4130 dimensional change in heat treatment
4130 dimensional change in heat treatment
(OP)
We have a cast 4130 part that we quench and temper to RC 44-48. How much will the material grow or shrink in heat treatment? Is there a reference which tabulates growht and shrinkage of various steels in heat treatment? Thanks





RE: 4130 dimensional change in heat treatment
There are many factors that will affect this behavior, so I know of no reference that would give such information. If there was one, I wouldn't trust it.
For a start, you can figure that any dimension may grow or shrink by as much as 1%. It will probably be less, but it could be more, depending. Like I said, you can start with 1% and adjust your process as necessary depending on actual results.
rp
RE: 4130 dimensional change in heat treatment
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RE: 4130 dimensional change in heat treatment
RE: 4130 dimensional change in heat treatment
There are significant volumetric changes that occur during the heat treating process, however, and these changes will result in distortion. That is, the dimensions will change. In some directions, they will increase (grow), and in others, they will decrease (shrink), as indicated in my first response. Which dimensions will grow and which ones will shrink all depends on a myiad of factors that you will never be able to satisfactorly account for.
The only "rule of thumb" that I am aware of is that you will generally see less than +/- 1%. That is, if a pre-heat treat dimension is 1.000", after heat treatment you can expect it to be between 0.990 and 1.010". Now, I have seen considerably higher amounts of distortion, but these are generally special case instances for long bars with very high length to diameter ratios or rings with high daimeter to thickness ratios. But, as a general rule, +/- 1% is a good place to start.
rp
RE: 4130 dimensional change in heat treatment
Thanks
RE: 4130 dimensional change in heat treatment
rp
RE: 4130 dimensional change in heat treatment
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