Method for evaluating welding degree of hole type defect in forge piece

A technology of internal holes and evaluation methods, applied in the direction of testing the strength of materials by applying a stable bending force, to achieve the effect of convenient sampling, simple operation, and loose sample size requirements

Inactive Publication Date: 2012-09-05
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Application Information

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Problems solved by technology

[0005] In view of the above problems existing in the process of simulating the welding degree of internal hole-type defects in forgings by the current two-sample butt joint method, the purpose of the present invention is to provide an evaluation method for the welding degree of internal hole-type defects in forgings

Method used

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  • Method for evaluating welding degree of hole type defect in forge piece
  • Method for evaluating welding degree of hole type defect in forge piece
  • Method for evaluating welding degree of hole type defect in forge piece

Examples

Experimental program
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Effect test

Embodiment 1

[0029] The experimental material 34MnV steel is processed into a small cylinder of Φ8×12mm, and the end surface roughness of the sample is Ra0.8. The surface of the processed sample was cleaned with acetone, and the sample docking experiment was carried out on a thermal simulation testing machine according to the preset deformation temperature of 1200 °C, holding time of 28 minutes and strain of 0.24. In the experiment, the heating rate was 5°C / s, the temperature soaking time was 5s, and the strain rate was 0.01s. -1 , the strain is 0.24, the pressure at both ends of the sample during the heat preservation stage is 5MPa, and the air cooling is completed after the heat preservation.

[0030] The butt joint samples after the experiment were cut into bending samples as shown in Figure 3, and a three-point bending test was carried out ( Figure 4 ). The bending strength of the obtained bending sample is 2170MPa, and the bending strength of the intact sample is 2600MPa, the weldi...

Embodiment 2

[0032] The experimental material 34MnV steel is processed into a small cylinder of Φ8×12mm, and the end surface roughness of the sample is Ra0.8. The surface of the processed sample was cleaned with acetone, and the sample docking experiment was carried out on a thermal simulation testing machine according to the preset deformation temperature of 1100 °C, holding time of 14 minutes and strain of 0.06. In the experiment, the heating rate was 5°C / s, the temperature soaking time was 5s, and the strain rate was 0.01s. -1 , the strain is 0.06, the pressure at both ends of the sample in the heat preservation stage is 5MPa, and the air cooling is completed after the heat preservation.

[0033] The butt joint samples after the experiment were cut into bending samples as shown in Figure 3, and a three-point bending test was carried out ( Figure 4 ). The bending strength of the obtained bending sample is 1950MPa, and the bending strength of the intact sample is 2600MPa, the welding d...

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Abstract

The invention belongs to field of the physical simulation technology of the material hot processing, and in particular relates to a method for evaluating the welding degree of a hole type defect in a forge piece. The method comprises the following steps of: (1) processing experimental materials into a cylinder, wherein the roughness of the end surface of a sample is Ra6.3-Ra0.4; cleaning the surface of the processed sample with acetone, carrying out the sample butt joint experiment on a thermal simulation tester according to the preset deformation temperature, the thermal preservation time and the strain; butting the end surfaces of two samples so as to butt two surfaces with closed cracks in the butt joint end surface simulation forge piece during the sample butting experiment; and (2) cutting the butted samples into bent samples after the experiment, and presenting the welding degree of a hole type defect in the forge piece by the specific value of the bending strength of the bent samples and the bending strength of the complete samples. The method disclosed by the invention is not influenced by the sample interface state, the precision of an observation apparatus, the selection position and the like, a three-point bending experiment is used to evaluate the welding effect of the butted samples. The requirements on the size of the samples are loose, and the method is convenient to sample and is easy to operate.

Description

Technical field: [0001] The invention belongs to the technical field of material thermal processing physical simulation, in particular to a method for evaluating the degree of welding of hole-type defects inside a forging. Background technique: [0002] Some forgings, especially large forgings, are directly forged from ingots or billets. Due to the large size of large ingots or billets, the quality is difficult to control, and there are many defects in them, such as segregation, inclusions, shrinkage cavities, and porosity. The existence of hole-type defects such as porosity seriously affects the performance of forgings. Forgings with hole-type defects after forging will even be directly scrapped, resulting in significant economic losses. Through the forging process, defects inside the ingot or billet can be improved or even eliminated. Therefore, it is one of the important purposes of forging to eliminate hole-type defects such as porosity through large plastic deformatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/20
Inventor 程明张士宏阚盈宋鸿武
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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