Kev sim kawm txog cov txiaj ntsig ntawm boron ntawm hydrogen embrittlement tawg ntawm cov pa roj carbon tsawg-cov tawv-resistant daim hlau
Martensitic low-carbon nyias hnav-tiv taus daim hlau yog siv los tsim cov khoom siv tsheb uas yuav tsum muaj lub zog ultra-siab thiab muaj peev xwm tiv taus kev cuam tshuam thiab kev sib tw. Cov phaj hnav-resistant no feem ntau yog siv los ua cov khoom zoo li los ntawm yob txoj kev. Tsis ntev los no steel qhov chaw nrog martensitic microstructures thiab ntau cov duab nyuaj tau ua tiav los ntawm kub stamping thiab ces nias quenching ntawm austenite stabilizing kub.
Kev tshawb fawb txog kev cuam tshuam ntawm tempering ntawm tensile specimens ntawm AISI10B22, 0.22wt%C, 22MnB5 boron alloy nyias hnav-resistant daim hlau pom tias tom qab 6% -8% ntawm cov qauv tau tempered rau martensite ntawm 150-350oC, lub zog yog 1200MPa Muaj yuav luag tsis muaj kev hloov pauv ntawm cov ductility ntawm cov phaj hnav-resistant ntawm 1600MPa thiab 1600MPa. Tom qab nce qhov kub thiab txias, qhov loj ntawm qhov tsis sib xws tshwm sim tshwm sim, strain hardening yog txo, thiab lub zog txo. Hnav-tiv taus daim hlau nrog cov ntsiab lus carbon ntawm 0.4wt%, quenched, thiab tempered rau super-zog steel, tshwj xeeb tshaj yog nruab nrab-carbon steel, yog rhiab heev rau hydrogen embrittlement. Thaum plating high-strength fasteners nrog chromium los yog cadmium, hydrogen yog qhia los ntawm electroplating, thiab rhiab heev rau hydrogen embrittlement yuav tsum tau txo los ntawm tsawg-kub ci ntawm ib ncig ntawm 150oC. Cov yam ntxwv tseem ceeb ntawm hydrogen embrittlement ntawm nruab nrab carbon steel yog intergranular fractures ntawm thawj austenite grain ciam teb, thiab nag lossis daus ntawm phosphorus, antimony, tin, thiab arsenic atoms.
Lub hydrogen embrittlement ntawm hlau thiab tsawg carbon hnav-resistant daim hlau manifests nws tus kheej li transgranular puas thiab intergranular puas. Cov pob txha tawg tawg tshwm sim ntawm lub dav hlau plam es tsis txhob ntawm {100} cleavage dav hlau ntawm lub cev-centered cubic qauv, uas yog raws li lub dav hlau plam debonding mechanism. Cov hlau me me feem ntau welded thiab raug kev puas tsuaj los ntawm hydrogen embrittlement.
