1. Ib qho nruab nrab quenching
Lub workpiece yog txias rau hauv ib qho nruab nrab, xws li dej quenching thiab roj quenching. Qhov zoo yog kev ua haujlwm yooj yim, kev siv tshuab yooj yim thiab siv dav. Qhov tsis zoo yog tias nws tsuas yog ib qho txias ceev xwb.
2. Dual nruab nrab quenching
Lub workpiece yog txias txog li 300 degrees Celsius nyob rau hauv ib tug nruab nrab nrog muaj zog txias muaj peev xwm, thiab ces txias nyob rau hauv ib tug nruab nrab uas tsis muaj zog cua txias peev xwm, xws li dej quenching thiab ces roj quenching, uas yuav ua tau zoo txo qhov kev ntxhov siab nyob rau hauv martensitic transformation thiab txo qhov nyiam ntawm workpiece deformation thiab tawg. Nws tuaj yeem siv rau quenching workpieces nrog cov duab nyuaj thiab qhov tsis sib xws. Qhov tsis zoo ntawm dual nruab nrab quenching yog tias nws tsis yooj yim los tuav lub sijhawm ntawm kev hloov dual nruab nrab. Yog hais tias qhov hloov dua siab tshiab yog ntxov dhau, nws yooj yim rau quench nyuaj, thiab yog tias qhov hloov dua siab tshiab lig dhau lawm, nws yooj yim rau quench thiab tawg. Txhawm rau kom kov yeej qhov tsis zoo no, cov txheej txheem quenching qib tau tsim.
3. Qib quenching
Lub workpiece yog quenched nyob rau hauv ib tug tsawg-kub ntsev da dej los yog alkali da dej rauv. Qhov kub ntawm cov ntsev da dej lossis alkali da dej yog nyob ze ntawm Ms point. Lub workpiece nyob ntawm qhov ntsuas kub no rau 2-5 feeb thiab tom qab ntawd muab tshem tawm rau cua txias. Txoj kev txias no yog hu ua graded quenching. Lub hom phiaj ntawm kev ua kom txias txias yog ua kom qhov kub thiab txias sab hauv thiab sab nraud ntawm qhov chaw ua haujlwm zoo sib xws, thiab tib lub sijhawm ua kom muaj kev hloov pauv martensitic, uas tuaj yeem txo qis kev ntxhov siab thiab tiv thaiv kev deformation thiab tawg. Qhov ntsuas kub tau dhau los tau teeb tsa me ntsis siab dua qhov Ms point. Tom qab qhov kub thiab txias sab hauv thiab sab nraud ntawm lub workpiece yog sib xws, nws nkag mus rau hauv martensitic cheeb tsam. Tam sim no nws tau raug txhim kho mus rau qhov ntsuas kub me ntsis qis dua qhov Ms point. Kev xyaum qhia tau hais tias cov txiaj ntsig ntawm kev muab qhab nia hauv qab Ms point yog qhov zoo dua. Piv txwv li, high-carbon steel pwm yog graded quenched nyob rau hauv ib tug alkali da dej ntawm 160 degrees Celsius, uas yuav hardened thiab deformed tsawg, yog li nws yog dav siv.
4. Isothermal quenching
Lub workpiece yog quenched nyob rau hauv ib tug isothermal ntsev da dej. Cov ntsev da dej kub yog nyob rau hauv qis ntawm bainite (me ntsis siab dua Ms). Lub workpiece nyob twj ywm isothermally rau lub sij hawm ntev kom txog thaum lub bainite transformation tiav thiab muab tawm rau cua txias. Austempering yog siv rau nruab nrab carbon steel thiab saum toj no kom tau txais qis bainite los txhim kho lub zog, hardness, toughness thiab hnav tsis kam. Tsawg carbon steel feem ntau tsis raug rau austempering.
round steel tube
