Sib piv cov Hardness Gradient ntawm Rail End Hardening nrog rau Hnav Resistance ntawm Joint Area
Vim li cas thiaj sib cais qhov kawg -quenching yuav tsum tau rau cov cheeb tsam tsheb ciav hlau?
Rail pob qij txha tiv taus lub log hnyav tshaj plaws - kev cuam tshuam kev tsheb ciav hlau, ua rau muaj kev kub ntxhov sai sai - zaus poob siab thaum tsheb ciav hlau hla. Lub hauv paus hardness ntawm cov ntsia hlau ib txwm tsis tuaj yeem tiv taus qhov cuam tshuam rov qab mus ntev -, ua rau lub taub hau crushing thiab spalling. Xaus-quenching tshwj xeeb txhim kho qhov tawv tawv ntawm thaj chaw sib koom ua ke, txhim kho kev hnav tsis kam. Yog tias tsis muaj quenching, sib koom ua ke tus nqi tuaj yeem yog 3-5 npaug siab dua lub cev tsheb ciav hlau, ua rau muaj kev cuam tshuam loj heev rau kev taug qab. Yog li, qhov kawg-quenching yog ib qho kev kho mob tseem ceeb rau kev sib koom ua ke.
Dab tsi ua rau tuag taus tshwm sim los ntawm qhov tsis tsim nyog hardness gradient (piv txwv li, hloov sai sai)?
Lub hardness gradient sai sai txhais tau tias tsis muaj kev hloov pauv ntawm cov tawv tawv thiab cov matrix mos, ua rau muaj kev ntxhov siab loj heev ntawm qhov sib cuam tshuam hauv qab load. Tsheb ciav hlau vibrations sai pib tawg ntawm no, uas propagate thiab ua rau nto spalling. Tsis zoo li ib txwm hnav, qhov no yog cov chunks poob sai sai, cuam tshuam lub log ncaj qha - kev sib cuag. Tsis tas li ntawd, kev nyuaj siab sai sai ua rau txoj kev tsheb ciav hlau nkig, ua rau muaj kev pheej hmoo ntawm kev puas tsuaj nyob rau hauv qis - qhov kub thiab txias.
Suav thiab thoob ntiaj teb cov qauv sib txawv li cas hauv cov txheej txheem hardness gradient rau qhov kawg -quenching?
Suav cov qauv qhia qhov tseem ceeb rau kev sib xyaw ua ke rau cov neeg caij tsheb sib xyaw- cov kab thauj khoom, qhia txog thaj chaw hloov pauv dav dua kom ntseeg tau tias muaj zog. Cov txheej txheem thoob ntiaj teb xws li UIC 860 tsim cov kev cai nruj dua rau kev siab - cov tsheb ciav hlau ceev, ua kom muaj qhov tseeb dua thiab smoother hardness decay nkhaus nrog txoj kev nqaim. Cov qauv txawv teb chaws kuj txhais tau tias thaj chaw quenched ntev dua, npog tag nrho qhov siab -frequency contact band, xav txog cov kev xav tau siab dua rau kev tswj kev cuam tshuam hauv kev ua haujlwm siab -.
Yuav txiav txim kawg li cas -quenching zoo ntawm -site ntawm rail nto tej yam kev mob?
Tsim nyog quenched taub hau tsim ib lub teeb, zoo ci kev sib cuag band pib yam tsis muaj yas deformation. Kev nyuaj siab hauv zos los yog "ridging" qhia tias tsis txaus hardness lossis tsis sib xws gradients. Cov ntug me me tej zaum yuav tshwm sim los ntawm cov tawv tawv ntau dhau thiab tsis muaj zog vim tsis muaj kev hloov pauv. Tsis tas li ntawd, kev soj ntsuam cov ntses- nplai tawg ceev, siab - zoo quenching ho qeeb pib tawg thiab slows propagation.
Yuav ua li cas ceev faj tshwj xeeb thaum vuam kawg -quenched rails?
Kev tswj qhov kub ntawm preheating yog qhov tseem ceeb, vim tias quenched microstructures yog qhov kub thiab txias -sensitive; tsis txaus preheating ua rau vuam tawg. Tom qab- vuam tempering ntawm qhov sib koom ua ke thiab cov cheeb tsam uas nyob ib sab quenched yog yuav tsum tau los txo cov kev ntxhov siab uas seem thiab tiv thaiv kev puas tsuaj. Kev sib tsoo yuav tsum khaws cov quenched txheej thickness kom tsis txhob nthuav tawm cov matrix muag. Weld spatter kuj tseem yuav tsum tau tiv thaiv los ntawm kev sib cuag ntawm qhov chaw quenched kom tsis txhob muaj kev puas tsuaj rau cov thermal puas thiab qhov chaw hardness poob.