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Re: NDT before or after annealing of tubular products

Posted by: Mehmet Bal (PID_1807), E-mail: malibal@tr.net, on December 16, 2003 at 08:50 :

In Reply to: Re: NDT before or after annealing of tubular products posted by : Daniel Rice , E-mail: danrice@uersw.com, on December 16, 2003 at 07:01 :

Dear Mr. AMSNDT,
I can reference you ASTM E 1444-Magnetic Particle Examination Section 5-5: Examnination Sequence-When Magnatic Particle examination is specified it shall be performed after the completetion of operations that could cause surface or near surface defects. These operations include, but are not limited to, forging, heat treating, ...I hope that will help.
Good lucks
Mehmet Bal
----------- Start Original Message -----------
: : Dear Mr. AMSNDt,
: : I did my final project in college about Failure Analysis of Dryer Shell Cracking. The research was done by checking the fracture, test the chemical composition, and simulate the cyclic thermal (Heat Treatment/HT) in the laboratory.
: : At HT variations (temperature & time), I simulated my specimen by quenching treatment every time after my HT is done. I also took macro & micro photographs, and then counted its boundary size using OPTIMAS 2000 computer program. To check the chemical composition, I used spectrophotometer testing.
: : Believe it or not... the result is that chemical composition now has different compared to the original one --> I think material selection is not available.
: : One thing I want sharing in this case of my final project result: HT simulation shows that increasing of thermal cyclic, temperature, and heating time causing reduction of ductility ---> This phenomena known as embrittlement.
: : Rgrds & God Bless
: :
: : : Can someone please direct me to a Standard or Practice that clearly states that NDT should be performed after HT processes or does it matter
: : : Thanks
: ASTM A609 States as most, ASTM standards inspection that the product should be inspected in the finished heat treated state.
: I have learned the following, the finished heat treated state may induce cracking if improperly performed, or interupted. The heat treatment source may or may not know of the interuption or quenching of a improper heat treatment.
: Example a supervisor, pulled heat treatment 1 hour early, which probably would have been ok! but, it was raining and the roof leaked where the fork truck driver placed the large wrought 4140 die casting. And, yes the die hardened, instead of softening, and the volosity increased,making a class 2 die a class 3 die.
: Therefore with the liability of NDT and the political aspects of inspection. I would hope that inspection could be performed after final heat treatment. After all it is Nondestructive, right!!
------------ End Original Message ------------

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----------- Start Original Message ----------- : Dear Mr. AMSNDT, : I can reference you ASTM E 1444-Magnetic Particle Examination Section 5-5: Examnination Sequence-When Magnatic Particle examination is specified it shall be performed after the completetion of operations that could cause surface or near surface defects. These operations include, but are not limited to, forging, heat treating, ...I hope that will help. : Good lucks : Mehmet Bal : : : Dear Mr. AMSNDt, : : : I did my final project in college about Failure Analysis of Dryer Shell Cracking. The research was done by checking the fracture, test the chemical composition, and simulate the cyclic thermal (Heat Treatment/HT) in the laboratory. : : : At HT variations (temperature & time), I simulated my specimen by quenching treatment every time after my HT is done. I also took macro & micro photographs, and then counted its boundary size using OPTIMAS 2000 computer program. To check the chemical composition, I used spectrophotometer testing. : : : Believe it or not... the result is that chemical composition now has different compared to the original one --> I think material selection is not available. : : : One thing I want sharing in this case of my final project result: HT simulation shows that increasing of thermal cyclic, temperature, and heating time causing reduction of ductility ---> This phenomena known as embrittlement. : : : Rgrds & God Bless <dave> : : : : : : : Can someone please direct me to a Standard or Practice that clearly states that NDT should be performed after HT processes or does it matter : : : : Thanks : : ASTM A609 States as most, ASTM standards inspection that the product should be inspected in the finished heat treated state. : : I have learned the following, the finished heat treated state may induce cracking if improperly performed, or interupted. The heat treatment source may or may not know of the interuption or quenching of a improper heat treatment. : : Example a supervisor, pulled heat treatment 1 hour early, which probably would have been ok! but, it was raining and the roof leaked where the fork truck driver placed the large wrought 4140 die casting. And, yes the die hardened, instead of softening, and the volosity increased,making a class 2 die a class 3 die. : : Therefore with the liability of NDT and the political aspects of inspection. I would hope that inspection could be performed after final heat treatment. After all it is Nondestructive, right!! ------------ End Original Message ------------

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