Cilladaha iyo ka-hortagga been-abuurka waaweyn: dildilaaca been-abuurka

In weynbeen abuurasho, Marka tayada alaabta ceeriin ay liidato ama habka foorjarigu aanu ahayn waqtigii saxda ahaa, dildilaaca been abuurka ah ayaa badanaa si fudud u dhaca.
Kuwa soo socdaa waxay soo bandhigayaan dhowr xaaladood oo dildilaac been abuur ah oo ay sababeen walxo liita.
(1)Been abuurashodildilaaca ay sababaan cilladaha

https://www.shdhforging.com/news/defects-and-countermeasures-of-large-forgings-forging-cracks

Inta badan cilladaha la jeexjeexay waxay sababi karaan dildilaac marka la been abuurayo, sida ku cad Sawirka, kaas oo ah dildilaaca dhexe ee 2Cr13 Spindle been-abuurka.
Tani waa sababta oo ah kala duwanaanta heerkulka crystallization waa cidhiidhi iyo isku-dheellitirnaanta yaraanshaha toosan waa weyn tahay marka 6T ingot uu adkeeyo.
Sababo la xiriira uumiga iyo yaraanta ku filnayn, heerkulka weyn ee u dhexeeya gudaha iyo dibadda, stress axial weyn, dendrite dillaacay, samaynta dildilaaca inter-axial ingot ah, kaas oo la sii ballaariyay inta lagu guda jiro foornada si ay u noqdaan dildilaac ah oo ka been abuurtay dunidu.

Ciladda waxa lagu tirtiri karaa:
(1) Si loo hagaajiyo nadiifinta dhalada birta dhalaalaysa;
(2) Qaboojin si tartiib ah, hoos u dhigista diiqada kulaylka;
(3) Adeegso wakiilka kulayliyaha wanaagsan iyo koofiyadda dahaadhka, kordhinta awoodda buuxinta dhimista;
(4)Isticmaal habka been abuurka is jiid jiidka xarunta.

(2)Been abuurashodildilaaca ay sababto roobka wasakhda waxyeelada leh ee birta ku teedsan xuduudaha badarka.

Baaruudda birta ku jirta ayaa inta badan lagu soo degdegaa soohdinta hadhuudhka ee qaabka FeS, kaas oo barta dhalaalkeedu yahay 982℃ oo keliya. Heerkulka foornada ee 1200 ℃, FES ee xuduudka hadhuudhka ayaa dhalaali doona oo ku hareerayn doona miraha qaab filim dareere ah, kaas oo burburin doona xidhiidhka ka dhexeeya badarka oo soo saari doona jilicsanaanta kulaylka, iyo dildilaaca ayaa dhici doona ka dib wax yar oo been abuur ah.

Marka naxaasta ku jirta birta lagu kululeeyo jawiga peroxidation at 1100 ~ 1200 ℃, sababtoo ah oksaydhaynta xulashada, meelaha naxaasta leh ayaa ka samaysan doona lakabka dusha sare. Marka milanka naxaasta ee austenite uu dhaafo kan naxaasta, naxaasta waxaa loo qaybiyaa qaab filim dareere ah oo ku yaal xadka hadhuudhka, samaynta jajabnaanta naxaasta oo aan awoodin in la been abuurto.
Haddii ay jiraan daasad iyo antimony ee birta, milanka naxaasta ee austenite si dhab ah ayaa loo dhimi doonaa, iyo u janjeeranimada ayaa la xoojin doonaa.
Sababtoo ah maadada sare ee naxaasta, dusha sare ee foornada birta ayaa si xushmad leh loo xushay inta lagu jiro kuleylinta foornada, si ay naxaasta u hodmaan xuduudka hadhuudhka, iyo dildilaaca been abuurka waxaa la sameeyay by nukleating iyo ballaarinta weheliso wejiga qani ku ah naxaasta ee xadka hadhuudhka.

(3)dildilaac been abuur ahwaxaa keenay wejiga kala duwan (wejiga labaad)

Qalabka farsamada ee wejiga labaad ee birta ayaa inta badan aad uga duwan kan matrixka birta, sidaas darteed culeyska dheeraadka ah wuxuu keeni doonaa balaastigga habka guud inuu hoos u dhaco marka qallafsanaanta qulqulo. Marka cadaadiska maxalliga ahi uu dhaafo xoogga isku xidhka ee u dhexeeya marxaladda kala duwan iyo matrixka, kala-soocidda ayaa dhici doonta oo godadka ayaa la samayn doonaa.
Tusaale ahaan, oxides, nitrides, carbides, borides, sulfides, silicates iyo wixii la mid ah ee birta ah.
Aynu nidhaahno wejiyadani waa cufan.
Qaybinta silsiladda, gaar ahaan dhinaca soohdinta hadhuudhka halkaas oo xoogga isku xidha ee daciifka ah uu jiro, heerkulka sare ee abuuritaanka ayaa dillaaci doona.
Qaab-dhismeedka macroscopic ee dildilaaca been abuurka ah ee ay sababtay roobabka AlN ee ku teedsan xadka hadhuudhka ee 20SiMn steel 87t ingots ayaa oksaydhsaydhmay oo loo soo bandhigay sidii kiristaalo polyhedral columnar.
Falanqaynta yar yar waxay muujinaysaa in dildilaaca been-abuurka ahi uu la xidhiidho qadarka badan ee hadhuudhka wanaagsan ee AlN ee ku teedsan soohdinta miraha aasaasiga ah.

Tallaabooyinka liddiga ku ahka hortag dildilaacaOo ay sababto roobka nitride aluminium ee la socda crystal waa sida soo socota:
1. Xaddid cadadka aluminiumka lagu daro birta, ka saar nitrogen birta ama ka celi roobabka AlN adoo ku daraya titanium;
2. Qabo dhalmada kulul iyo habka aadka loo qaboojiyey ee habka daaweynta isbeddelka;
3. Kordhi heerkulka quudinta kulaylka (> 900 ℃) oo si toos ah kulaylka foornada;
4. Kahor inta aan la been abuurin, isku-duubni ku filan ayaa la sameeyaa si loo sameeyo faafinta wejiga roobabka soohdinta hadhuudhka.


Waqtiga boostada: Dec-03-2020

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