Engineering Metallurgy yog dab tsi thiab nws cov piv txwv
Introduction
Kev tsim kho hlau yog ib qho chaw tshwj xeeb hauv kev tshawb fawb txog cov khoom siv thiab kev tsim kho uas tsom mus rau kev kawm txog cov hlau cov yam ntxwv, tus cwj pwm, thiab cov txheej txheem ua. Nws suav nrog kev tshuaj xyuas seb cov hlau cuam tshuam li cas nrog lwm cov ntaub ntawv, lawv teb li cas rau ntau qhov chaw sib txawv, thiab lawv tuaj yeem siv li cas los ua kom zoo dua lawv cov khoom siv kho tshuab, thermal, thiab tshuaj lom neeg. Lub teb no muaj cov ntsiab cai tseem ceeb thiab cov ntawv thov ua haujlwm, ua rau nws tseem ceeb rau ntau yam lag luam, suav nrog tsheb, aerospace, kev tsim kho, thiab hluav taws xob.
Keeb kwm thiab Evolution
Kev ua hlau metallurgy muaj keeb kwm thaum ub, txij li thaum ub los txog rau cov neeg Iyiv thiab Mesopotamians uas tau paub txog kev ua hlau. Kev tshwm sim ntawm Kev Hloov Pauv Kev Lag Luam tau tshaj tawm txog kev dhia loj hauv kev ua hlau, hloov nws los ntawm kev ua tes ua taw mus rau hauv kev qhuab qhia kev tshawb fawb nruj. Lub xyoo pua 20th pom kev koom ua ke ntawm cov txheej txheem thiab cov thev naus laus zis zoo dua, xws li X-ray diffraction thiab electron microscopy, uas tso cai rau cov kws tshawb fawb metallurgists tshawb nrhiav cov hlau ntawm qib atomic thiab molecular.
Cov Ntsiab Lus Tseem Ceeb hauv Kev Tsim Kho Metallurgy
Hlau Khoom
Kev nkag siab txog cov hlau pib nrog kev nkag siab txog lawv cov yam ntxwv tseem ceeb. Feem ntau cov hlau muaj cov yam ntxwv zoo li no:
1. Cov Khoom Siv Kho Tshuab: Cov no suav nrog lub zog tensile, ductility, hardness, thiab toughness. Txhua yam khoom ua lub luag haujlwm tseem ceeb hauv kev txiav txim siab qhov tsim nyog ntawm cov hlau rau cov kev siv tshwj xeeb.
2. Cov Khoom Siv Thermal: Cov no suav nrog qhov chaw yaj, kev ua kom sov, thiab kev nthuav dav thermal. Kev paub txog cov khoom no yog qhov tseem ceeb rau cov ntawv thov uas muaj qhov kub thiab txias heev.
3. Cov Khoom Siv Tshuaj Lom Zem: Cov no tswj tau qhov ua xua nrog lwm yam tshuaj, tiv taus xeb, thiab oxidation. Cov khoom siv tshuaj lom neeg yog qhov tseem ceeb heev rau hauv cov chaw uas raug cov tshuaj lom neeg hnyav lossis cov huab cua.
Kev siv Crystallography
Cov qauv siv lead ua ntawm cov hlau muaj feem cuam tshuam rau nws cov yam ntxwv. Feem ntau cov hlau muaj cov qauv siv lead ua, nrog rau cov atoms teeb tsa ua cov qauv sib dhos. Kev nkag siab txog cov qauv no pab cov kws tshawb fawb txog hlau siv cov hlau kom ua tiav cov yam ntxwv xav tau, xws li muaj zog dua lossis ua kom yooj ywm dua.
Cov Duab Qhia Txog Theem
Cov duab kos theem yog cov duab kos uas qhia txog kev ruaj khov ntawm ntau theem ntawm cov hlau nyob rau hauv ntau yam kub thiab siab. Cov duab kos no yog qhov tseem ceeb hauv metallurgy rau kev tsim cov txheej txheem kho cua sov uas hloov kho cov khoom hlau kom haum rau cov kev xav tau tshwj xeeb ntawm engineering.
Cov txheej txheem metallurgical
Kev rho tawm thiab kev ua kom zoo
Theem pib ntawm kev tsim kho metallurgy yog rho cov hlau tawm ntawm cov ores. Cov txheej txheem xws li pyrometallurgy (siv qhov kub siab) thiab hydrometallurgy (siv aqueous chemistry) feem ntau yog siv. Cov hlau uas tau rho tawm feem ntau yuav tsum tau ua kom huv si kom tshem tawm cov khoom tsis huv thiab ua tiav cov qib huv uas xav tau.
Alloying
Kev sib xyaw ua ke yog cov txheej txheem ntawm kev sib xyaw ua ke cov hlau nrog ib lossis ntau yam khoom los txhim kho nws cov yam ntxwv. Piv txwv li, kev ntxiv cov pa roj carbon rau hlau ua rau hlau, ua rau nws lub zog thiab kev ruaj khov zoo dua li hlau ntshiab.
Kev Kho Cua Sov
Kev kho cua sov suav nrog ntau yam txheej txheem uas hloov pauv cov hlau lub microstructure kom txhim kho nws cov khoom siv kho tshuab. Cov txheej txheem kho cua sov feem ntau suav nrog:
1. Kev Ua Kub: Ua kom ib lub hlau sov rau qhov kub tshwj xeeb thiab tom qab ntawd maj mam txias kom nws mos thiab ua rau nws yooj ywm dua.
