Cov nyhuv ntawm qhov kub thiab txias tempering ntawm microstructure thiab mechanical zog ntawm hnav-resistant phaj
Nrog rau txoj kev loj hlob ntawm tag nrho cov hom kev tshawb fawb tej yaam num nyob rau hauv lub ntiaj teb no mus rau qhov tob thiab nce ntawm reaming txoj kab uas hla, lub zog ntawm drilling cuab yeej yog loj thiab complex, thiab high-hardenability alloy tempered structural steel yog feem ntau xaiv. Hnav-resistant phaj yog ib hom hlau alloy hnav-resistant steel, uas muaj lub zog siab tom qab kev hloov kho, thiab muaj cov yas zoo thiab tawv, thiab tau siv dav hauv kev tsim cov cuab yeej loj-inch drilling. Raws li cov neeg kho tshuab cov khoom yuav tsum tau hnav-resistant phaj alloy steel raws li cov khoom siv drilling hauv kev tshawb nrhiav: tensile lub zog siab tshaj 1033MPa, hardness siab dua 321HBW, longitudinal impact absorption zog KV2 Ntau dua los yog sib npaug rau 90J, qhov kev ua haujlwm no kawm txog cov teebmeem ntawm qhov sib txawv. kub kub tempering kub ntawm lub microstructure thiab mechanical zog ntawm hnav-resistant phaj.
Cov khoom siv sim yog cov khoom seem ntawm cov khoom siv roj av loj loj annealed hnav-tiv taus phaj, qhov loj yog 60mm × 60mm × 125mm, cov nplej loj yog ASTM4.0 , thiab cov ntsiab lus tseem ceeb (wt%) yog: 0.333C, 0.977Cr, 2.45Ni, 0.469Mo, 0.{2{{22 }}}}902V, 0.212Si, 0.559Mn, 0.0054P, 0.0015S. Lub austenitic cua sov kub ntawm cov qauv coj-resistant phaj yog 880 degree, lub tshav kub preservation yog 2h roj txias, thiab cov qauv tau tempered ntawm 560, 590, 620 thiab 650 degree raws li tom qab quenching, thiab lub tshav kub preservation yog 2h dej txias. Raws li GB / T2975, txiav cov qauv tensile thiab cov qauv cuam tshuam ntawm qhov sib thooj ntawm cov hlau bar. Tensile xeem raws li GB / T228 tus qauv; Kev ntsuas cuam tshuam raws li GB / T229 tus qauv. Kev ntsuas hardness yog ua los ntawm DHB-3000 Brinell hardness tester raws li GB/T231-2012 tus qauv. Lub pob steel txoj kab uas hla yog 10 hli, lub siab yog 29.4kN, thiab tuav load yog 15s. Lub microstructure ntawm metallographic kuaj tau pom los ntawm AE2000MET inverted metallographic microscope tom qab sib tsoo ua ntej, polishing thiab etching nrog 3% nitrate cawv tov rau 10 ~ 15s.
Cov txiaj ntsig tau pom tias lub microstructure ntawm daim hlau hnav-tiv taus tom qab quenching ntawm 880 degree thiab tempering ntawm 560 ~ 650 degree yog tempered sorbite + flake lossis loj ferrite + carbide. Hnav-resistant phaj muaj lub zog zoo heev thiab kev sib tw zoo tom qab tempering ntawm 620 degree; Tom qab tempering ntawm 560 degree, chav tsev kub lub zog thiab Brinell hardness ncav cuag qhov siab tshaj plaws, thiab qhov cuam tshuam nqus zog ntsuas yog qhov qis tshaj, thaum qhov rov qab muaj tseeb tom qab tempering ntawm 650 degree. Nrog rau qhov nce ntawm tempering kub, lub zog tensile, tawm los lub zog thiab hardness ntawm lub phaj hnav maj mam txo, thiab qhov cuam tshuam nqus zog maj mam nce. Xav txog lub zog thiab plasticity ntawm cov khoom, tom qab tempering lub phaj hnav-resistant ntawm 560 ~ 650 ° C, 620 ° C yog qhov zoo tshaj plaws tempering kub rau lub phaj hnav-resistant raws li ib tug loj txoj kab uas hla tshwj xeeb drilling cuab yeej rau mining.
