Can a 2mm thick high alloy 4169 material plate be ultrasonic?

<>GH4169 characteristics and application field overview: GH4169 alloy has good comprehensive properties in the temperature range of -253 700, and the yield strength below 650 ranks first among deformed superalloys, and has good fatigue resistance, radiation resistance, oxidation resistance, corrosion resistance, as well as good processing properties and good welding properties. It is capable of manufacturing a wide range of parts with complex shapes, and has been used in a wide range of temperatures in aerospace, nuclear, petroleum and extrusion dies.

It has the following characteristics.

Ease of processing High tensile strength, fatigue strength, creep strength and breaking strength at 700 °C High oxidation resistance at 1000 °C Stable chemical properties at low temperatures Good weldability.

Applications: Due to its high temperature strength, excellent corrosion resistance and easy processing at 700 °C, it can be widely used in various high-demand occasions.

Steam turbine. Liquid-fueled rockets.

Cryogenic engineering. Acidic environment.

Nuclear engineering GH4169 similar grades: GH4169 GH169 (China), NC19fenb (France), NICR19FE19NB5 (Germany).

GH4169 Metallographic structure: The structure of this alloy in a standard heat-treated state is composed of a matrix'、γ", δ, NBC phase composition GH4169 process performance and requirements: 1. Due to the high niobium content in GH4169 alloy, the degree of niobium segregation in the alloy is directly related to the metallurgical process.

2. In order to avoid excessive segregation of the elements in the ingot, the diameter of the steel ingot is not greater than that of the homogenized alloy with good thermal processing performance, and the heating temperature of the steel ingot shall not exceed 1120. 4. The average grain size of the alloy is closely related to the deformation degree and final forging temperature of the forging. 5. The alloy has satisfactory welding performance, and can be welded by argon arc welding, electron beam welding, seam welding, spot welding and other methods.

6. Different solution treatment and aging treatment processes of alloys will obtain different material properties. Due to the low diffusion rate of the "phase", the best mechanical properties of the GH4169 alloy can be obtained through long-term aging treatment.

GH4169 alloy is an age-hardened nickel-chromium-iron-based deformed alloy successfully developed by Eiselstein of the Huntington branch of the International Nickel Corporation and publicly introduced in 1995. The alloy is a nickel-based deformed superalloy strengthened by precipitation of body-centered cubic g and face-centered cubic g phases, which has high tensile strength, yield strength and good plasticity below 650, and has good comprehensive properties such as corrosion resistance, radiation resistance, fatigue and fracture toughness, as well as satisfactory welding and post-welding forming properties. The alloy has stable microstructure properties in a wide temperature range of -253 650, making it a superalloy with a wide range of applications under cryogenic and high temperature conditions.

Due to the good comprehensive performance of GH4169, it is widely used in compressor discs, compressor shafts, compressor blades, turbine discs, turbine shafts, casings, fasteners and other structural parts and plate welded parts of aero engines.

China began to develop GH4169 alloy in the 70s, which is mainly used in disc parts, and the use time is relatively short, so the duplex process of vacuum induction and electroslag remelting is adopted. In the eighties, it began to be applied to the aviation field, and improving the quality of materials, improving the comprehensive properties and reliability of alloys became the main research directions. At present, the main research directions of GH4169 alloy are:

1) Improve the smelting process, quantify the smelting parameters, realize the stable operation of the program, and make the microstructure of the alloy more uniform, so as to obtain excellent yield and fatigue strength, crack propagation and crack resistance and crack resistance, and improve the low-cycle fatigue strength;

2) Improve the heat treatment process. The current heat treatment process can not well eliminate the segregation of the ingot center, so it has an adverse effect on the uniformity of the microstructure, so the reasonable homogenization annealing process is adopted to obtain the fine-grained blank has become one of the main research directions.

