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Chemical milling method of K423A cast superalloy without intergranular corrosion

A high-temperature alloy and chemical milling technology, applied in the field of chemical milling, can solve the problems of intergranular corrosion, high sensitivity to intergranular corrosion, and affect the high-temperature tensile strength, creep strength and durable strength of K423A alloy, and achieve surface The effect of good flatness, small surface roughness and precise size

Inactive Publication Date: 2013-12-18
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, K423A alloy is very sensitive to intergranular corrosion during chemical milling in strong acidic environment. Intergranular corrosion will occur in the process of chemical milling with conventional nickel-based superalloy chemical milling corrosion fluid, which seriously affects the K423A alloy. High temperature tensile strength, creep strength and enduring strength

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Example 1: (1) Ultrasonic degreasing: The formula for ultrasonic degreasing to remove oil stains on the surface of the test piece:

[0012] Sodium dodecylbenzenesulfonate (C 18 h 29 NaO 3 S) 8g / L

[0013] Sodium Lauryl Sulfate (C 12 h 25 SO 4 Na) 2g / L

[0014] Alcohol (C 2 h 5 OH) 40ml / L

[0015] Temperature 50°C

[0016] Ultrasonic vibration power: 1.2kw

[0017] Ultrasonic vibration time until exhausted

[0018] After the parts are degreased, they are thoroughly washed with water, and then the continuity of the water film on the surface of the parts is checked. If the surface of the whole part is hydrophilic, there are no water drops and non-wetting parts, it is considered that the degreasing is qualified;

[0019] (2) Activation: remove the oxide film formed on the surface of K423A superalloy, make the surface in an activated state, and provide a good surface for chemical milling. The parameters of the activation process are: hydrochloric acid 9.7mol / L, ...

Embodiment 2

[0023] Embodiment 2: (1) Ultrasonic degreasing: the formula of ultrasonic degreasing to remove the oil stain on the surface of the test piece:

[0024] Sodium dodecylbenzenesulfonate (C 18 h 29 NaO 3 S) 10g / L

[0025] Sodium Lauryl Sulfate (C 12 h 25 SO 4 Na) 4g / L

[0026] Alcohol (C 2 h 5 OH) 40ml / L

[0027] Temperature 50°C

[0028] Ultrasonic vibration power: 1.2kw

[0029] Ultrasonic vibration time until exhausted

[0030] After the parts are degreased, they are thoroughly washed with water, and then the continuity of the water film on the surface of the parts is checked. If the surface of the whole part is hydrophilic, there are no water drops and non-wetting parts, it is considered that the degreasing is qualified;

[0031] (2) Activation: remove the oxide film formed on the surface of K423A superalloy, make the surface in an activated state, and provide a good surface for chemical milling. The parameters of the activation process are: hydrochloric acid 9.7m...

Embodiment 3

[0036] (1) Ultrasonic degreasing: Ultrasonic degreasing formula for removing oil stains on the surface of the test piece:

[0037] Sodium dodecylbenzenesulfonate (C 18 h 29 NaO 3 S) 9g / L

[0038] Sodium Lauryl Sulfate (C 12 h 25 SO 4 Na) 3g / L

[0039] Alcohol (C 2 h 5 OH) 40ml / L

[0040] Temperature 50°C

[0041] Ultrasonic vibration power: 1.2kw

[0042] Ultrasonic vibration time until exhausted

[0043]After the parts are degreased, they are thoroughly washed with water, and then the continuity of the water film on the surface of the parts is checked. If the surface of the whole part is hydrophilic, there are no water drops and non-wetting parts, it is considered that the degreasing is qualified;

[0044] (2) Activation: remove the oxide film formed on the surface of K423A superalloy, make the surface in an activated state, and provide a good surface for chemical milling. The parameters of the activation process are: hydrochloric acid 9.7mol / L, hydrofluoric acid...

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Abstract

The invention provides a chemical milling method of K423A cast superalloy without intergranular corrosion. The chemical milling method is characterized in that a composite addition agent is added to a chemical milling working fluid, so that after being subjected to chemical milling machining, the K423A alloy has a smooth and sound surface without intergranular corrosion. The chemical milling method comprises the following steps of (1) removing oil by using ultrasonic waves; (2) activating; (3) carrying out chemical milling machining; and (4) carrying out aftertreatment. The chemical milling method has the advantage that after the K423A alloy is subjected to chemical milling machining, the metal surface with small surface roughness, good surface evenness and accurate size and without allowance and intergranular corrosion can be obtained.

Description

technical field [0001] The invention relates to a chemical milling method, in particular to a chemical milling method for K423A cast superalloy without intergranular corrosion. Background technique [0002] K423A superalloy is a nickel-based cast superalloy developed by my country. It has the characteristics of high strength, good oxidation resistance and fatigue resistance, and stable structure. It is suitable for making hollow (or solid) guide blades or Integral cast guide. The use of chemical milling can remove unnecessary material in specific areas of guide vanes or cast guides, remove waste weight of parts to the greatest extent, reduce the overall quality of the aircraft and ensure the accuracy of parts dimensions, and expose and eliminate surface defects of cast parts. However, K423A alloy is very sensitive to intergranular corrosion during chemical milling in strong acidic environment. Intergranular corrosion will occur in the process of chemical milling with convent...

Claims

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Application Information

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IPC IPC(8): C23F1/26C23F1/04
Inventor 赵晴陈四兵杜楠林翠刘刚
Owner NANCHANG HANGKONG UNIVERSITY
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