CN107824995B - Welding method applied to aluminum-containing oxide dispersion strengthened ferrite/martensite steel - Google Patents
Welding method applied to aluminum-containing oxide dispersion strengthened ferrite/martensite steel Download PDFInfo
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- CN107824995B CN107824995B CN201710814927.2A CN201710814927A CN107824995B CN 107824995 B CN107824995 B CN 107824995B CN 201710814927 A CN201710814927 A CN 201710814927A CN 107824995 B CN107824995 B CN 107824995B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3053—Fe as the principal constituent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3053—Fe as the principal constituent
- B23K35/3066—Fe as the principal constituent with Ni as next major constituent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3053—Fe as the principal constituent
- B23K35/3073—Fe as the principal constituent with Mn as next major constituent
Abstract
The invention relates to a welding method of key structural materials of a fourth generation nuclear reactor, in particular to a welding method of aluminum-containing oxide dispersion strengthened ferrite/martensite steel, which adopts an iron-based interlayer alloy foil with the components of (8-18) wt.% of Ni, (8-18) wt.% of Cr, 3wt.% of B, 2wt.% of Si and (0.05-0.08) wt.% of C, and utilizes a transition liquid phase diffusion welding method to weld the aluminum-containing oxide dispersion strengthened ferrite/martensite steel, wherein the welding temperature is 1150-1200 ℃, the holding time is 1-2h, the pressure is 5-10MPa, a high-density and nano-size NiAl phase is generated at the interface of the welded aluminum-containing dispersion strengthened ferrite/martensite steel and the interlayer foil, and the welded aluminum-containing dispersion strengthened ferrite/martensite steel is broken at the aluminum-containing dispersion strengthened ferrite/martensite steel part in a tensile sample at room temperature to 700 DEG C .
Description
Technical Field
The invention relates to a welding technology of key structural materials of a fourth-generation nuclear reactor, in particular to a welding method of aluminum-containing oxide dispersion strengthened ferrite/martensite steel.
Background
Due to the characteristic of dispersion distribution of oxide nanoparticles in the oxide dispersion strengthened steel, the oxide dispersion strengthened steel has excellent high-temperature mechanical property and radiation resistance, and becomes a promising candidate material of a structural material in an advanced nuclear energy system.
The oxide dispersion strengthened steel is usually manufactured by adopting forming processes such as mechanical alloying, hot isostatic pressing or hot extrusion and the like, the material is in a non-metallurgical equilibrium state, and the traditional fusion welding can separate oxide dispersion particles in an alloy matrix from liquid metal and aggregate the oxide dispersion particles into slag, so that the structure and the performance of the oxide dispersion strengthened steel are fundamentally damaged. Therefore, welding of oxide dispersion strengthened steel becomes a key and difficult problem restricting its engineering application.
At present, researches on welding methods of oxide dispersion strengthened steel comprise friction stir welding, solid-phase diffusion welding, brazing, electromagnetic pulse welding, vacuum electron beam welding, laser welding and other high-energy welding. Due to the practical application characteristics of various welding modes and the reason that the welding joint structure (crystal grains and dispersed particles) is different from the base material structure and the welding quality is influenced, no ideal welding mode exists for the welding of the oxide dispersion strengthened steel.
Based on the above facts, the present invention provides a welding method that can obtain excellent welding properties for an oxide dispersion strengthened ferrite/martensite steel of the type to which an aluminum element is added.
Disclosure of Invention
A first object of the present invention is to provide a welding method for an oxide dispersion strengthened ferritic/martensitic steel containing aluminum.
The second purpose of the invention is to provide an application of the welding method for the aluminum-containing oxide dispersion strengthened ferrite/martensite steel on the fourth generation nuclear reactor key structural material.
