A local heat treatment method after repair welding of martensitic precipitation hardening stainless steel

A local heat treatment and precipitation hardening technology, applied in the field of welding and martensitic precipitation hardening stainless steel, can solve the problems of difficult control of heating temperature and poor temperature uniformity, and achieve reliable calibration results, simple methods and guaranteed temperature uniformity Effect

Active Publication Date: 2016-10-05
WUXI TURBINE BLADE
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Problems solved by technology

[0003] In view of the above problems, the present invention provides a local heat treatment method after repair welding of martensitic precipitation hardening stainless steel, which can solve the problems of difficult control of heating temperature and poor temperature uniformity existing in existing local heat treatment methods

Method used

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  • A local heat treatment method after repair welding of martensitic precipitation hardening stainless steel
  • A local heat treatment method after repair welding of martensitic precipitation hardening stainless steel
  • A local heat treatment method after repair welding of martensitic precipitation hardening stainless steel

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Embodiment Construction

[0019] Describe the implementation process of the inventive method in detail below in conjunction with an experimental example:

[0020] For a part whose material is 0Cr13Ni8Mo2Al, the maximum allowable length L of repair welding is 50 mm. If the hardness of the heat-affected zone decreases after defect repair welding, the heat-affected zone (see figure 1 ) for local heat treatment, the local heat treatment process is set at 530±5°C and the holding time is 2 hours. figure 1 Among them, 1 is the surfacing layer, 2 is the base metal, and 3 is the repair welding seam;

[0021] (1) Prepare the calibration part: use the same material as the part to prepare the calibration part 6, and the calibration part should undergo the same heat treatment and machining treatment as the part to ensure the same material state, and drill three test holes on one side of the calibration part , respectively test hole A, test hole B and test hole C, see figure 2 , the positions of the three test ho...

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Abstract

The invention provides a method for conducting partial heat treatment on martensitic precipitated hardening stainless steel after repair welding. The method can solve the problems that in an existing partial heat treatment method, the heating temperature is difficult to control, and the temperature uniformity is poor. An induction heating method is used for conducting partial heat treatment on a repair welded part. The method is characterized in that before partial heat treatment is conducted, the heating temperature for partial heat treatment of the repair welded part is calibrated, through calibration of the heating temperature for partial heat treatment, the difference between the temperature of a surface infrared temperature sensor and the inner temperature of the part in the heating process is determined, and according to the temperature difference, the actual heating temperature for induction heating in the partial heat treatment process is determined.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to the field of welding technology of martensitic precipitation hardening stainless steel, in particular to a local heat treatment method for martensitic precipitation hardening stainless steel after repair welding. Background technique [0002] Martensitic precipitation hardening stainless steel will have defects that do not meet the quality requirements in some parts after surfacing. These defects need to be repaired by local argon arc welding, and at this time the whole part has completed the solid solution-adjustment-aging heat treatment process. For example, the hardness of the heat-affected zone of stainless steel parts using 0Cr13Ni8Mo2Al (PH13-8Mo) will drop below 350HV after local repair welding, which is far below the requirement that the hardness of the parts is greater than 440HV. Therefore, heat treatment is required after repair welding, but it cannot The whole part i...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D6/00C21D11/00
Inventor 张铁磊汤先辉尹追毛志刚胡仁杰王烜烽
Owner WUXI TURBINE BLADE
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