Is there a ASTM method for estimating grain size in welds? 3

• Mar 30, 2004

1
• #2

metengr

Materials

Oct 2, 2003

15,478

US

EngineerDave;
From the publications I have seen, the ASTM method E112 (intercept or other) for determination of grain size can be applied to wrought or cast product forms. Welds would be considered a cast product form.

 

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• Mar 30, 2004

1
• #3

unclesyd

Materials

Aug 21, 2002

9,819

US

I never seen a grain size on as welded product due it being mostly dendritic.

 

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• Mar 30, 2004

• #4

metengr

Materials

Oct 2, 2003

15,478

US

unclesyd;
Yes, I have never seen welds have a grain size identified for components we purchase. On the other hand, I don't see why you couldn't attempt to determine an average grain size using the intercept method where you would have a columnar grain structure instead of all dendrites.

As a side note, I did see a technical paper where the weld grain size was determined using the intercept method, which caught my attention. It must have been an academic exercise.

 

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• Mar 30, 2004

• Thread starter
• #5

EngineerDave

Bioengineer

Aug 22, 2002

352

US

Thanks guys. The dendritic structure and absence of clear boundaries are exactly my problem. I just finished explaining that to my customer.

I'll let you know if we give it a try. I would use my image analysis software and an intercept method.

 

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• Mar 30, 2004

1
• #6

TVP

Materials

Apr 12, 2002

4,592

US

Dave,

FYI, there are a number of ASTM methods that discuss grain size including the following:

ASTM E 1382 Standard Test Methods for Determining Average Grain Size Using Semiautomatic and Automatic Image Analysis

ASTM E 930 Standard Test Methods for Estimating the Largest Grain Observed in Metallographic Section (ALA Grain Size)

ASTM E 1269 Standard Practice for Assessing the Degree of Banding or Orientation of Microstructures

You may want to consider more than just an intercept technique, for the reasons already stated.

 

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• Mar 30, 2004

• #7

sayee1

Materials

Feb 6, 2003

281

SA

My only contribution to this post were the stars!!!!

Thanks and regards
Sayee Prasad R
Ph: 0097143968906
Mob: 00971507682668
email: sayee_prasad@yahoo.com
If it moves, train it...if it doesn't move, calibrate it...if it isn't written down, it never happened!

 

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