Multilateralized Cracks
Patsogolo lolimba la crystallization, pansi pa kutentha kwakukulu ndi kupsinjika maganizo, zowonongeka za lattice zimasuntha ndikuphatikizana kuti zikhale malire achiwiri, omwe ali mu pulasitiki yotsika kutentha kwambiri, ndipo ming'alu imapangidwa pansi pa kupsinjika maganizo.Multilateral ming'alu zimachitika mu welds wa zitsulo koyera kapena limodzi gawo austenitic aloyi kapena pafupi ndi msoko, ndipo iwo ndi a mtundu wa ming'alu otentha.
Bweretsani Ming'alu
Pakuti zitsulo ndi wandiweyani mbale welded kapangidwe ndi zina mpweya-kulimbikitsa alloying zinthu, ming'alu zomwe zimachitika m'madera coarse-grained wa kuwotcherera kutentha anakhudzidwa zone pa nkhawa chithandizo kutentha kapena ntchito pa kutentha kwina amatchedwa reheat ming'alu.Kuwotchera ming'alu nthawi zambiri kumachitika m'madera ozungulira omwe amakhudzidwa ndi kutentha kwazitsulo zotsika kwambiri, zitsulo za pearlitic zosagwira kutentha, zitsulo zosapanga dzimbiri za austenitic ndi ma alloys opangidwa ndi nickel.
Mazira Ozizira
Kuzizira kozizira ndi mtundu wofala kwambiri wa ming'alu yomwe imapangidwa powotcherera, yomwe imapangidwa pamene kutentha kwazizira mpaka kutentha kochepa pambuyo pa kuwotcherera.Cold ming'alu makamaka zimachitika kuwotcherera kutentha anakhudzidwa zone wa low aloyi zitsulo, sing'anga aloyi zitsulo, sing'anga mpweya ndi mkulu mpweya zitsulo.Nthawi zina, monga kuwotcherera zitsulo zolimba kwambiri kapena ma aloyi ena a titaniyamu, ming'alu yozizira imawonekeranso pazitsulo zowotcherera.
Malinga ndi mitundu yosiyanasiyana yazitsulo ndi zida zomwe ziyenera kuwotcherera, palinso mitundu yosiyanasiyana ya ming'alu yozizira, yomwe imatha kugawidwa m'magulu atatu awa:
Kuchedwa Crack
Ndi mtundu wamba wa ming'alu yozizira.Mbali yake yaikulu ndi yakuti sichimawonekera mwamsanga pambuyo pa kuwotcherera, koma imakhala ndi nthawi yowonongeka kwambiri, ndipo imakhala ndi mng'alu ndi makhalidwe ochedwa omwe amapangidwa pansi pa machitidwe ophatikizana a dongosolo lolimba, hydrogen ndi kudziletsa kupsinjika.
Kuzimitsa Ming'alu
Mtundu woterewu wa mng'alu suchedwa kuchedwa, umapezeka pambuyo pa kuwotcherera, nthawi zina umapezeka mu weld, nthawi zina umapezeka kumalo okhudzidwa ndi kutentha.Makamaka pali owuma dongosolo, ming'alu kwaiye pansi zochita kuwotcherera nkhawa.
Low Plastic Embrittlement Crack
Kwa zida zina zokhala ndi pulasitiki yotsika, zikamazizira mpaka kutentha pang'ono, kupsinjika komwe kumachitika chifukwa cha shrinkage mphamvu kumapitilira nkhokwe ya pulasitiki ya zinthuzo kapena ming'alu yomwe imayamba chifukwa cha zinthuzo.Chifukwa chakuti amapangidwa pa kutentha kochepa, ndi mtundu wina wa mng'alu wozizira, koma palibe chodabwitsa chochedwa.
Kuphulika kwa Laminar
Popanga nsanja zazikulu zopangira mafuta ndi zombo zopindika zokhala ndi mipanda, nthawi zina zimachitika ming'alu yofanana ndi njira yozungulira, yomwe imatchedwa kung'ambika kwa laminar.
Makamaka chifukwa cha kukhalapo kwa wosanjikiza inclusions (pambali kugubuduza malangizo) mkati mwa mbale zitsulo, kupsyinjika kwaiye pa kuwotcherera ndi perpendicular kwa anagubuduza malangizo, chifukwa mu "anaponda" wosanjikiza mawonekedwe mu zone kutentha bwanji kutali ndi moto. chong'ambika.
Stress Corrosion Cracking
Kuchedwa kusweka kwa zinthu zina zowotcherera (monga zotengera ndi mapaipi) mothandizidwa ndi zida zowononga komanso kupsinjika.Zomwe zimakhudzidwa ndi kuwonongeka kwa corrosion ndi zinthu zomwe zimapangidwira, mtundu wa zowonongeka, mawonekedwe ake, kupanga ndi kuwotcherera, zinthu zowotcherera, komanso kuchuluka kwa kupsinjika maganizo.Kupsinjika kwamphamvu kumachitika panthawi yantchito.
Nthawi yotumiza: Apr-24-2022