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Discussion Forums - The Hendrix Group
HomeHomeDiscussionsDiscussionsMaterial Select...Material Select...Cracking after heat treatment of parts made from 1215 sCracking after heat treatment of parts made from 1215 s
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3/7/2006 9:00 AM
 
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Lately we are having an issue with some parts that are made from 1215 steel. These are carbonitrided to RKW 15N 85 min, furnace tempered, oil quenched, with an effective case depth of 0.30mm. The parts are subsequently sized, at which time they fracture at a milled area. Does anyone have any suggestions/answers in regard to a possible cause? We have made these parts from the same material, with the same heat treatment, and same sizing process, for several years. How much would the Ni/Cu content of the 1215 material affect its hardenability? Are we just having a hydrogen embrittlement issue?
 
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6/14/2006 9:00 AM
 
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Does the heat treatment include a tempering cycle after quench. Even a low temp. temper such as 300 to 350 DF for 4 hours would greatly increase ductility and should reduce or elininate cracking. A carbonitrided case is very resistent to temper and after a temper of 1000 DF case hardness will be above 50 HRC. Something else to examine is the method of raw material manufacture. Ie. was the past material made with the ingot cast method and the new failing material made with continious cast method. Additionally, it may be possible to hard turn the parts after heat with ceramic inserts. Good luck! Regards Fritzcoinc
 
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