In order to realize the purpose of the invention, the technical scheme is as follows:
the welding method of the aluminum-containing oxide dispersion strengthened ferrite/martensite steel adopts transition liquid phase diffusion welding to weld the aluminum-containing oxide dispersion strengthened ferrite/martensite steel;
the intermediate layer adopted by the transition liquid phase diffusion welding is an iron-based alloy foil containing nickel;
the thickness of the intermediate layer of the transition liquid phase diffusion welding is 10-30 μm;
the nickel-containing iron-based alloy foil comprises (8-18) wt.% Ni, 8-18) wt.% Cr, 3wt.% B, 2wt.% Si, 0.05-0.08) wt.% C, the purity of the alloy foil is 99.9%, and the balance of Fe;
the specific welding method comprises the following steps:
(1) surface treatment
Respectively polishing the surfaces to be welded of the aluminum-containing oxide dispersion-strengthened ferrite/martensitic steel and the interlayer foil, then respectively putting the surfaces into an acetone solution for ultrasonic cleaning for 5-10 min, and drying the surfaces by cold air to obtain the pretreated aluminum-containing oxide dispersion-strengthened ferrite/martensitic steel and the pretreated interlayer foil;
assembling pretreated aluminum oxide-containing dispersion strengthened ferrite/martensite steel, pretreated interlayer foil and pretreated aluminum oxide-containing dispersion strengthened ferrite/martensite steel in sequence from top to bottom;
(2) the welding equipment adopts a vacuum hot pressing furnace, the temperature rise speed is 6-8 ℃/min, the welding temperature is 1150-;
(3) and a NiAl phase with high density and nanometer size is generated at the interface of the welded aluminum-containing dispersion strengthened ferrite/martensite steel and the interlayer foil, and samples of the welded aluminum-containing dispersion strengthened ferrite/martensite steel are partially broken in the aluminum-containing dispersion strengthened steel in a tensile test at the temperature ranging from room temperature to 700 ℃.
The invention has the following beneficial effects:
(1) according to the invention, the Fe-Ni-B-Si intermediate layer foil with specific components and optimized welding parameter control are adopted to obtain excellent welding performance, which is mainly attributed to that under the optimized welding parameter condition, aluminum in aluminum-containing oxide dispersion strengthened ferrite/martensite steel and nickel in the intermediate layer are diffused mutually, so that the aluminum-containing oxide dispersion strengthened ferrite/martensite steel at two sides of an interface and the nickel and the aluminum in the intermediate layer are caused to react mutually to generate a high-density nano-sized intermetallic compound NiAl phase, and thus excellent mechanical performance is ensured.
(2) The nickel content in the foil of the middle layer ensures that sufficient nickel and aluminum generate a small-size and high-density NiAl phase; but also ensures that the nickel content in the foil substrate of the intermediate layer is reduced after welding, and the structure is changed from a ferrite/austenite dual-phase structure to a ferrite structure.
Description of the drawings:
FIG. 1 is a dispersion particle distribution in an aluminum-containing oxide dispersion strengthened ferrite/martensite steel in example 1
FIG. 2 is a graph showing the distribution of small-sized, high-density NiAl phase in a welded joint of an aluminum-containing oxide-dispersion-strengthened ferrite/martensite steel in example 1
FIG. 3 shows a welded joint of an aluminum-containing oxide-dispersion strengthened ferritic/martensitic steel obtained in example 2
The specific implementation mode is as follows:
example 1
Selecting materials:
