Class 5 Boiler Practice Exam

Which of the following statements is true regarding stress relieving in heat treatment?

1. It is not related to any form of heat treatment

2. It is used exclusively for steel materials

3. It can help in reducing residual stresses in materials

4. It should only be performed in liquid form

The correct answer is: It can help in reducing residual stresses in materials

Stress relieving is a heat treatment process that is specifically designed to reduce residual stresses in materials. These residual stresses can occur due to welding, machining, or other manufacturing processes and can negatively affect the material's performance, leading to deformation or failure under load. When a material is heat treated for stress relieving, it is heated to a specific temperature and then allowed to cool slowly. This controlled heating and cooling process enables the internal stresses to redistribute and reduce the overall stress levels in the material, improving its dimensional stability and mechanical properties. The other statements do not hold true regarding stress relieving. Stress relieving is not unrelated to heat treatment; in fact, it is a crucial component of various heat treatment processes. Additionally, while it is common in steel materials, stress relieving is not exclusive to them and can be applied to other materials as well. Lastly, stress relieving is carried out in solid form rather than liquid form, making the statement that it should only be performed in liquid form inaccurate.