Shock absorption properties better from casting or forging?

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Discussion Overview

The discussion centers around the shock absorption properties of cast versus forged steels, specifically in the context of components used under the chassis of heavy trucks on bumpy roads. Participants explore the suitability of each method for this application, considering factors such as material properties and manufacturing processes.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant inquires about which type of steel, cast or forged, provides better shock absorption for heavy truck chassis components.
  • Another participant suggests that forging may be better for shock absorption but expresses uncertainty and provides links to external resources for further reading.
  • A third participant clarifies that they are specifically looking for a steel bar, not steel wheels, indicating a need for more targeted information.
  • A later reply discusses the general properties of steels, noting that both cast and forged steels are not particularly good at shock absorption, with cast iron being mentioned for its ability to absorb shocks due to granular carbon inclusions.
  • This reply also highlights that casting may result in fewer internal strains, while forging has a lower chance of defects, suggesting that both methods can yield similar results with proper machining and heat treatment.
  • Reference to a specific material (E295) is provided as a common choice for axles and shafts, indicating a potential starting point for the discussion.

Areas of Agreement / Disagreement

Participants express differing views on the shock absorption capabilities of cast versus forged steels, with no consensus reached on which method is definitively better for the specified application.

Contextual Notes

The discussion lacks detailed specifications about the setup and requirements for the steel component, which may influence the conclusions drawn. Additionally, the effectiveness of shock absorption may depend on various factors, including material composition and treatment processes.

ayush sood
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Hi
I want to ask which of the cast steels or forged steels provide with better shock absorption?
The component has to be used in the under chassis of heavy trucks in bumpy roads.
Can anyone help me with that?

Thank You
 
Last edited:
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Thank You for your reply. But I am not looking for steel wheels
I am looking for a steel bar that has to be used under the chassis of heavy vehicles.
 
Hi Ayush,

Your question is quite general in nature and a detailing your setup will help answers.
Shock absorption means you hit the material at one end and the shock wave gets strongly dissipated and absorbed to the point that it dies out in a long enough slab.
Steels, cast or forged are not in general very good at "shock absorption", as they do not dissipate a shock wave too much.
The main reason some types of cast iron were and still are used in chassis construction is it's ability to absorb shocks by their granular carbon inclusions.
This is why I would ask if your steel part needs to absorb shocks or just withstand them?

If you have to choose between casting or forging, casting will leave less internal strains while forging has a smaller chance of defects, yet both methods can yield similar results after proper machining and heat treatment.

For a starting reference google a DIN EN 10025-2 table. E295 (aka. 1.0050) is used for axles, shafts and seems common and cheap.
 

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