3) Improve the design of use. Since the working temperature of GH4169 cannot be higher than 650, the cooling of parts should be strengthened to give full play to the advantages of high performance and low cost of the superalloy;

4) Improve tissue stability performance. Due to the long life requirements of aero engine components, it is also crucial to improve the long-term aging microstructure stability of GH4169 alloy.

1. Grade: GH4169 precipitation strengthened nickel-based superalloy.

2. Chemical Composition: Carbon C: Chromium Cr: Nickel Ni: 50 55 Cobalt Co: Molybdenum Mo: Aluminum Al: Titanium Ti: Niobium Nb: Boron B:

Manganese Mn: Silicon Si: Sulfur S: Copper Cu: Phosphorus P:

Iron Fe margin.

Three: Scope of applicationApplication field: perennial spot inventory round bar, plate, seamless pipe, tape and reel!

Alloys have been used in the production of rings, blades, fasteners and structural parts in aviation, aerospace and petrochemical industries, and a variety of parts used in petrochemical industry, which can be mass-produced and have good usability. The alloy can be cooled by helium cooling process when vacuum self-consumption remelting, which can effectively reduce niobium segregation, and the injection molding process can be used to produce rings, which can reduce costs and cycles, and superplastic molding can expand the production range.

4. Physical properties: density g cm3 ( melting point (1260 1320) thermal conductivity (w m ) specific heat capacity j kg (435) elastic modulus gpa(199,9) shear modulus gpa(77,2) resistivity m (-Poisson's ratio( linear expansion coefficient A 10-6 -1 (heat treatment method (solution treatment) tensile strength B MPA (965) yield strength (550) elongation 5 % (30) Brinell hardness HBS (363).

Five: Overview: The suitable hot working temperature of the alloy is 1120-900, the cooling method can be water quenching or other rapid cooling methods, and the hot working should be annealed in time to ensure good performance.

During hot processing, the material should be heated to the upper limit of the processing temperature, and in order to ensure the plasticity during processing, the final processing temperature when the deformation reaches 20% should not be lower than 960. Cold working should be carried out after solution treatment, and the work hardening rate is greater than that of austenitic stainless steel, so the processing equipment should be adjusted accordingly, and there should be an intermediate annealing process during cold working.

It can be done.

3. Ultrasonic testing.

1.Testing equipment.

The equipment used should have a product certificate or a certificate of conformity;

The operating frequency of the equipment is changed to;

The measurement of the equipment should be done every three months and should be documented.

Ultrasonic testing is a general method.

The scanning sensitivity should normally not be lower than the reference sensitivity;

The value of the coupling compensation should be measured and should not be always compensated by 4dB, or it should be noted in the report "depending on the surface of the workpiece".

3 test blocks. There are changes between the standard and comparison test blocks;

The material used for the test block must not have defects greater than or equal to the equivalent diameter of 2 flat bottom holes.

4. Steel plate inspection.

The thickness range is extended to 6-250mm;

The probe frequency is changed to 5MHz in the thickness range of 20-40mm;

Sensitivity: When the plate thickness is greater than 3 times the near field, it can be determined in the first wave of the intact part of the steel plate;

When the indication length of the defect is less than 40mm, it will not be recorded;

For the near-field area with a wall thickness of less than 3 times, the attenuation coefficient formula of the workpiece material was modified.

The detection content of steel plate shear wave oblique probe has been added;

The testing content of aluminum and aluminum alloy, titanium and titanium alloy plate has been added;

The detection content of austenitic steel plate and duplex stainless steel plate has been added;

Composite steel plate detection design, substrate thickness is not less than 6mm

Standard GJB 2612-1996 "Specification for Cold Drawn Wire of Superalloy for Welding".

HB 6702-1993 GH4169 Alloy Bar for WZ8 Series

Q 6S 1034-1992 GH4169 alloy bar for high temperature fasteners

Q 3B 548-1996 GH4169 Alloy Forgings

Q 3B 548-1996 GH4169 Alloy Forgings

Q 3B 4048-1993 YZGH4169 Alloy Bar

Q 3B 4050-1993 GH4169 Alloy Plate

Q 3B 4051-1993 GH4169 Alloy Wire

GB T14992-2005

GH4169 plate is GB T14995 GB T14996, plate is GB T14994, GB T14993, and forgings are GB T14997 and GB T14998

GH4169 GH169 is a high-hardness, high-wear-resistant, high-temperature and high-temperature alloy.

