How to improve the pogo pin spring structure is spring factory

pogo pin spring
Cnomax pogo pin factory engineer will tell you about the steel matrix organization structure on the influence of the delayed fracture after hydrogen content, from the hydrogen in the solubility, diffusion speed, the formation of hydrogen in steel trap density, depth and filling degree of Angle analysis, austenitic steel for maximum hydrogen embrittlement resistance and almost do not produce delayed fracture.Ferritic steel in acidic environments, such as H2S, formic acid, acetic acid, hydrogen embrittlement tendency obvious, but did not see have delayed fracture, may be related to ferritic steel tensile strength is low, cannot be used in high stress conditions.For the high strength spring, delayed fracture resistance is closely related to the microstructure structure, delayed fracture resistance from strong to weak organizational structure in the order: sorbite, pearlite, bainite and martensite.Martensite structure internal stress, high dislocation density, there are a lot of microcrack micro cracks (article number n/was as high as 1000 ~ 2000), very conducive to hydrogen diffusion and aggregation, extremely easy to cause delayed fracture.High strength carbon spring steel wire sorbite with fibrosis organization, internal stress distribution is relatively uniform, weak hydrogen embrittlement tendency, maximum delay fracture resistance.Alloy spring used in quenching tempering, as quenching organization, single martensite structure for maximum delayed fracture resistance of martensite + bainite mixing times, under the upper bainite or pearlite + martensite mixed group delayed fracture resistance decreased significantly, so 60 si2mna spring quenching when necessary to ensure hardening, obtain a single martensitic structure, can not have upper bainite and pearlitic structure.

After quenching in spite of the high strength and hardness of the spring elastic limit fell sharply, but a serious shortage of plasticity and toughness, must increase the elastic limit by tempering, to get enough plasticity and toughness.At 60 si2mna spring as an example, after oil quenching spring within a lot of stress, such as not timely tempering can make internal micro crack extension to macroscopic crack, to temper won't help at this time.According to the test, after quenching spring microcrack per square millimeter of 1500 ~ 2000, with around 200 ℃ tempering, microscopic crack down to a number of every square millimeter 500 or so, to improve the tempering temperature, the micro cracks article number has no obvious change, began to significantly reduce until above 600 ℃.From the microscopic structure, around 200 ℃ tempering tempering martensite structure, spring smaller, microcrack number decreased significantly, the number of hydrogen traps is obviously reduced;Tempering temperature up to 250 ~ 350 ℃, the spring into the temper brittleness zone 1, carbide precipitation in the martensite phase boundary, thin sheet, the residual austenite is relatively stable, but when the cooling back into martensite, increase the number of hydrogen traps and, instead, delay fracture of spring sensitivity enhancement;Tempering temperature up to 250 ~ 350 ℃, gain tempered troostite organization, spring delayed fracture resistance improved significantly;To that above the tempering temperature to 600 ℃, internal stress released in full, martensite completely decomposed into granular sorbite, spring delayed fracture resistance to achieve the best level.

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Thread Pogo pin

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Cnomax Electronics co.,Ltd.

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