Ausforming heat treatment process
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Ausforming is a heat treatment process which integrates quenching, hardening, soaking, tempering and plastic deformation process.
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Ausforming heat treatment process
- 1. AUSFORMING P R E S E N T E D B Y: Snehal Chaudhari 22020092 253064 Nikhil Nagdev 22020291 253070 Shubham Bhojane 22020154 253072 Tanmay Barge 22020171 253073 SCE PRESENTATION ON Under guidance of Prof. (M.s) S. V. Dravid BRACT’S, Vishwakarma Institute of Information Technology, Pune-48
- 2. Content: 1. Heat Treatment 2. Types of heat treatment 3. Ausforming 4. How it is done 5. Types of ausforming process 6. Ausforming process variables 7. Case Study of ausforming process 8. Advantages 9. Applications
- 3. So our topic is ausforming which is a hardening process, well before going into deep let’s dig some basics. Heat Treatment What is? So heat treatment is basically heating and cooling of a “manufactured material” to obtain the desired properties of materials. The temperature up to which the material can be heated depends upon the type of material and after heating the main process i.e. cooling is done. In heat treatment the cooling is like art. How the cooling is done will defines the properties of materials. During cooling the micro structure get’s changed which results in change in physical properties. Important terms in heat treatment: 1. Soaking: During cooling the material is maintained at constant temperature for some time, the process called as soaking, and the time for which it maintained at constant temperature is called soaking time. 2. Quenching: For cooling sometimes water or oil is used as cooling medium, so keeping of material in such kind of cooling medium called as quenching.
- 4. Heat treatment Annealing In annealing the temperature is maintained at constant temperature and then cooled inside the furnace due to which the cooling rate is very slow. (Increase ductility, remove thermal stresses and reduce hardness) Normalizing In normalizing the temperature is increased and soaked for some time then it is cooled in air. (Gives strength and hardness to material and also remove internal stresses) Hardening In hardening after increasing temperature and soaking the material is directly quenched in oil bath or water bath. (It increases hardness of material but makes the material brittle) Tempering Tempering is done after hardening. In this the material is heated to lower temperature soaked and then cooled in air (it maintains the required hardness of material and increase its ductility)
- 5. Annealing Normalizing Hardening TTT Curve showing different heat treatment process
- 6. Temperature bands for heat treatment process
- 7. Ausforming Now coming to our main discussion point “Ausforming”, which is basically a type of hardening process which integrates tempering, rapid cooling, deforming and quenching. It is a modified steel heat treatment process in which plastic deformation of metastable austenite is done. In the ausforming process first the material is heated to a particular temperature (generally above Ac3 line), soaked at that temperature for some time then the material is rapidly cooled below nose of TTT curve. After cooling up to particular temperature the mechanical work is done on material by forging and rolling, the temperature is maintained constant during mechanical working. Then again it is cooled. The water or salt bath is used as quenching / cooling medium. How ausforming process is done?
- 8. Ausforming Process on TTT curve
- 9. Types of ausforming process 1. HTMT ausforming process In this the deformation is done at high temperature mainly above Ac1 and Ac3 line, due to which it is called as higher temperature mechanical treatment ausforming process. 2. LTMT ausforming process In this the deformation is done at Low temperature mainly below Ac1 and Ac3 line, due to which it is called as lower temperature mechanical treatment ausforming process.
- 10. Ausforming process variables 1. Austenitizing temperature: It should be as low as possible just to obtain stable austenite without causing grain growth, this results in finer structure. If the austenitizing temperature is kept high it causes the problem of oxidation. 2. Rate of cooling from Austenitizing temperature to deformation temperature: It should be enough to avoid the formation of ferrite during cooling. Even the cooling from deformation temperature to room temperature should be fast enough to avoid the formation of bainite.
- 11. Ausforming process variables 3. Temperature of deformation: You can see in diagram as the temperature of deformation is lowered, more is the strain hardening of austenite which results in higher strength after ausforming. The temperature should at least be low enough not to allow recovery and recrystallization.
- 12. Ausforming process variables 4. Amount of Deformation: The graph shows the relation between the deformation and the strength of material. The more the deformation is carried on material the more strength is obtained.
- 13. Case study of Ausforming process Condition Brinell Hardness value Compression strength Yield strength Fatigue strength Sample Without Ausforming 301 1447 689 0.46 With Ausforming 356 1671 960 0.58
- 14. Advantages of ausforming process 1. It increases the compressive as well as the yield strength of material 2. It provides some ductility to alloy steel 3. It makes material with finer grains 4. Increase the harness of material 5. It increase wear resistance properties. 6. It improves fatigue strength of material
- 15. Applications of Ausforming Process 1. Vehicle suspension system 2. Torsion bars 3. Coil springs 4. Punches 5. Dies 6. Cutting tools 7. Shears 8. High strength bolts 9. Aircraft parts such as landing gears, high strength forgings and structural panels 10.Agricultural parts and earth moving equipment's.
- 16. Conclusion • It may be concluded from the above discussions, that ausforming is a highly effective means of achieving high strength, improved fatigue strength, superior fracture toughness and greater wear steels, as well provide good ductility.
- 17. Reference's Material Science And Metallurgy For Engineers by V.D.Kodgire https://www.slideshare.net/ https://www.youtube.com/ https://www.engineeringenotes.com