2. Kev Tua Kub: Ua kom cov hlau txias sai sai tom qab ua kom sov mus rau qhov kub siab kom ua rau nws tawv dua. Feem ntau, cov hlau raug tua kub hauv dej, roj, lossis huab cua.
3. Kev Kho Kom Kub: Rov ua kom cov hlau uas twb tau kho kom sov mus txog qhov kub qis dua qhov kub tseem ceeb thiab tom qab ntawd ua kom txias. Cov txheej txheem no ua rau cov hlau tawv dua thaum tseem khaws qee qhov tawv.
4. Kev Kho Kom Ruaj: Ib pawg kev kho cua sov uas tsuas yog ua kom txheej hlau ntawm lub cev tawv thaum tseem ua kom lub plawv sab hauv mos dua thiab yoog tau yooj yim dua. Cov txheej txheem suav nrog carburizing, nitriding, thiab carbonitriding.
Tsim thiab Shaping
Kev tsim kho hlau kuj muaj ntau txoj kev siv los ua cov hlau kom zoo nkauj rau cov khoom kawg. Cov no suav nrog kev casting, forging, dov, thiab extrusion, txhua yam muaj txiaj ntsig sib txawv thiab haum rau cov ntawv thov tshwj xeeb. Piv txwv li, forging ua rau cov khoom tawv dua, thaum casting tso cai rau cov duab nyuaj.
Daim ntawv thov thiab piv txwv
Automotive kev lag luam
Hauv kev lag luam tsheb, kev tsim kho hlau yog qhov tseem ceeb rau kev tsim cov khoom uas sib dua thiab muaj zog. Cov hlau txhuas siv dav dav los txo qhov hnyav ntawm lub tsheb thiab txhim kho kev siv roj. Cov hlau muaj zog siab heev (AHSS) siv rau hauv cov khoom siv los txhim kho kev nyab xeeb ntawm kev sib tsoo. Kev nce qib ntawm hlau kuj tseem ua lub luag haujlwm hauv kev tsim cov roj teeb hluav taws xob hauv tsheb, qhov twg cov hlau zoo li lithium thiab nickel yog qhov tseem ceeb.
Aerospace Kev Lag Luam
Kev lag luam aerospace xav tau cov ntaub ntawv uas tuaj yeem tiv taus cov xwm txheej hnyav thaum tseem tsis hnyav. Titanium alloys thiab superalloys xws li Inconel yog siv rau hauv cav thiab airframes vim lawv qhov sib piv zoo heev ntawm lub zog-rau-qhov hnyav thiab tiv taus qhov kub siab.
siv cov kev faib
Kev ua hlau yog qhov tseem ceeb rau kev tsim kho, cuam tshuam txhua yam los ntawm kev xaiv cov hlau hauv cov tsev thiab cov choj mus rau kev tsim cov hlau uas tiv taus xeb. Lub tsev siab niaj hnub thiab cov chaw tsim kho loj ua rau lawv muaj zog thiab ruaj khov rau kev nce qib hauv kev tsim kho hlau.
electronics
Hauv kev lag luam hluav taws xob, cov hlau xws li tooj liab, kub, thiab txhuas yog qhov tseem ceeb rau lawv cov khoom siv hluav taws xob. Cov txheej txheem hlau ua kom cov hlau no huv si thiab cov khoom me me, ua kom muaj kev ua tau zoo thiab kev ntseeg siab ntawm cov khoom siv hluav taws xob.
Biomedical Applications
Hauv kev tsim kho mob biomedical, cov hlau uas sib haum nrog lub cev xws li titanium thiab stainless hlau yog siv rau kev cog hniav thiab prosthetics. Cov txheej txheem metallurgical siab heev ua kom cov khoom no tsis xeb hauv tib neeg lub cev thiab phim cov khoom siv kho tshuab ntawm cov pob txha ntuj.
Cov kev sib tw thiab cov kev taw qhia yav tom ntej
Kev tsim kho hlau metallurgy ntsib teeb meem uas tseem niaj hnub muaj, suav nrog qhov xav tau kev coj ua kom ruaj khov hauv kev rho tawm thiab ua cov hlau. Kev txhawj xeeb txog ib puag ncig yog tsav kev tshawb fawb txog kev siv cov hlau rov ua dua tshiab thiab tsim cov txheej txheem rho tawm ntsuab dua. Tsis tas li ntawd, thaj chaw no tab tom tshawb nrhiav cov ntaub ntawv siab heev xws li cov hlau ntse thiab cov hlau nanostructured, uas cog lus tias yuav coj cov ntawv thov tshiab thiab txhim kho cov thev naus laus zis uas twb muaj lawm.
xaus
Kev ua hlau metallurgy tseem yog lub hauv paus tseem ceeb ntawm kev lag luam niaj hnub no, sib txuas kev tshawb fawb thiab kev tsim kho kom nkag siab thiab txhim kho cov khoom thiab kev siv hlau. Nws cov ntsiab cai thiab cov txheej txheem yog qhov tseem ceeb rau ntau lub koom haum, tsav tsheb tsim kho tshiab thiab pab txhawb rau kev nce qib hauv thev naus laus zis. Raws li thaj chaw hloov pauv, nws txuas ntxiv daws cov teeb meem niaj hnub no, xyuas kom meej tias nws muaj feem cuam tshuam thiab cuam tshuam hauv lub ntiaj teb uas vam khom hlau ntau zuj zus.
