Manganese (Hadfield) steel precipitation when welding?
Manganese (Hadfield) steel precipitation when welding?
(OP)
When welding large hadfield castings, several months later we encounter cracking and chipping (loss of material) in/near the weld zone.
Situation: Hadfield castings, loaded in severe shock loads.
Repair weld of worn zones by a butter layer of 307, followed by welding of high-manganese elektrode (same material as base material) (both SMAW).
grinding before welding, followed by dye testing.
Trying to keep interpass temps below 200 C (400 F).
Any ideas what the aligned black lines are you can see in the grains? is that already carbide precipitation?

Picture is upside down: top part is base material (Hadfield), below you'll see first layer of 307.
PS this has already been briefly discussed here: thread 329658
any other ideas about above picture or ideas/suggestions about welding Hadfield castings?
Situation: Hadfield castings, loaded in severe shock loads.
Repair weld of worn zones by a butter layer of 307, followed by welding of high-manganese elektrode (same material as base material) (both SMAW).
grinding before welding, followed by dye testing.
Trying to keep interpass temps below 200 C (400 F).
Any ideas what the aligned black lines are you can see in the grains? is that already carbide precipitation?

Picture is upside down: top part is base material (Hadfield), below you'll see first layer of 307.
PS this has already been briefly discussed here: thread 329658
any other ideas about above picture or ideas/suggestions about welding Hadfield castings?





RE: Manganese (Hadfield) steel precipitation when welding?
RE: Manganese (Hadfield) steel precipitation when welding?
I will check the test piece again to see to which distance from the fusion line these paraller lines occur.
RE: Manganese (Hadfield) steel precipitation when welding?
RE: Manganese (Hadfield) steel precipitation when welding?
Those lines are called deformation twin bands in english.
It can be formed close to the weld due to thermal stresses. It's hard to say without further information if its due it because those can be formed during solidification or heat treatment as well.
RE: Manganese (Hadfield) steel precipitation when welding?
I am unable to view the picture to offer any comment.
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"It's better to die standing than live your whole life on the knees" by Peter Mayle in his book A Good Year
RE: Manganese (Hadfield) steel precipitation when welding?
typical : .07 % C - 18% Cr - 8% Ni - 6%Mn - .85% Si - low levels of P and S
picture attached again.
RE: Manganese (Hadfield) steel precipitation when welding?
would you still care to comment?
RE: Manganese (Hadfield) steel precipitation when welding?
I am battling with a customer for breakage of 2 toggle plates . Castings are good ,no internal defects and the material is cast iron.Any reasons, you may suggest?
_____________________________________
"It's better to die standing than live your whole life on the knees" by Peter Mayle in his book A Good Year
RE: Manganese (Hadfield) steel precipitation when welding?
RE: Manganese (Hadfield) steel precipitation when welding?
Why the 307?
If you are overlaying with matching chemistry the 307 will just form a layer with much different thermal expansion.
How do railroads repair crossings and switch frogs? They weld on Mn steel castings all of the time.
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Plymouth Tube
RE: Manganese (Hadfield) steel precipitation when welding?
_____________________________________
"It's better to die standing than live your whole life on the knees" by Peter Mayle in his book A Good Year
RE: Manganese (Hadfield) steel precipitation when welding?
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Plymouth Tube
RE: Manganese (Hadfield) steel precipitation when welding?
Nevertheless, I appreciate your comments.
Different thermal expansion coëfficiënts do not really matter as the delta temp is limited to 50-60 degrees C at most, and since they're both austenitic of nature, the difference isn't that big.
What is the matter with the grain boundaries?
RE: Manganese (Hadfield) steel precipitation when welding?
RE: Manganese (Hadfield) steel precipitation when welding?
RE: Manganese (Hadfield) steel precipitation when welding?
I think that the grind back for prep is critical.
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Plymouth Tube