cracking occured in en 19 shafts after induction hardening
cracking occured in en 19 shafts after induction hardening
(OP)
Dear all
we manufacture rock shaft for tractors. material EN 19 with hardened n tempered with hardness 30 -35 HRC.after finishing we have to do induction hardening the splines and required case hardness 45-50 HRC case depth 2-3 mm..After induction hardening we are getting 55 to 57 hrc quench hardness.Recently we found cracking occurred in some shafts immediate after induction hardening.does adding polymer 5% will solve this problem?
regards
we manufacture rock shaft for tractors. material EN 19 with hardened n tempered with hardness 30 -35 HRC.after finishing we have to do induction hardening the splines and required case hardness 45-50 HRC case depth 2-3 mm..After induction hardening we are getting 55 to 57 hrc quench hardness.Recently we found cracking occurred in some shafts immediate after induction hardening.does adding polymer 5% will solve this problem?
regards





RE: cracking occured in en 19 shafts after induction hardening
RE: cracking occured in en 19 shafts after induction hardening
A search performed has listed some good discussions. Link is provided below. Hope it is useful.
http://www.eng-tips.com/search.cfm?pid=330&act...
"Even,if you are a minority of one, truth is the truth."
Mahatma Gandhi.
RE: cracking occured in en 19 shafts after induction hardening
Another issue that is often overlooked is the temperature of the part after it leaves the quench. Cooling below 175C does not improve the hardness, but does increase the cracking tendency. Most of the quench systems are set-up with timers. If so, when determining the process parameters for each part size, pay attention to the post-quench temperature and if it is close to room temperature, adjust the quench time to target 150C or so. You will also find you get less drag-out of the quenchant since it will drain faster off a hotter piece of material.
RE: cracking occured in en 19 shafts after induction hardening
RE: cracking occured in en 19 shafts after induction hardening
RE: cracking occured in en 19 shafts after induction hardening
of lately we are having this problem .picture attached for ur ref.. we have 10 to 15% polymer added.earlier we were not facing this problem.. out of 200pcs lot 10 pcs break from the exact position..
regards
RE: cracking occured in en 19 shafts after induction hardening
RE: cracking occured in en 19 shafts after induction hardening
RE: cracking occured in en 19 shafts after induction hardening