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Thermal-cold cycling treatment method for high-speed train body structure material

A technology of cold and heat cycle treatment and car body structure, which is applied in the field of strengthening and toughening of aluminum alloy welded joints, can solve the problems of poor impact toughness, etc. Effect

Inactive Publication Date: 2015-08-26
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the problem of poor impact toughness of the aluminum alloy welded joints of the existing high-speed train car body under low temperature and cold conditions, and propose a cold-heat cycle treatment method suitable for high-speed train car body structural materials. The low-temperature cryogenic process of the alloy is combined with the high-temperature annealing process, and the cold-heat cycle process of cryogenic treatment and high-temperature annealing is used to improve the low-temperature performance of the aluminum alloy car body welding part of the high-speed train body during the rain and snow falling process

Method used

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  • Thermal-cold cycling treatment method for high-speed train body structure material
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  • Thermal-cold cycling treatment method for high-speed train body structure material

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Effect test

Embodiment 1

[0030] Embodiment 1: 6XXX series aluminum alloys are subjected to 1 cooling and heating cycle treatment, including the following process steps:

[0031] Put the 3mm×20mm×100mm 6005A aluminum alloy welded joint thin plate workpiece into a crucible resistance furnace at 410~430℃ for 2~5 hours for homogenization annealing treatment, take it out and slowly cool down to room temperature; then put it in an ultra-low temperature deep In the freezer, first keep warm at -40~-60°C for 30~50 minutes; then continue cooling to the range of -160~-180°C at a cooling rate of 15°C / min, and keep warm for 6~8 hours; then heat to -40~ Insulate at -60°C for 30~50 minutes, then take the workpiece out of the deep freezer, place it in the air and let it warm up to room temperature naturally, and let it stand for 1~2 hours; Strength increased from 190.95MPa to 211.65Mpa, impact toughness increased from 28.1J cm -2 Increased to 33.4 J cm-2 .

Embodiment 2

[0032] Embodiment 2: 6XXX series aluminum alloys are subjected to 2 cold and hot cycle treatments, including the following process steps:

[0033] (1) Put the 3mm×20mm×100mm 6005A aluminum alloy welded joint thin plate workpiece into a crucible resistance furnace at 410~430℃ for 2~5 hours for homogenization annealing treatment, take it out and slowly cool down to room temperature; then put it In an ultra-low temperature deep freezer, keep warm at -40~-60°C for 30~50 minutes; then continue cooling to -160~-180°C at a cooling rate of 15°C / min, and keep warm for 6~8 hours; then heat to - Keep warm at 40~-60°C for 30~50 minutes, then take the aluminum alloy workpiece out of the deep freezer, place it in the air and let it warm up to room temperature naturally, and let it stand for 1~2 hours.

[0034] (2) Put the aluminum alloy workpiece into the deep freezer and repeat the operation of step (1), that is, complete the two cold and hot cycle cryogenic treatments of the aluminum allo...

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Abstract

The invention discloses a thermal-cold cycling treatment method for a high-speed train body structure material. An aluminum alloy fusion arc welding joint workpiece of a high-speed train body structure is put into a crucible type resistance furnace for uniformly annealing by 2-5 hours at a temperature of 410-430 DEG C; the workpiece is taken out to put in air for cooling to the room temperature; the workpiece is put into a deep cooling cabinet; firstly, the workpiece is cooled to a temperature of -40 to -60 DEG C, and the temperature is kept by 30-50 minutes; then, the workpiece is continuously cooled to a temperature range of -160 to -180 DEG C with a cooling speed of 15 DEG C / min, and the temperature is kept by 6-8 hours; and finally, the workpiece is heated up to a temperature of -40 to -60 DEG C, and the temperature is kept by 30-50 minutes. The thermal-cold cycling treatment method combines the low-temperature deep cooling treatment with the high-temperature annealing process to realize the intensified control of the static tensile property and the low-temperature plasticity and toughness of materials, so that the structure morphology is improved, the influence of the flow stress is eliminated, and the tensile strength, the ductility and the impact toughness of the materials are improved.

Description

technical field [0001] The invention relates to a low-temperature strengthening and toughening process for high-speed train car body materials, in particular to a strengthening and toughening process for aluminum alloy welded joints of high-speed train car bodies. Background technique [0002] The body material of high-speed trains is Al-Mg-Si medium-strength aluminum alloy represented by 6005A aluminum alloy, which has been widely used in high-speed trains because of its excellent extrusion formability and good weldability. However, with the increasing speed of trains and the deteriorating service conditions, higher and higher requirements are put forward for the service performance of train body materials. Although the existing 6005A aluminum alloy for vehicles has good comprehensive performance, its welding area does not have similar performance, especially the welding part of the aluminum alloy car body as a structural material, such as the front skin, floor, end wall, e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/04
Inventor 季凯张静徐玉松金云学
Owner JIANGSU UNIV OF SCI & TECH
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