1: Dab tsi yog qhov tseem ceeb ntawm metallurgical khoom tsim nyog rau kev tsheb ciav hlau clip steel?
Railway clip steel yuav tsum muaj lub zog tensile siab (1,500-2,000 MPa) thiab qaug zog ua haujlwm. Cov khoom siv yuav tsum muaj qhov zoo-grained microstructure tiav los ntawm kev tswj dov thiab quenching. Charpy cuam tshuam qhov tseem ceeb yuav tsum tshaj 27J ntawm -40℃rau huab cua txias. Cov tshuaj muaj pes tsawg leeg yog tswj nruj, nrog silicon (1.5-2.0%) thiab manganese (0.6-0.9%) ua cov ntsiab lus tseem ceeb alloying. Cov khoom no raug txheeb xyuas los ntawm kev puas tsuaj ntawm cov qauv batch.
2: Cov txheej txheem kho cua sov cuam tshuam li cas rau kev ua haujlwm clip?
Austenitizing ntawm 850-880℃ua raws li cov roj quenching tsim cov qauv martensitic. Tempering ntawm 400-450℃restores toughness thaum tuav hardness. Induction hardening tsuas yog siv rau qhov chaw sib cuag nkaus xwb. Kev kho cua sov tsis raug tuaj yeem ua rau decarburization lossis quench tawg. Cov txheej txheem tsis yog digitally nkag rau traceability.
3: Cov kev tswj xyuas zoo li cas yog siv thaum clip forging?
Ultrasonic kuaj pom cov voids sab hauv hauv billets ua ntej forging. Tuag kub yog khaws cia ntawm 200-300℃los tiv thaiv thermal shock. Forging presses siv 6,000-10,000 tons ntawm lub zog rau cov nplej kom zoo. Dimensional checks siv laser scanners nrog ± 0.1mm kam rau ua. Txhua forging batch muaj xws li daim coupons xeem rau mechanical validation.
4: Vim li cas txhaj tshuaj peening tseem ceeb rau kev tsheb ciav hlau clips?
Kev txhaj tshuaj peening induces compressive stresses (txog -600 MPa) nyob rau hauv txheej txheej. Qhov no txuas ntxiv lub neej qaug zog los ntawm 30-50% piv rau cov clips tsis kho. Kev txhaj tshuaj hlau nrog 0.6mm txoj kab uas hla feem ntau yog siv ntawm 6-8 bar siab. Kev pab them nqi raug txheeb xyuas siv Almen strips thiab 200% yam tsawg kawg nkaus sib tshooj. Cov txheej txheem kuj tshem tawm nplai los ntawm kev kho cua sov.
5: Yuav ua li cas clips kuaj rau hydrogen embrittlement txaus ntshai?
Cov qauv raug ncua ncua kev sim tsis ua haujlwm nyob rau hauv kev thauj mus los (75% ntawm cov khoom tawm). Cov ntsiab lus hydrogen yog ntsuas los ntawm kev siv roj chromatography (<0.2 ppm allowed). Baking at 200°C for 24 hours removes diffusible hydrogen. ASTM F519 specifies the testing protocol. Failed samples show characteristic intergranular fractures.