Tsawg-carbon bainitic steel tau dav siv nyob rau hauv ntau yam kev lag luam tseem ceeb ntawm lub teb chaws kev lag luam vim nws cov khoom siv zoo tshaj plaws thiab cov khoom siv vuam, thiab cov nqi tsim khoom tsawg. Txawm li cas los xij, vim qhov kev txhim kho lig ntawm cov hlau no, cov teeb meem ntawm steel toughening thiab microstructure tswj tsis tau zoo, uas tau ua rau muaj qee yam teeb meem hauv kev txhim kho thiab siv cov hlau no.
1. Cov ntaub ntawv xeem thiab cov txheej txheem
Cov khoom siv ntsuas yog forged low-carbon bainitic steel nrog lub zog tawm ntawm 785MPa. Cov hlau yog normalized, quenched thiab tempered. Los ntawm kev kho qhov kub thiab txias, qhov ntsuas kub yog tempered ntawm qhov kub thiab txias: 570 degree, 600 degree, 630 degree, 660 degree. Kev ntsuas kub-kho cov hlau tau ua tiav rau hauv cov qauv, thiab cov khoom siv kho tshuab thiab cov qauv metallographic ntawm cov qauv raug sim los kawm txog kev cuam tshuam ntawm qhov sib txawv ntawm qhov kub thiab txias ntawm microstructure thiab cov khoom ntawm cov hlau kuaj.
Thaum lub tempering kub ntawm 570 thiab 630 degree, lub zog tawm los thiab tensile zog yog nyob nruab nrab ntawm 995 thiab 716 MPa thiab 1077 thiab 804 MPa. Thaum qhov kub nce mus txog 660 degree, lub zog tawm los thiab lub zog tensile txo qis heev. Nrog rau qhov nce ntxiv ntawm tempering kub, qhov tawm los lub zog thiab tensile lub zog ntawm kev sim steel maj mam txo. Lub elongation tsis pom tseeb cuam tshuam los ntawm qhov kub thiab txias, tab sis nws tuaj yeem pom los ntawm cov duab uas elongation maj mam nce nrog qhov nce ntawm tempering kub. Qhov cuam tshuam toughness qhia tau hais tias muaj kev nce siab nrog qhov nce ntawm tempering kub.
Mild Steel Yeeb Nkab
