Me yasa kusoshi suna da ƙarfin gajiya

Germination na gajiya crack na aronji:

Wuri na farko da gajiyawar ta fara farawa ana kiranta tushen gajiya sosai, kuma tushen gajiya yana da matukar kula da microstructure kuma yana iya fara faɗuwar gajiya a ƙaramin ma'auni. Gabaɗaya magana, a tsakanin nau'ikan hatsi uku zuwa biyar, matsalar ingancin yanayin ƙyalli ita ce babbar tushen gajiya kuma yawancin gajiya yana farawa ne daga ƙasa ko ƙasa.

Duk da haka, akwai babban adadin dislocations da wasu alloying abubuwa ko ƙazanta a cikin crystal na aron kusa abu, da kuma hatsi iyaka ƙarfi ne sosai daban-daban, kuma wadannan dalilai na iya haifar da gajiya crack fara. Sakamakon ya nuna cewa fashewar gajiya yana da saurin faruwa a iyakokin hatsi, haɗaɗɗun saman ƙasa ko ɓangarori na biyu da ɓoyayyiya, waɗanda duk suna da alaƙa da rikitarwa da canjin kayan. Idan microstructure na kusoshi za a iya inganta bayan zafi jiyya, ta gajiya ƙarfi iya ƙara zuwa wani matsayi.

Illar decarbonization akan gajiya:

Decarburization na angwaye surface iya rage surface taurin da kuma sa juriya na aron kusa bayan quenching, kuma zai iya yadda ya kamata rage gajiya ƙarfi na aronji. GB/T3098.1 misali don aikin bolt na gwajin decarbonization. Yawancin takardu sun nuna cewa rashin kulawar zafi mara kyau na iya rage ƙarfin gajiyar kusoshi ta hanyar decarburizing farfajiyar da kuma rage ingancin yanayin. Lokacin da ake nazarin dalilin gazawar ƙarfin karaya mai ƙarfi, an gano cewa Layer decarbonization yana wanzuwa a mahaɗin sandar kai. Duk da haka, Fe3C na iya amsawa tare da O2, H2O da H2 a babban zafin jiki, wanda ya haifar da raguwar Fe3C a cikin abin da ke cikin ƙullun, don haka yana ƙara yawan lokaci mai mahimmanci na kayan ƙwanƙwasa da kuma rage ƙarfin abin rufewa.