Creep is a huge issue for high temperature components

Replication inspection

The operating life of high temperature components is naturally shorter than you would expect for parts in kinder environments. Creep is the biggest issue here. The heat puts a lot of stress on the parts, causing permanent deformation. In time it can cause stress ruptures and failure. It is vital to monitor the products here to keep an eye on the remaining operating life. Replication inspection is the best option.

When will creep start to happen?

It is important to look at when creep will begin happening and when it will become a major issue. The thing to keep in mind is that the onset will differ depending on the specific alloy you are using. For example, carbon steel can begin deforming when it reaches 800 degrees Fahrenheit. Stainless steel on the other hand has higher thermal resistance so it won’t begin until it is 1,050 degrees Fahrenheit.

What you should do is look at the specific materials you are using for the components. Then you need to factor in the environment and the operating temperature. These details can give you a rough idea of when creep can start.

The creep curve

It is also worth noting that creep progresses as a curve. This happens in the following stages;

  • When the metal reaches the temperature when deformation can begin, there will be a fast initial extension of the part.
  • A primary period of creep will follow, creating a steep curve.
  • Then there will be a secondary period where the expansion will be slower but quite constant. This is where the creep can progress slowly over the operating life of the part.
  • Finally, there will be another period where the creep accelerates prior to failure. This happens due to the damage to the microstructure that has occurred to this point.

Using replication inspection

Format NDT Ltd understands how important it is to monitor high-temperature components to reduce the risk of a failure. Whether it is a boiler, a heat exchanger, pipes, or other products, we offer great services. The best option is replication because it is non-destructive and you can do it in situ. This means less downtime and a faster turnaround. The method is also an effective way of measuring creep.

So, if you need replication inspection for any kind of high-temperature products, please contact us. We can prepare surfaces carefully and give you a full report of our findings. They can reveal the extent of the creep damage and give an idea of remaining operating life.