Unlock instant, AI-driven research and patent intelligence for your innovation.

Preparation method of bearing steel large sample electrolytic sample

A technology for bearing steel and large samples, applied in the field of test sample preparation, can solve problems such as affecting the accuracy of experimental results, flaky metal shedding, and increasing working strength, so as to prevent lamellar metal shedding on the surface of the sample , Improve accuracy and reduce labor intensity

Inactive Publication Date: 2019-03-12
HANDAN IRON & STEEL GROUP +1
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of electrolyzing the bearing steel sample, there will be sheet-like metal falling off from the surface of the electrolytic sample, which seriously affects the accuracy of the experimental results and increases the work intensity.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method of bearing steel large sample electrolytic sample
  • Preparation method of bearing steel large sample electrolytic sample
  • Preparation method of bearing steel large sample electrolytic sample

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0012] The preparation method of the bearing steel large-scale electrolytic sample of the present invention adopts the following process: (1) Sampling: On the rolled material, cut a cuboid rough sample of 65 ± 5 mm × 65 ± 5 mm × (180-200) mm, or a diameter Cylindrical rough sample with a diameter of 65±5mm and a length of 180-200mm.

[0013] (2) Spheroidizing annealing: heat the crude sample with the heating furnace, heat it to 790-810°C, and keep it warm for 3-6 hours; then cool it with the furnace (with the furnace door closed), and the cooling rate is preferably 20-60°C / h; After the furnace temperature drops to 650°C or below, take it out and air cool it.

[0014] (3) Post-treatment: Car polish or polish the surface of the coarse sample after spheroidizing annealing until the surface finish is at least ▽6; then degrease with a degreasing agent (ethanol, acetone or carbon tetrachloride), and then use a volumetric Wash the surface with a dilute HCl solution with a ratio of 1...

Embodiment 1

[0015] Embodiment 1: The method for preparing a large electrolytic sample of bearing steel according to the present invention is specifically described as follows.

[0016] (1) On the GCr15 rolled material, cut two cylindrical rough samples with a diameter of 65mm and a length of 190mm at the same position along the rolling direction, and mark them as 1 and 2 respectively.

[0017] (2) Spheroidizing annealing treatment: Put the crude sample 2 into the heating furnace, heat it up to 800°C with the furnace, and then start to keep it warm, keep it at 800°C for 4 hours, and cool it with the furnace (furnace door closed), the cooling rate is 40~60℃ / h, when the furnace temperature drops to 650℃, take it out and air cool.

[0018] (3) The surface of rough sample 2 after spheroidizing annealing and rough sample 1 without annealing was polished to a surface roughness of ▽8, then degreased with a degreasing agent, and then dilute HCl solution with a volume ratio of 1:4 Clean the surfac...

Embodiment 2

[0022] Embodiment 2: The preparation method of the bearing steel large sample electrolysis sample of the present invention is specifically described as follows.

[0023] (1) On the GCr18Mo rolled material, cut two 70mm×65mm×180mm cuboid rough samples at the same position along the rolling direction, and mark them as 1 and 2 respectively.

[0024] (2) Spheroidizing annealing treatment: Put the crude sample 2 into the heating furnace, heat it up to 810°C with the furnace, then start to keep it warm, keep it at 810°C for 6 hours, and cool it with the furnace (furnace door closed), the cooling rate is 20~40°C / h, when the furnace temperature drops to 630°C, take it out and cool it in air.

[0025] (3) The rough sample 2 after spheroidizing annealing and the rough sample 1 without annealing were polished to a surface roughness of ▽6, then degreased with a degreasing agent, and then dilute HCl solution with a volume ratio of 1:5 Clean the surface to make a large cuboid electrolytic ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a preparation method of a bearing steel large sample electrolytic sample. The preparation method comprises the steps that a coarse sample is taken from a bearing steel material, the coarse sample is subjected to spheroidizing annealing, and then is smoothened on a lathe or polished, and therefore the sample can be obtained; the spheroidizing annealing process is that the coarse sample is heated to 790-810 DEG C along with a furnace, kept for 3-6 hours at the temperature, then cooled to 650 DEG C or below along with the furnace, and taken out for air cooling. After spheroidizing annealing is adopted in the method, the sample structure is transformed from lamellar pearlite into spherical pearlite, and surface lamellar metal of the sample is effectively prevented fromfalling off in the electrolysis process. According to the bearing steel large sample electrolytic sample prepared by adopting the method, the surface lamellar metal of the sample can be effectively prevented from falling off in the electrolysis process, the experiment result accuracy is improved, and the labor intensity is lowered.

Description

technical field [0001] The invention relates to a method for preparing a testing sample, in particular to a method for preparing a large electrolytic sample of bearing steel. Background technique [0002] Known as the "joint of high-end equipment", bearings are one of the most important key basic parts. The main failure modes of bearings are contact fatigue failure and wear failure, among which contact fatigue failure plays a dominant role. When the bearing is working under load, the inclusions in the bearing steel will become the source of stress concentration cracks, which is the main cause of fatigue failure. Inclusions are extremely harmful, so it is urgent and important to study the behavior of inclusions in bearing steel. [0003] The large sample electrolysis method is a very effective method for evaluating large inclusions in steel, and it is also one of the irreplaceable large inclusion analysis methods so far. It is mainly used to analyze inclusions larger than 5...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G01N1/32G01N1/44
CPCG01N1/32G01N1/44
Inventor 周丹靖振权巩彦坤丁剑高福彬何璞史进强
Owner HANDAN IRON & STEEL GROUP