Nyob rau hauv xyoo tas los no, nrog rau kev loj hlob sai ntawm kuv lub teb chaws txoj kev lag luam, qhov kev thov rau stainless hlau tau nce ntxiv, thiab qhov kev thov muaj zog tau tsav qhov kev nthuav dav sai ntawm kuv lub teb chaws stainless hlau ntau lawm. Tab sis tib lub sij hawm, peb lub teb chaws yog ib lub teb chaws tsis muaj cov khoom siv nickel thiab chromium, yog li nws tseem ceeb heev los tsim thiab tsim cov nickel-txuag stainless hlau. 1Mn5Cr10NiMo steel yog ib tug tsawg-nickel martensitic stainless hlau ua los ntawm Mn hloov Ni. Cov hlau no tuaj yeem siv rau hauv thaj chaw uas tsis muaj kev tiv thaiv corrosion tsis dhau. Ib qho kev kawm tseem ceeb ntawm cov txheej txheem kev kho cua sov, hardness, thiab cov qauv ntawm cov hlau no muaj qhov tseem ceeb qhia qhov tseem ceeb rau nws tom qab ua thiab siv.
Cov hlau siv rau kev xeem yog 1Mn5Cr10NiMo steel bar tau los ntawm dov thiab txias kos duab tom qab smelting lub ingot los ntawm hluav taws xob rauv smelting + VOD + sab nraud refining txheej txheem. Txoj kab uas hla yog Φ46mm. Tom qab annealing, tus qauv yog tempered martensite. Cov txheej txheem annealing yog 820 degree × 20h. Rauv txias, hardness 360 ~ 385HB, nws cov tshuaj muaj pes tsawg leeg yog qhia nyob rau hauv Table 1. Tom qab ib txwm high-temperature annealing, lub hardness ntawm cov hlau yog siab heev, uas ua rau muaj teeb meem loj nyob rau hauv tom qab txiav ua.
Sampling txias-draw annealed tuav tau quenched thiab tempered los kawm txog cov kev hloov ntawm hardness, qauv thiab txhua yam khoom. Cov txheej txheem tshwj xeeb yog raws li hauv qab no: ① Xaiv 9 pawg ntawm cov qauv thiab tuav lawv ntawm 9 qhov ntsuas kub ntawm 1050 thiab 350 degree rau 1 teev thiab tom qab ntawd quench. Los ntawm nws cov kev hloov pauv hardness thiab cov qauv kev hloov pauv, nws qhov tseem ceeb ntawm qhov hloov pauv kub tuaj yeem txiav txim siab kwv yees. ② Raws li theem tseem ceeb ntawm kev hloov pauv kub tau txiav txim siab hauv kauj ruam 1, xaiv 5 pawg ntawm cov qauv thiab tuav lawv ntawm 960 degree rau 1 teev thiab tom qab ntawd cua txias. Lawv tau tuav ntawm 750-580 degree rau 2 teev thiab tom qab ntawd txias hauv qhov cub rau kev kho kom sov los kawm txog lawv cov kev hloov pauv hardness thiab cov khoom siv tshuab.
Cov txiaj ntsig qhia:
(1) Ar1 ntawm 1Mn5Cr10NiMo steel yog nyob ib ncig ntawm 750 degree, thiab Ar3 yog 900 degree. Noj rau hauv tus account lub zog ntawm superheat, cov txiaj ntsig ntawm kev suav yog qhov tseem ceeb raws li qhov tseem ceeb ntawm kev ntsuas kub ntawm hypoeutecoid alloy hlau. Ar1 thiab Ar3 yog ze li 20 qis dua Ac1 thiab Ac3. degree.
(2) During tempering, there is secondary hardening in the high temperature section (>630 degree). Raws li tempering kub nce, lub hardness nce. Qhov thib ob hardening feem ntau yog vim muaj kev sib zog ua kom muaj zog ntawm precipitated carbides, uas txhim kho lub zog ntawm cov hlau. , lub hardness kuj nce.
(3) Xav txog lub zog tensile thiab cuam tshuam kev ua tau zoo, tempering ze 690 degree muaj lub zog siab tshaj plaws thiab cuam tshuam kev ua haujlwm, thiab qhov hardness yog li 302HBW. Tempered qhov chaw hauv qab 600 degree yuav muaj kev pheej hmoo ntawm kev tawg tawg, yog li qhov kub thiab txias yuav tsum siab tshaj 600 degree.
