Ferronickel-based alloy welding joint heat-affected zone grain boundary liquation crack control method

An iron-nickel-based alloy and heat-affected zone technology, applied in welding/welding/cutting articles, welding equipment, welding equipment, etc., can solve problems such as liquefaction cracks, achieve control of welding deformation, improve joint strength, and facilitate surface forming Effect

Active Publication Date: 2015-04-01
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for controlling grain boundary liquefaction cracks in the heat-affected zone of iron-nickel-based alloy welded joints, so as to solve the problems in the prior art that iron-nickel-based alloy joints are prone to form wider gamma-poor regions and grain boundary liquefaction cracks

Method used

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  • Ferronickel-based alloy welding joint heat-affected zone grain boundary liquation crack control method
  • Ferronickel-based alloy welding joint heat-affected zone grain boundary liquation crack control method
  • Ferronickel-based alloy welding joint heat-affected zone grain boundary liquation crack control method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Vacuum electron beam welding of J75 alloy plates with specifications of 180mm (length) × 60mm (width) × 4.0mm (thickness), the specific implementation process is as follows:

[0032] 1. The J75 alloy plate blanks are all hot-rolled plates, and the chemical composition and mechanical properties of the hot-rolled plates meet the requirements of GJB 5724-2006 "Specification for Hydrogen-resistant Steel Bars". The J75 plate was treated at 980°C / 1h, water quenched +740°C / 8h, and air-cooled. The plate after heat treatment is machined to 3.5-4.5 mm (4.0 mm in this embodiment), and the length direction is machined to roughness Ra1.6 μm by grinding machine.

[0033] 2. Carry out decontamination treatment on the base metal after polishing treatment in step 1. During the treatment, petroleum ether is first used to degrease, and then alcohol is used to scrub. The decontamination treatment needs to be carried out within 30 minutes before welding;

[0034] 3. Clamp and fix the J75 a...

Embodiment 2

[0046] The vacuum electron beam welding of the J75 alloy plate with a specification of 120mm (length) × 60mm (width) × 11mm (thickness), differs from Example 1 in that the thickness of the welded J75 alloy plate is 11mm, and the welding process parameters are adjusted accordingly , Post-weld modification welding process parameters and electron beam scanning times.

[0047] The J75 alloy plate blank with the same heat treatment as in Example 1 was adopted, machined to a thickness of 11 mm after heat treatment, and processed to a roughness of Ra1.6 μm by a grinder in the length direction; petroleum ether was used to degrease 30 minutes before welding, and the grinding was scrubbed with alcohol. The base metal after light treatment; then use the butt joint and tight fit method to clamp and fix the two J75 alloy plates in the welding room, and keep the two base metals placed horizontally; close the vacuum welding room and pump the vacuum to 8×10 -3 After Pa, the positioning weldin...

Embodiment 3

[0052] The vacuum electron beam welding of the J75 alloy plate with a specification of 150mm (length) × 80mm (width) × 19mm (thickness), differs from Example 1 in that the thickness of the welded J75 alloy plate is 19mm, and the welding process parameters are adjusted accordingly , Post-weld modification welding process parameters and electron beam scanning times.

[0053] The J75 alloy plate blank with the same heat treatment as in Example 1 was adopted, machined to a thickness of 19 mm after heat treatment, and processed to a roughness of Ra1.6 μm by a grinder in the length direction; petroleum ether was used to degrease 30 minutes before welding, and the grinding was scrubbed with alcohol. The base metal after light treatment; then two pieces of J75 alloy plates are clamped and fixed in the welding room by means of butt joint and tight fit, and the two base metals are placed horizontally; the vacuum welding room is closed and the vacuum degree is evacuated to 5×10 -3 After ...

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Abstract

The invention relates to the field of ferronickel-based alloy welding, particularly to a ferronickel-based precipitation strengthening austenite alloy (J75) joint heat-affected zone grain boundary liquation crack control method. The method solves the problem ferronickel-based alloy joints are prone to forming relatively wide gamma'-depleted zones or grain boundary liquation cracks. The ferronickel-based alloy welding, particularly to a ferronickel-based precipitation strengthening austenite alloy joint heat-affected zone grain boundary liquation crack control method is implemented through vacuum electron beam welding and composed of the technological processes of pre-welding base metal treatment, vacuum welding chamber internal clamping and fixing, welding chamber vacuumizing, positioned welding, single-cycle welding with electron beam deflective scanning, post-welding modification welding and post-welding electron beam defocused welding joint scanning. Ferronickel-based alloy joints welded through the method have no gamma'-depleted zones and grain boundary liquation cracks on the heat-affected zones, are good in surface forming and achieve a joint strength higher than 980 MPa or even 1030 MPa, a strength coefficient of base metal higher than 0.9 and an impact toughness (akU) higher than 980 KJ/m2 or even higher than 1020KJ/m2.

Description

technical field [0001] The invention relates to the field of iron-nickel-based alloy welding, in particular to a method for controlling grain boundary liquefaction cracks in a heat-affected zone of an iron-nickel-based precipitation-strengthened austenitic alloy (J75) joint. Background technique [0002] With the development of high-tech fields such as aviation, aerospace and nuclear energy utilization, higher requirements are placed on the materials and devices used. Due to the low strength, single-phase austenitic stainless steels such as 304, 310, 316 and 316L no longer meet the requirements of various fields. Precipitation-strengthened austenitic stainless steel is developed on the basis of single-phase austenitic stainless steel through the alloying of elements such as Ti and Al. This type of alloy is used in the aging state and strengthened by precipitation with a coherent relationship with the matrix. Phase γ′-Ni 3 (Al,Ti) to obtain high strength and good plasticity...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K15/06B23K37/00
CPCB23K15/0033B23K15/0053B23K15/06B23K2103/02
Inventor 赵明久戎利建闫德胜姜海昌胡小锋宋元元陈胜虎王本贤
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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