1, tshuaj ntsuam xyuas qhov tseeb
Cov tshuaj lom neeg muaj pes tsawg leeg yuav txiav txim siab rau qhov kev ua tau zoo ntawm cov hlau, tab sis cov muaj pes tsawg leeg tsim nyog thiab tsis muaj peev xwm to taub qhov kev ua tau zoo ntawm cov hlau. Vim lub non-uniformity ntawm lub koom haum nrog thiab muaj pes tsawg leeg ntawm cov hlau, lub tshuaj ntsuam tshuaj pab no deficiency mus rau ib tug loj li.
Macroscopic soj ntsuam tau soj ntsuam cov crystallization ntawm cov hlau, qhov ua tiav ntawm cov hlau thiab qhov tsis-uniformity ntawm qee feem.
Txheem "Tus Qauv Uas Tsawg Feem Pua Lag Luam Cov Qeb Tshuaj Qiv" GB1979
Muaj 8 yam ntawm cov teeb meem ntawm kev lag luam: sib cais, loosening, inclusions, shrinkage qhov, npuas, dawb me ntsis, cov kab nrib pleb, thiab quav.
Pwm daim duab
Pwm daim duab
2.1, kev txheeb xyuas ntawm lub koom haum tsis ntseeg
Lub hom phiaj ntawm kev ntuav yog txo qhov nyuaj ntawm cov hlau, pab txhawb kev ua haujlwm, thiab npaj tau rau kev kho kub tom qab.
Cov cuab yeej carbon steel annealing lub koom haum raws li GB1298 kev ntsuam xyuas kev ntaus nqi ntawm qhov kev ntsuam xyuas thawj.
2.2, carbide inhomogeneity
Cr12-type benessllite steel muaj ib qho loj npaum eutectic carbides hauv tus qauv. Cov non-uniformity ntawm carbides muaj feem xyuam tseem ceeb ntawm kev pabcuam kev ua haujlwm, yog li kev faib khoom ntawm carbides yuav tsum yog tswj xyuas nruj me ntsis.