Views: 0 Author: Annie Publish Time: 2023-07-14 Origin: Site
This is an article one after 30 Questions About Heat Treatment（1） that answers another 10 asked questions about heat treatment, here is the catalogue of these 10 questions.
11.Briefly describe the principles of sensor design.
12.What basic principles should designers consider when choosing materials?
13.What process performance should I consider when choosing metal materials to manufacture parts?
17.Explain the type, purpose and purpose of the ball retreat?
20.Point out the type of alloys.
11. Briefly describe the principles of sensor design.
1. The coupling distance between the sensor and the workpiece should be as close as possible.
2. For the workpiece of heating by the outer wall of the coil, the drove must be added.
3. Avoid sharp angle effects on the design of a sharp-angle sensor.
4. Avoid offset the magnetic line.
5. The sensor design should try to meet the workpiece when heating.
12. What basic principles should designers consider when choosing materials?
1. According to the working conditions of the parts, including load types and size, environmental conditions, and main failure modes, etc.
2. Consider factors such as the structure, shape and size of the parts. For those who are prone to quenching distortion and cracking, the quenchtability is better.
3. Understand the tissue and performance after the thermal treatment of the material, and some of the steel types developed for various thermal treatment process methods, the tissue and performance of the processing will be better;
4. Under the premise of ensuring the performance and life of parts, try to simplify the heat treatment process, especially the material that can be saved.
13. What process performance should I consider when choosing metal materials to manufacture parts?
1. Casting performance.
2. Pressure processing performance.
3. Mechanical processing performance.
4. Welding performance.
5. Thermal treatment process performance.
14. How many types of grinding loss are effective? How to prevent all kinds of grinding loss of parts?
Type of wear: adhesion, grinding particle wear, corrosion wear, contact fatigue.
Prevention method: For adhesion and wear, reasonably select friction and side matching materials; use surface treatment to reduce friction coefficient or improve surface hardness; reduce contact pressure stress; reduce surface roughness. For abrasive wear, in addition to reducing contact pressure and sliding friction at the first level to improve lubricating oil filtering device to clear the abrasives, high -hardness materials should be reasonably selected; Material surface hardness. For corrosion and wear, choose antioxidant materials; surface coating; choose corrosion -resistant materials; electrochemical protection; reduce stress concentration of stress on the design of slow erosion; Change the media conditions. To expose fatigue, increase the hardness of the material; improve the purity of the material, reduce the mixed objects; increase the strength and hardness of the part of the parts; reduce the surface roughness of the parts; increase the viscosity of lubricating oil to reduce the oil wedge.
15. What are the basic processes of steel's chemical heat treatment? What are the main ways to describe the accelerated chemical heat treatment? What are the superiority of the carburizing segmentation control process? Usually, what is the tissue of the surface layer and the heart of low-carbon steel carburizing after quenching?
Decomposition, adsorption, diffusion three steps. The application of segmented control method, composite seepage treatment, high temperature diffusion, new materials that accelerate the diffusion process, chemical seepage, physical seepage; prevent the surface of the workpiece from oxidation, facilitate the spread, fully coordinate the three processes, reduce the formation of carbon on the surface of the workpiece to form charcoal formation charcoal The process of black, accelerate the process of carburizing, and ensure that the transition layer has a wide and smooth high-quality penetration layer; from the surface to the heart of the heart, the analysis, the analysis of the common Assembly, the analysis of the co-in Asia, and the analysis of the primitive Asia.
It is composed of block (equivalent) iron and high -carbon regions.
17. Explain the type, purpose and purpose of the ball retreat?
Ordinary retreat: Increase hardness, improve the cutting of cutting, and reduce quenching distortion.
Isothermal sphere retreat: It is used for high -carbon tool steel and alloy tool steel.
Circulation Global Retreat: For carbon tool steel, alloy tool steel.
18. The quenching temperature of the Assembly steel is often selected above AC3, and why is the co-analysis steel quenching heating temperature between AC1-ACM? Try theoretically analyzing it in theory?
1. Due to the low content of the Assembly steel, the original tissue P+F. If the quenching temperature is lower than AC3, there will be an unclean F, and the soft point will appear after quenching. For over-analyzed steel, if the temperature is too high, too much K'dissolved, which increases the amount of chip M, it can easily cause deformation and cracking, increase the amount of A ', dissolve too much K' Reduction.
2. For over-analyzed steel temperature, the tendency of oxidation and decarbolization increases, making the surface component of the steel uneven, MS is different, resulting in quenching and cracking.
3. Selecting the quenching temperature AC1+(30-50 ° C) can retain the unloading K 'to improve the wear resistance, reduce the carbon content of the substrate, and increase the strength and toughness of the steel.
19. The new process of low-temperature and high temperature recovery of high-speed steel will increase the life of high-speed steel quenching back?
Uniformly explains ε and M3C to make M2C, MC is more evenly explained within the range of the secondary hardening temperature, promoting some residual Octobic transformations into benis, and improving strong toughness.
20. Point out the type of alloys.
ZL104: cast aluminum, MB2: Magnesium alloy, ZM3: Magnesium casting, TA4: α titanium alloy, H68: brass, QSN4-3: tin brass, QBE2: Be brass, TB2: β titanium alloy.