(1) the components of the aluminum-containing oxide dispersion strengthened ferrite/martensite steel to be welded are 8.5% of Cr, 1.2% of W, 0.2% of V, 0.2% of Mn, 3.5% of Al, 0.5% of Zr and 0.35% of Y2O3, the purity of the above raw materials is 99.9%, the content of C, N is less than 0.1%, and the balance is Fe, wherein the above raw materials are in mass percentage; the preparation method comprises the steps of mechanical alloying and hot isostatic pressing forming;
(2) the middle layer foil comprises 16wt.% of Ni, 8.5wt.% of Cr, 3wt.% of B, 2wt.% of Si and 0.08wt.% of C, the purities of the Ni and the C are all 99.9%, and the balance of Fe; the thickness is 15 μm;
the specific welding process comprises the following steps:
(1) surface treatment
Respectively polishing the surfaces to be welded of the aluminum-containing oxide dispersion-strengthened ferrite/martensitic steel and the interlayer foil, then respectively putting the surfaces into an acetone solution for ultrasonic cleaning for 5-10 min, and drying the surfaces by cold air to obtain the pretreated aluminum-containing oxide dispersion-strengthened ferrite/martensitic steel and the pretreated interlayer foil;
assembling pretreated aluminum oxide-containing dispersion strengthened ferrite/martensite steel, pretreated interlayer foil and pretreated aluminum oxide-containing dispersion strengthened ferrite/martensite steel in sequence from top to bottom;
(2) the welding equipment adopts a vacuum hot pressing furnace, the temperature rising speed is 7oC/min, the welding temperature is 1177 ℃, the heat preservation time is 1.5h, the pressure is 8MPa, and the vacuum degree is 3.5 multiplied by 10 < -3 > Pa;
(3) and a high-density nano-sized NiAl phase is generated at the interface of the welded aluminum-containing dispersion strengthened steel and the interlayer foil, and samples of the welded aluminum-containing dispersion strengthened steel are partially broken in the aluminum-containing dispersion strengthened steel in a tensile test at the temperature ranging from room temperature to 700 ℃.
Example 2
Selecting materials:
(1) the components of the aluminum-containing oxide dispersion strengthened ferrite/martensite steel to be welded are 9% of Cr, 1.8% of W, 0.3% of V, 0.2% of Mn, 4.5% of Al, 0.2% of Hf and 0.4% of Y2O3, the purity of the above raw materials is 99.9%, the content of C, N is less than 0.1%, and the balance is Fe, wherein the above raw materials are all in mass percentage; the preparation method comprises the steps of mechanical alloying and hot isostatic pressing forming;
(2) the middle layer foil comprises 12wt.% of Ni, 9wt.% of Cr, 3wt.% of B, 2wt.% of Si and 0.06wt.% of C, the purities of the intermediate layer foil are 99.9%, the balance is Fe, and the thickness of the intermediate layer foil is 20 micrometers;
the specific welding process comprises the following steps:
(1) surface treatment
Respectively polishing the surfaces to be welded of the aluminum-containing oxide dispersion-strengthened ferrite/martensitic steel and the interlayer foil, then respectively putting the surfaces into an acetone solution for ultrasonic cleaning for 5-10 min, and drying the surfaces by cold air to obtain the pretreated aluminum-containing oxide dispersion-strengthened ferrite/martensitic steel and the pretreated interlayer foil;
assembling pretreated aluminum oxide-containing dispersion strengthened ferrite/martensite steel, pretreated interlayer foil and pretreated aluminum oxide-containing dispersion strengthened ferrite/martensite steel in sequence from top to bottom;
(2) the welding equipment adopts a vacuum hot pressing furnace, the heating speed is 8 ℃/min, the welding temperature is 1190 ℃, the heat preservation time is 2h, the pressure is 10MPa, and the vacuum degree is 5 multiplied by 10 < -3 > Pa;
(3) the interface of the welded aluminum-containing dispersion strengthened ferrite/martensite steel and the interlayer foil generates a high-density nano-sized NiAl phase, and in a tensile test of the welded aluminum-containing dispersion strengthened steel in a temperature range from room temperature to 700 ℃, samples are broken at the aluminum-containing dispersion strengthened steel part.
