O que é tratamento térmico?

Os tratamentos térmicos são utilizados de forma ideal nas linhas de produção, como forma de melhorar metais ou liga propriedades. Existem diversas maneiras de alterar as características do material através de aquecimento e resfriamento controlados.: eles podem ser dificultados, mais forte, mais dúctil, e resistente ao desgaste, e rasgar, de acordo com um trabalho específico. Às vezes nas oficinas de fabricação, o termo 'tratamento térmico' refere-se amplamente ao processo de alívio de tensão de soldas, flexão, ou formando. O alívio do estresse ajuda a eliminar o estresse interno, produzido durante a fabricação. Então, isso torna o material forte e estável sob tensão.

Tratamento térmico: Por que é importante?

O tratamento térmico melhora a resistência, dureza, bem como resistência geral do metal, especialmente aço. Sem isso, a peça de metal usada em automóveis, aviões, e as ferramentas mecânicas não seriam tão fortes ou tão duradouras. Geralmente, Metais que são tratados termicamente são mais resistentes ao desgaste e à corrosão do que aqueles que não são tratados termicamente..

O tratamento térmico é preferido porque melhora a resistência e a resistência dos metais e, como resultado, as frequências de substituição e manutenção são minimizadas. Isto faz com que as máquinas funcionem de forma eficiente e reduz os custos e isto é muito crucial em áreas como a indústria aeroespacial e automóvel, onde a segurança é um factor importante..

Tipos comuns de tratamento térmico

Os tratamentos térmicos mais comumente empregados incluem:

• Carburismo
• Nitretagem
• Endurecimento & Temperamento
• anelamento
• Criogenia
• Normalização

Principais etapas do processo de tratamento térmico

Geralmente há três etapas envolvidas no tratamento térmico:

• Aquecimento: Os metais são reaquecidos a uma determinada temperatura dependendo do que se deseja alcançar. This temperature may differ depending on the metal used as well as the process involved and can go up to 2400°F (1300°C) em alguns casos.
• Soak Time: The metal is kept at the target temperature for a given time to change its internal structure. Loosening the control of soak time results in changes in the microstructure of the metal.
• Resfriamento: Cooling can either be fast (têmpera) or slow depending on the characteristics that the material being cooled needs to possess. Quenching can transform the metal to its hardened state whereas slow cooling may increase toughness or diminish the measure of brittleness.

Quais metais podem ser tratados termicamente?

Heat treatment is commonly used to improve the surface properties of various metals, como força, dureza, e resistência à corrosão. Below is a list of metals frequently subjected to heat treatment processes:

• Steel and Steel Alloys
• Aço inoxidável
• Alumínio
• Cobre
• Latão
• Titânio
• Ligas de Níquel

Considerações para tratamento térmico

Let’s highlight the factors that ensure successful heat treatment and the desired material properties.

• Surface Roughness: Some heat treatment operations such as hardening and tempering may raise the surface roughness, and therefore the parts may need to be polished to the required standard (por exemplo., moagem).
• Costs: The cost of heat treatment is influenced by the process adopted, the material to be treated, and the production volume. Por exemplo, annealing is cheaper than hardening since the cooling process is slower and the equipment required is not as much.
• Material-Specific Temperatures: Every material has the right temperature for heating and cooling. Heating and cooling curves of metals are given by metallurgists which gives the exact requirements to temper the metals. Nesse caso, manufacturers depend on accurate heat treatment processes to enable them to deliver products that work as expected in different environments. One treatment type is used to increase the hardness of the metal or alloy to meet certain operational requirements while another is used to refine the flexibility of the metal or liga.

Perguntas frequentes – Tratamento térmico

1º trimestre. Heat treatment of metals – can all metals be heat treated?

Não, metals have different reactions depending on their chemical structure and grain structure. Ferrous metals such as steel are generally expected to exhibit good behavior, whereas some non-ferrous metals may need surface treatments.

2º trimestre. Is heat treatment costly?

The cost varies with the method, the type of furnace to be used, and the material to be coated. Although such processes as vacuum or induction hardening could be rather costly, the improvement of the mechanical properties leads to effective cost-effectiveness in the long run.

3º trimestre. Is it possible to do heat treatment from home?

Industrial heat treatments involve accurate control of temperature which may range above 1000°F and require a specific atmosphere to prevent oxidation. Some of these could be undertaken without the necessary gear leading to a destruction of property or pose serious risks.

4º trimestre. What should be taken into consideration when selecting the proper heat treatment?

No entanto, it is dependent on the mechanical properties. These include hard, dúctil, or tensile strength as well as the type of alloy under treatment. Referring to material standards or carrying out phase diagram analysis enables one to make a decision.

Q5. Is heat treatment reversible?

Não, heat treatment is not reversible. Once a material undergoes heat treatment, its internal structure and properties are permanently altered.

Notas finais

While some heat treatments such as annealing or tempering may reverse the previous hardening process by changing the grain structure, some other heat treatments may permanently alter the properties of the metal, and therefore selection must be done carefully.

Heat treatments are widely used in different branches of industry, as they play an important role in the characteristics of metal products. From the cars we drive to the buildings we depend on, heat treatment improves the characteristics of the materials, tornando -os mais fortes, more resistant, and more durable. Portanto, it’s important to understand the specific parameters necessary to accomplish goals related to processes such as annealing, hardening, and tempering among others.

We hope this discussion provided useful information on the role of heat treatment in today’s manufacturing. If you have any questions or if you need professional advice, you can ask us at www.topsbest-precision.com.