Welding and heat treatment method of age-strengthened nickel-based superalloy and heat-resistant steel
A technology of nickel-based superalloy and heat treatment method, used in heat treatment furnaces, heat treatment equipment, welding equipment, etc., can solve the problems of difficult-to-weld joints, high crystallization cracks and strain aging crack susceptibility, and achieve the effect of reducing the tendency of liquefaction cracks
Active Publication Date: 2021-07-20
DONGFANG TURBINE CO LTD
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Problems solved by technology
[0004] Age-strengthened nickel-based superalloys mainly use γ' rich in Al and Ti and specific carbides as strengthening phases. The welded joints have high susceptibility to crystallization cracks and strain aging cracks, especially in the heat-affected zone. γ' eutectic with low melting point forms microcracks under welding thermal stress, and the heat-affected zone structure after welding needs aging treatment to achieve the best material state, but its aging temperature is inconsistent with the stress relief temperature of heat-resistant steel after welding , so it is difficult to obtain a welded joint with complete performance and no welding defects at one time
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[0025] All features disclosed in this specification, or steps in all methods or processes disclosed, may be combined in any manner, except for mutually exclusive features and / or steps.
[0026] Any feature disclosed in this specification, unless specifically stated, can be replaced by other alternative features that are equivalent or have similar purposes. That is, unless expressly stated otherwise, each feature is one example only of a series of equivalent or similar features.
[0027] In the welding and heat treatment method of an aging-strengthened nickel-based superalloy and a heat-resistant steel in this embodiment, the material of the base material 1 is an aging-strengthened nickel-based superalloy, the material of the base material 2 is heat-resistant steel, and the base material 1 For solid solution, comprising the following steps:
[0028] Step 1, using a solid solution superalloy welding consumable-welding base metal-welding groove to form a transition layer;
[00...
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The invention discloses a welding and heat treatment method of an age-strengthened nickel-based superalloy and a heat-resistant steel, and belongs to the technical field of welding connection of an aging-strengthened nickel-based superalloy and a heat-resistant steel. A welding and heat treatment method of an aging-strengthened nickel-based superalloy and a heat-resistant steel according to the present invention, the material of the first base material is an aging-strengthened nickel-based superalloy, the material of the second base material is heat-resistant steel, and the first base material is The solid solution state comprises the following steps: step 1, adopting a solid solution superalloy welding consumable-welding groove of the base metal-to form a transition layer; step 2, performing aging heat treatment on the base metal; step 3, using solid solution Dissolving superalloy welding consumable 2 applies the transition layer of base metal 1 and base metal 2 to connect them to form a welded joint; step 4, perform stress-relief heat treatment on the welded joint. When the invention is adopted, the welding joint between the age-strengthened nickel-based superalloy and the heat-resistant steel basically has no defects, and the structure and performance of each area of the welding joint are better.
Description
technical field [0001] The invention relates to a welding and heat treatment method of an age-strengthened nickel-based superalloy and a heat-resistant steel, and belongs to the technical field of welding connection of an aging-strengthened nickel-based superalloy and a heat-resistant steel. Background technique [0002] When the steam temperature of the steam turbine increases to 650°C or even higher, the requirements for the oxidation and corrosion resistance, thermal stability, and high-temperature durability of the rotor material are extremely strict. Traditional ferritic alloy steel and new austenitic steel can no longer To meet the requirements of use, nickel-based superalloys must be used. [0003] The use of integral forged nickel-based superalloy rotors is not suitable or cannot be realized, no matter from the casting and forging process of nickel-based superalloys (there is a technical bottleneck in the smelting and forging tonnage of superalloys), or from the econ...
Claims
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IPC IPC(8): B23K31/02C21D9/50C22F1/10
CPCB23K31/02B23K2103/04B23K2103/08C21D9/50C22F1/10
Inventor 熊建坤杨林徐健聂甫恒余勇文仲波郑亮亮曹天兰钟玉向冲毛桂军吴海峰许德星王大勇邓传印
Owner DONGFANG TURBINE CO LTD