Alloy overview: It is an austenitic structure, and the baiy" phase generated after precipitation hardening has relatively satisfactory mechanical properties. The δ phase formed at the grain boundary during the heat treatment process makes it have good plasticity, good strength, high temperature up to 1400°F, oxidation resistance up to 1800°F. The high tensile strength and impact strength of this nickel alloy does not decrease at low temperatures, and it can also be welded well.

Similar grades: GH169 (China).

NC19fenb (France).

NICR19FE19NB5, MO3 (Germany),

NA 51 (UK).

UNS NO7718 (USA).

nicr19nb5mo3(iso)

Physical properties: density g cm3

Melting point 1260-1340

Chemical Composition: C Mn Si P S Cr17 21

ni50~55

Cu Fe Margin.

b Minimum value of mechanical properties of the alloy at room temperature:

Alloy solution treatment tensile strength: 965rm n mm2 yield strength.

Elongation 30 A5 % Brinell hardness 363HB

Metallographic structure: The alloy has an austenite structure, and the Y" phase generated after precipitation hardening has good mechanical properties. The δ phase formed at the grain boundary during the heat treatment process gives it better plasticity.

Corrosion resistance: Alloys have excellent resistance to stress corrosion cracking and pitting in both high and low temperature environments. The alloy is particularly resistant to sunning at high temperatures.

Features:1Ease of processing.

2.It has high tensile strength, pi labor strength, creep strength and breaking strength at 700.

3.It has high resistance to yangization at 1000.

4.It has stable chemical properties at low temperatures.

5.Good welding performance.

Application: Due to its high temperature strength, good corrosion resistance and easy processing at 700, it can be widely used in various high-demand occasions. 1.Steam Turbine 2Liquid fuels 3Cryogenic Engineering 4Acidic environment 5Nuclear engineering.

GH4169 Material Technical Standard

GB T 14992 Classification and grade of high-temperature materials for superalloys and intermetallics.

GJB2611A Specification for Aerospace Superalloy Cold Drawn Bars.

GJB 2612 Specification for superalloy cold drawn wire for welding.

GJB3318A Specification for Superalloy Cold Rolled Strip for Aviation Use.

GJB 3527 Specification for superalloy cold drawn wire for springs.

GJB 5280 specification for superalloy disc forgings for aero engines.

GJB 5301 Specification for high-temperature alloy rings for aero engines.

GJB 712A GH4169 specification for forging round cakes of superalloy for aerospace.

HB Z 140 superalloy heat treatment process for aviation.

Q 5B 4040 High Quality GH4169 Alloy Forgings.

Q 3B 4048 (Q 5B 4029, Fugaoxin 13, Xieshangwu Gao 22X3S280) high-quality GH4169 alloy bar.

Q 3B 4056 (Q 5B 4009, Fugaoxin 11, Xieshangwu Gao 24) high-strength GH4169 alloy compressor disc forgings.

Q 3B 4054 (RJTO10, Fugaoxin 10, Xieshangwugao 23) direct aging GH4169 alloy compressor disc forgings.

Q 3B 4050 (Q 5B 4037, Fugaoxin 9, Xieshangwu Gao 32) GH4169 alloy thick plates, sheets and strips.

Q 3B 4052 GH4169 alloy capillary.

The mechanical properties of materials refer to the mechanical characteristics of materials when they are subjected to various external loads (tensile, compression, bending, torsion, impact, alternating stress, etc.) in different environments (temperature, medium, humidity).

Chinese name mechanical properties.

Nature phenomenon. Characteristics refer to the material in different environments.

Advantages: Brittleness, strength,