Ukuhluma kwe-fatigue crack of bolt:
Indawo yokuqala lapho i-crack yokukhathala iqala khona ibizwa ngokufanelekile ngokuthi umthombo wokukhathala, futhi umthombo wokukhathala uzwela kakhulu ku-microstructure ye-bolt futhi ungaqala imifantu yokukhathala ngesilinganiso esincane kakhulu. Ngokuvamile, phakathi kwamasayizi okusanhlamvu amathathu kuya kwamahlanu, inkinga yekhwalithi yebhawodi iwumthombo oyinhloko wokukhathala futhi ukukhathala okuningi kuqala endaweni yebhawodi noma ngaphansi.
Kodwa-ke, kunenani elikhulu lokuhlukaniswa kanye nezinye izakhi ze-alloying noma ukungcola ku-crystal ye-bolt material, futhi amandla omngcele wokusanhlamvu ahluke kakhulu, futhi lezi zici zingase ziholele ekuqalisweni kokukhathala kokuqhekeka. Imiphumela ibonisa ukuthi ukuqhekeka kokukhathala kujwayele ukwenzeka emingceleni yokusanhlamvu, ukufakwa kwendawo noma izinhlayiya zesigaba sesibili kanye nama-voids, konke okuhlobene nobunzima nokushintsha kwezinto. Uma i-microstructure yama-bolts ingathuthukiswa ngemva kokwelashwa kokushisa, amandla ayo okukhathala angakhuliswa ngezinga elithile.
Imiphumela ye-decarbonization ekukhathaleni:
I-decarburization yendawo ye-bolt inganciphisa ubulukhuni bobuso kanye nokumelana nokugqoka kwe-bolt ngemva kokucisha, futhi kunganciphisa ngempumelelo amandla okukhathala kwebhawodi. I-GB/T3098.1 indinganiso yokusebenza kwebhawodi yokuhlolwa kwe-decarbonization. Inani elikhulu lamadokhumenti libonisa ukuthi ukwelashwa okungalungile kokushisa kunganciphisa amandla okukhathala kwama-bolt ngokususa i-carburizing ebusweni nokunciphisa izinga eliphezulu. Lapho kuhlaziywa imbangela yokwehluleka kokuphuka kwebhawodi lamandla amakhulu, kutholakala ukuthi ungqimba lwe-decarbonization lukhona lapho kuhlangana khona induku yekhanda. Kodwa-ke, i-Fe3C ingasabela nge-O2, i-H2O ne-H2 ekushiseni okuphezulu, okuholela ekunciphiseni kwe-Fe3C ngaphakathi kwempahla ye-bolt, ngaleyo ndlela ikhulise isigaba se-ferritic sempahla ye-bolt futhi inciphise amandla wento ye-bolt.
Isikhathi sokuthumela: Dec-26-2022