and can be used for researching the precipitation behavior of various strain induced precipitates.

Description

technical field [0001] The invention relates to a thermal simulation test method, in particular to a method for testing a stress relaxation curve on a Gleeble3800 hydraulic wedge unit with a Jaw control mode. Background technique [0002] In recent years, with the development of the controlled rolling and controlled cooling (TMCP) process of high-strength low-alloy steel, the research on the solid solution and precipitation of microalloys in hot deformed austenite has become more and more important. The methods used to study the deformation-induced precipitation process usually include: (1) TEM observation of thin film samples; (2) TEM observation of extracted replica samples; (3) resistance measurement; (4) microhardness method; ( 5) Electrochemical extraction, etc. All of these methods must be quenched to retain the high temperature state. Not only the workload is large, but also the measurement accuracy is low. The stress relaxation method is based on the analysis of th...

Claims

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Application Information

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IPC IPC(8): G01N3/00G01N3/10
Inventor 范益邱红雷
Owner NANJING IRON & STEEL CO LTD
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