Kev cuam tshuam ntawm cheeb tsam yas ntawm qaug zog tawg propagation cwj pwm ntawm hnav-resistant phaj alloys
Hnav-resistant phaj alloy tam sim no lees paub tias yog ib qho ntawm cov khoom siv zoo tshaj plaws hnav cov ntaub ntawv tiv thaiv, tau siv dav. Hnav-resistant phaj alloy muaj zoo heev hnav tsis kam, toughness thiab processability. Kev tshawb fawb txog kev hnav-tiv taus daim hlau nyob rau hauv 30 xyoo dhau los kuj qhia tau hais tias domestic hnav-resistant phaj alloys kuj muaj cov khoom zoo heev.
Kev hnav tsis kam thiab qaug zog ntawm hnav-resistant phaj alloys tau kawm hauv qee lub tebchaws, tab sis cov txiaj ntsig tsis sib xws. Tam sim no, muaj ob peb cov ntaub ntawv qhia txog kev hnav tsis kam thiab qaug zog ntawm hnav-resistant phaj alloys hauv Suav teb.
Kev cuam tshuam ntawm unidirectional yas cheeb tsam loj ntawm qaug zog tawg propagation cwj pwm ntawm domestic hnav-resistant phaj alloy tau kawm nyob rau hauv saturated oxygen kub thiab siab purity dej nrog tawg tip nyob rau hauv ib tug me me yield ntau yam, nyob rau hauv ua ke nrog nrog txawv teb chaws tshawb fawb tau thiab nyob rau hauv ib feem nrog siv. rau ASTME647. Lub ntsiab chemical muaj pes tsawg leeg (feem ntau, %) ntawm domestic coj-resistant phaj alloy muab los ntawm ib lub tuam txhab yog: Ni60.03, Cr30.38, Fe9.42, Cu0.13, Nb0.01, Mo0.07. Tom qab lub tshuab nqus tsev melting thiab electroslag remelting refining, cov hlau tau txais Φ150mm ingot, kub dov rau hauv Φ25mm bar. Tom qab kev daws teeb meem ntawm 1050 degree thiab desensitization ntawm 750 degree rau 15h, cov tuav tau ua tiav rau hauv cov qauv compact tensile (CT) nrog qhov dav ntawm 16mm. Tom qab desensitization, lub zog tawm ntawm cov khoom yog 270MPa ntawm chav tsev kub thiab 220MPa ntawm 325 degree.
Cov nyhuv ntawm rp ntawm kev qaug zog tawg kev loj hlob tus cwj pwm ntawm hnav-resistant phaj alloy tau kawm los ntawm kev ua rau qaug zog tawg kev loj hlob kev ntsuam xyuas nyob rau hauv cov huab cua ntawm chav tsev kub thiab saturated oxygen siab purity dej ntawm 325 degree. Cov txiaj ntsig qhia tau tias:
(1) Nyob rau tib zaus, qhov tawg ntawm kev loj hlob ntawm CGR nce nrog qhov nce ntawm rp, tab sis qhov cuam tshuam ib puag ncig Fen tsis hloov pauv loj.
(2) Cov kab nrib pleb ntawm cov khoom siv hluav taws xob-resistant phaj alloy yog transgranular nthuav dav, nrog rau cov ceg me me thaum lub sij hawm nthuav dav, thiab kev hloov ntawm cov khoom tsis muaj qhov pom tseeb ntawm cov ceg tawg.
(3) Nyob rau hauv saturated oxygen siab kub thiab siab purity dej, qhov tawg ntawm domestic hnav-resistant phaj alloy yog ib tug raug hnav-resistant fatigue yam ntxwv, thiab tawg propagation tsim ib cheeb tsam ridge nrog ductile puas yam ntxwv thiab ib tug qaug zog platform nrog brittle qaug zog tawg. .
