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

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

Inactive Publication Date: 2015-04-15
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Description
  • Claims
  • 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

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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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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. The heating rate in the experiment is 5°C / s, the soaking time is 5s, and the strain rate is 0.01s -1 , strain 0.24, the pressure at both ends of the sample during the heat preservation stage is 5MPa, and air-cooled after the heat preservation is over.

[0030] The butt joint sample after the experiment was cut into a bending sample as shown in Figure 3, and a three-point bending test was carried out ( Figure 4 ). The bending strength of the bent sample is 2170MPa, while the bending strength of the intact sample is 2600MPa, then the welding degree η of the internal hole defect i...

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. The heating rate in the experiment is 5°C / s, the soaking time is 5s, and the strain rate is 0.01s -1 , strain 0.06, the pressure at both ends of the sample during the heat preservation stage is 5MPa, and air-cooled after the heat preservation is over.

[0033] The butt joint sample after the experiment was cut into a bending sample 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, while the bending strength of the intact sample is 2600MPa, then the welding degree η of the internal h...

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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 physical simulation of thermal processing of materials, in particular to an evaluation method for the welding degree of internal hole-type defects in forgings. Background technique: [0002] Some forgings, especially large forgings, are directly forged from steel ingots or billets. Due to the large size of large steel ingots or billets, the quality is difficult to control, and there are many defects inside them, such as segregation, inclusions, shrinkage cavities, porosity, etc. Porosity and other hole-type defects seriously affect the performance of forgings, and forgings with hole-type defects after forging may even be scrapped directly, causing 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 porosity and other hole-type defects through large plastic ...

Claims

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Application Information

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Patent Type & Authority Patents(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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