Claims (1)
1. A welding method of aluminum-containing oxide dispersion strengthened ferrite/martensite steel is characterized in that: the welding method is to adopt transition liquid phase diffusion welding to weld the aluminum-containing oxide dispersion strengthened ferrite/martensite steel;
the intermediate layer adopted by the transition liquid phase diffusion welding is an iron-based alloy foil containing nickel;
the thickness of the intermediate layer of the transition liquid phase diffusion welding is 10-30 μm;
the intermediate layer has the composition of (8-18) wt.% Ni, (8-18) wt.% Cr, 3wt.% B, 2wt.% Si, (0.05-0.08) wt.% C, all with a purity of 99.9%, and the balance Fe;
the specific welding process comprises the following steps:
(1) surface treatment
Respectively polishing the surfaces to be welded and the intermediate layer of the aluminum-containing oxide dispersion-strengthened ferrite/martensitic steel, then respectively putting the surfaces to be welded and the intermediate layer into an acetone solution for ultrasonic cleaning for 5-10 min, and drying the surfaces by cold air to obtain the pretreated aluminum-containing oxide dispersion-strengthened ferrite/martensitic steel and the pretreated intermediate layer;
assembling pretreated aluminum-containing oxide dispersion strengthened ferrite/martensite steel, a pretreated intermediate layer and pretreated aluminum-containing oxide dispersion strengthened ferrite/martensite steel in sequence from top to bottom;
(2) the welding equipment adopts a vacuum hot-pressing sintering furnace, the heating rate is 6-8 ℃/min, the welding temperature is 1150--3Pa；
(3) And a NiAl phase with high density and nanometer size is generated at the interface between the welded aluminum-containing oxide dispersion strengthened ferrite/martensite steel and the intermediate layer, and in a tensile test of the welded aluminum-containing oxide dispersion strengthened ferrite/martensite steel at the temperature range of room temperature to 700 ℃, tensile samples are partially broken in the aluminum-containing oxide dispersion strengthened ferrite/martensite steel.
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| CN111872538B (en) * | 2020-07-31 | 2021-12-07 | 青岛理工大学 | ODS steel welding method based on composite nano particle reinforced interlayer |
| CN114622138B (en) * | 2022-03-03 | 2023-03-31 | 上海大学 | A kind of 11 B-doped oxide dispersion strengthened alloy, preparation method and application thereof |
Citations (4)
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|---|---|---|---|---|
| CN1198116A (en) * | 1996-06-04 | 1998-11-04 | 新日本制铁株式会社 | Iron-base alloy foils for liquid-phase diffusion bonding of iron-base material bondable in oxidizing atmosphere |
| CN1394978A (en) * | 2002-08-02 | 2003-02-05 | 山东中实股份有限公司 | Instantaneous liquid-phase diffusion welding iron base amorphous interlayer alloy |
| CN103252572A (en) * | 2013-05-10 | 2013-08-21 | 山东大学 | Transient liquid phase diffusion bonding process of molybdenum copper alloy and stainless steel |
| CN106825896A (en) * | 2017-04-06 | 2017-06-13 | 爱迪森自动化科技（昆山）有限公司 | A kind of hard alloy connects method with the composite interlayer liquid-phase diffusion welding of steel |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5816794A (en) * | 1981-07-20 | 1983-01-31 | Mitsubishi Metal Corp | Brazing material for transient liquid phase bonding |
| CN102260809A (en) * | 2011-07-06 | 2011-11-30 | 西安理工大学 | Interlayer alloy for bonding Q235 steel to 316L steel in TLP (transient liquid phase) and method for preparing same |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1198116A (en) * | 1996-06-04 | 1998-11-04 | 新日本制铁株式会社 | Iron-base alloy foils for liquid-phase diffusion bonding of iron-base material bondable in oxidizing atmosphere |
| CN1394978A (en) * | 2002-08-02 | 2003-02-05 | 山东中实股份有限公司 | Instantaneous liquid-phase diffusion welding iron base amorphous interlayer alloy |
| CN103252572A (en) * | 2013-05-10 | 2013-08-21 | 山东大学 | Transient liquid phase diffusion bonding process of molybdenum copper alloy and stainless steel |
| CN106825896A (en) * | 2017-04-06 | 2017-06-13 | 爱迪森自动化科技（昆山）有限公司 | A kind of hard alloy connects method with the composite interlayer liquid-phase diffusion welding of steel |
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