What are common heat treatment defect spring?

What are common heat treatment defect spring? Appear problem, we will handle the following spring manufacturer spring gave you talk about common heat treatment defects and corresponding prevention measures. Defects: carburizing to play yellow performance harm: low fatigue service life. Defects caused by reason: 1, gas quenching furnace heating did not maintain gas. 2, salt bath deamination *. Avoid countermeasures: 1, gas quenching furnace heating should be maintain the gas or drops of organic chemistry, aqueous solution, cementation furnace heating, salt bath should be deamination, residue scores less than 0. 2%. 2, improve performance inspection of raw material process. 2: after quenching hardness is not enough to play yellow performance harm: cause residual deformation, reduce life. Defects caused by reason: 1, the austenitic organization. 2, ferrite core. 3, quenching heating temperature is low. 4, quenching medium refrigeration capacity was poor. Avoid countermeasures: 1, USES the stainless steel plate with good cutting performance. 2, improve the cooling of quenching medium. 3, play wong to quenching medium temperature should be around AR3. 4, moderately improve quenching heating temperature. 5, improve after quenching for alloy composition test. Split three defects: to play yellow performance harm: ductility, serious could reduce. Defect: 1, high heating temperature or quenching medium refrigeration work capacity is too large. 2, surface carburizing. 3, quenching is not immediately. Avoid countermeasures: quenching heating temperature. 1, time under strict control. 2, using isothermal quenching or hardening austenitic grade classification. 3, in quenching medium cold take off air cooling to 250 ~ 300 oc. 4, quenching immediately after quenching. To play yellow performance defect 4: overtemperature harm: crystal, ductility. Defects caused by reason: 1, quenching heating temperature is too high. 2, heat molding temperature is too high. Avoid countermeasures: 1, according to the appropriate temperature quenching process experiments. 2, moderately reduce heat molding temperature. 3, improve the dashboard review to ensure that the temperature measurement precision.
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