Method and device capable of improving hydrogen brittleness resistance of stainless steel materials substantially

A kind of stainless steel, a remarkable technology, applied in the field of anti-hydrogen embrittlement performance of stainless steel material (316L), it can solve the problems of large investment, complex process, introduction of a large number of hydrogen atoms, etc., to improve the anti-hydrogen embrittlement performance, reduce pollution and anti-hydrogen embrittlement effect. outstanding effect

Active Publication Date: 2015-12-02
JIANGSU UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to improve the anti-hydrogen embrittlement performance of the existing stainless steel materials mainly from the aspects of material composition and coating, the process is complicated, and the electroplating process will still introduce a large amount of hydrogen atoms. Considering the problem, a simple process is invented. A high-efficiency laser warm shot peening surface strengthening treatment method, and a corresponding strengthening device is designed at the same time

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  • Method and device capable of improving hydrogen brittleness resistance of stainless steel materials substantially
  • Method and device capable of improving hydrogen brittleness resistance of stainless steel materials substantially
  • Method and device capable of improving hydrogen brittleness resistance of stainless steel materials substantially

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Embodiment 1

[0042] like Figure 1~3 shown.

[0043] Taking 316L stainless steel as an example below, use a method in the present invention that can significantly improve the hydrogen embrittlement resistance of 316L stainless steel to carry out surface treatment, the principle is as follows figure 1 As shown, the laser energy of the laser 5 is set to 8J, the beam diameter is 4mm, and the spot overlap rate is 50%. During specific implementation, the laser energy, beam diameter, and spot overlap rate can be adjusted and selected according to the size, thickness and model of the workpiece; the specific steps include:

[0044]A. Place the stainless steel workpiece 11 on the heating platform 10, open the rotary valve 15 of the nitrogen tank 17, and adjust the outlet pressure of the nozzle 13 according to the pressure gauge 16 to 3.5×10 5 Pa, to drive away the hydrogen atoms overflowing from the surface of the sample or in the air; at the same time, turn on the heating platform controller 25,...

Embodiment 2

[0052] like figure 1 shown.

[0053] A device that can significantly improve the hydrogen embrittlement resistance of 316L stainless steel, which includes a first horizontal motion platform 22 and a second horizontal motion platform 23, the first horizontal motion platform 22 is installed on the second horizontal motion platform 23, the first horizontal motion platform The platform 22 and the second horizontal motion platform 23 work together under the control of the computer 1 to move forward, backward, and left and right in the horizontal direction of the work, providing motion guarantee for the laser impact of the stainless steel workpiece 11. The first horizontal motion platform 22 is provided with a silicon oil recovery constraint. In the collection tank 18 of layer 9, a boss 24 is installed at the center of the collection tank 18. The height of the boss 24 can be designed to be high or fixed. The boss 24 is used to place the heating platform 10, and the bottom of the col...

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Abstract

The invention discloses a method and device capable of improving hydrogen brittleness resistance of 316L stainless steel substantially. The method comprises the steps that surface hydrogen atoms are promoted to separate out through high temperature (250-450 DEG C), and then laser shock is conducted at the dynamic strain aging temperature (300-450 DEG C); on the one hand, the precipitation of the hydrogen atoms is accelerated through plastic deformation, and on the other hand, secondary invasion of the hydrogen atoms in the cooling process is hindered; meanwhile, the hydrogen brittleness phenomenon caused by hydrogen atom evasion and hydrogen atom segregation in the hydrogen service environment is effectively hindered by utilizing the pinning effect of high-density dislocation and crystal boundary, the hydrogen-induced martensite phase change of the 316L stainless steel is reduced substantially, and the surface properties and fatigue properties of the 316L stainless steel in the hydrogen-type corrosion environment can be improved effectively by combining high-amplitude residual compressive stress induced by the laser shock. The device comprises core assemblies including a laser device, a heating platform, a moving platform, a restraint system and a nitrogen protection system. The method and device have the advantages of being simple in structure, controllable in process, low in cost and the like.

Description

technical field [0001] The invention relates to the field of surface strengthening of materials and the field of laser processing technology, especially a hydrogen embrittlement resistance technology for stainless steel materials, specifically a method for significantly improving the hydrogen embrittlement resistance performance of stainless steel materials (316L) by using high temperature and laser temperature shot peening technology Composite methods and devices. Background technique [0002] 316L stainless steel is the most widely used non-ferrous alloy metal in industry or marine atmosphere. It is often used as a high-pressure and hydrogen-resistant substrate for hydrogen storage tanks in hydrogen energy vehicles. However, when the material is served in a hydrogen-containing medium for a long time, the corresponding plasticity will decrease, resulting in hydrogen-induced brittle fracture. For this reason, the research on improving the hydrogen embrittlement resistance o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D6/00C21D10/00
Inventor 周建忠郑阳孟宪凯冯旭盛杰黄舒苏纯周宏达
Owner JIANGSU UNIV
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