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Quality inspection method of ductile iron

A technology for ductile iron and quality inspection, which is applied in the direction of measuring devices, preparation of test samples, optical testing for flaws/defects, etc., can solve problems such as inability to accurately inspect the quality of ductile iron pistons, and achieve simple, feasible and practical quality inspection methods Strong, quality-enhancing effect

Active Publication Date: 2021-11-23
CNR LANZHOU LOCOMOTIVE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a method for inspecting the quality of ductile iron to overcome the problem that the existing inspection method cannot accurately inspect the quality of the ductile iron piston

Method used

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  • Quality inspection method of ductile iron
  • Quality inspection method of ductile iron
  • Quality inspection method of ductile iron

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] This embodiment provides a quality inspection method for ductile iron, which is used to inspect the quality of the ductile iron piston, including:

[0041] Extract the sample to be tested on the ductile iron piston;

[0042] Using nitric acid ethanol solution to process the sample to be tested;

[0043] Using a microscope to observe the graphite spheres of the sample to be tested and the aggregation state of ferrite around them;

[0044] The mass of the nodular cast iron piston is determined according to the aggregation state of the graphite ball and its surrounding ferrite in the sample to be tested.

[0045] Generally, for ductile iron parts with low performance requirements, the aggregation state of graphite balls and surrounding ferrite in the metallographic structure will generally not affect the performance of the part, but when ductile iron is used as a piston, its work Conditions are extremely bad, and the aggregation state of graphite balls and ferrite around...

Embodiment 2

[0064] This embodiment provides a quality inspection method for ductile iron, which is used to inspect the quality of the ductile iron piston, including:

[0065] Extract the sample to be tested on the ductile iron piston;

[0066] Specifically, the body of the ductile iron piston was dissected, and some samples were selected as samples to be tested.

[0067] Using nitric acid ethanol solution to process the above-mentioned samples to be tested;

[0068] Specifically, the sample to be tested is subjected to corrosion treatment in 4% nitric acid ethanol solution, and the treatment time is 30s.

[0069] Use a microscope to observe the aggregation state of graphite balls and surrounding ferrite in the corroded sample to be tested;

[0070] Among them, the microscope is an optical microscope, and the aggregation state of the graphite ball and the surrounding ferrite of the sample to be tested is observed at 400 times.

[0071] Determine the mass of the nodular cast iron piston ...

Embodiment 3

[0074] This embodiment provides a quality inspection method for ductile iron, which is used to inspect the quality of the ductile iron piston, including:

[0075] Extract the sample to be tested on the ductile iron piston;

[0076] Wherein, the sample to be inspected is taken from the ductile iron block for manufacturing the ductile iron piston to be inspected.

[0077] Using nitric acid ethanol solution to process the above-mentioned samples to be tested;

[0078] Specifically, the sample to be tested is subjected to corrosion treatment in 4% nitric acid ethanol solution, and the treatment time is 50s.

[0079] Use a microscope to observe the aggregation state of graphite balls and surrounding ferrite in the corroded sample to be tested;

[0080] Among them, the microscope is an optical microscope, and the aggregation state of the graphite ball and the surrounding ferrite of the sample to be tested is observed at 400 times.

[0081] Determine the mass of the nodular cast i...

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Abstract

The invention provides a method for inspecting the quality of ductile iron, which is used for inspecting the quality of ductile iron pistons, comprising: extracting a sample to be inspected from the piston of ductile iron; using nitric acid ethanol solution to process the sample to be inspected; using a microscope to observe the graphite of the sample to be inspected The aggregation state of the ball and its surrounding ferrite; according to the aggregation state of the graphite ball and its surrounding ferrite of the sample to be tested, the quality of the nodular cast iron piston can be determined, so as to provide a basis for the quality of the ductile iron casting to improve the corresponding product the quality of. In particular, through the above inspection method, the quality of the nodular cast iron piston of the diesel locomotive engine can be improved, and the breakage or failure of the nodular cast iron piston can be avoided.

Description

technical field [0001] The invention relates to a material performance analysis technology, in particular to a quality inspection method of nodular cast iron. Background technique [0002] Due to the advantages of high strength, good fatigue performance, good shock absorption, good lubrication performance, relatively simple manufacturing process, high elastic modulus, excellent and stable high temperature performance and relatively low linear expansion coefficient, etc., ductile iron has become the current The main material of the piston of high-power diesel locomotive diesel engine. [0003] Due to the increased power of diesel locomotives and the harsh working environment of pistons, ductile iron pistons are prone to breakage and other forms of failure, resulting in locomotive failures. Therefore, the inspection of the quality of the ductile iron piston is the premise to avoid its fracture and failure. At present, the metallographic inspection items of nodular cast iron ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/88G01N1/32
CPCG01N1/32G01N21/8803
Inventor 李硕张君赵飞朱凤德
Owner CNR LANZHOU LOCOMOTIVE