Ukuntshula kokudinwa kukuqhekeka kwebholiti:
Indawo yokuqala apho i-crack yokudinwa iqala ngokufanelekileyo ibizwa ngokuba ngumthombo wokudinwa, kwaye umthombo wokudinwa unomdla kakhulu kwi-bolt microstructure kwaye unokuqalisa ukudinwa kweentanda kwizinga elincinci kakhulu. Ngokubanzi, phakathi kobukhulu obuziinkozo ezintathu ukuya kwezintlanu, ingxaki yomgangatho webholithi ngowona mthombo wokudinwa kwaye uninzi lokudinwa luqala kumphezulu webholiti okanye kumphezulu ongaphantsi.
Nangona kunjalo, kukho inani elikhulu lokuchithwa kunye nezinye izinto ezidibeneyo okanye ukungcola kwi-crystal ye-bolt material, kwaye amandla omda wengqolowa ahluke kakhulu, kwaye ezi zinto zingakhokelela ekuqalisweni kokukhathala kokuqhekeka. Iziphumo zibonisa ukuba ukukhathala ukuqhekeka kuyenzeka ukuba kwenzeke kwimida yengqolowa, ukufakwa kwendawo okanye iinqununu zesigaba sesibini kunye ne-voids, zonke zihambelana nobunzima kunye nokuguqulwa kwezinto. Ukuba i-microstructure ye-bolts inokuphuculwa emva kokunyangwa kobushushu, amandla ayo okukhathala anokunyuswa kwinqanaba elithile.
Iziphumo ze-decarbonization ekudinweni:
I-decarburization ye-bolt surface inokunciphisa ubulukhuni bomphezulu kunye nokumelana nokunxiba kwe-bolt emva kokucima, kwaye kunokunciphisa ngokufanelekileyo amandla okudinwa kwebholiti. Umgangatho we-GB/T3098.1 wokusebenza kwebholiti yovavanyo lwe-decarbonization. Inani elikhulu lamaxwebhu abonisa ukuba unyango olungafanelekanga lobushushu lunokunciphisa amandla okudinwa kweebholiti ngokususa i-carburizing umphezulu kunye nokunciphisa umgangatho womphezulu. Xa uhlalutya ukusilela unobangela wokuqhekeka kwebholithi yamandla aphezulu, kufunyaniswa ukuba umaleko we-decarbonization ukhona ekudibaneni kwentonga yentloko. Nangona kunjalo, i-Fe3C inokusabela nge-O2, i-H2O kunye ne-H2 kwiqondo lokushisa eliphezulu, okubangela ukunciphisa i-Fe3C ngaphakathi kwempahla ye-bolt, ngaloo ndlela ikhulise isigaba se-ferritic se-bolt kunye nokunciphisa amandla e-bolt material.
Ixesha lokuposa: Dec-26-2022