Mmepụta nke HIC Resistant Steels
Hydrogen induced cracking (HIC) na-anọchite anya ihe ịma aka a na-enwekarị, karịsịa na mmanụ ala na ụlọ ọrụ nnụcha ebe ịdị ọcha na n'ozuzu ogo nke ígwè dị oke mkpa.
Usoro mmepụta maka nchara na-eguzogide HIC na-agụnye usoro desulphurization dị egwu gụnyere ntụtụ nke magnesium na ịkpali site na ntụtụ argon ala.
Mmepụta nchara dị ọcha na-adabere na teknụzụ iji chịkwaa na / ma ọ bụ wepụ ihe ntinye na nchara. Ọtụtụ mgbe, ụdị na njirimara nke ntinye ndị na-abụghị metallic inclusions na ígwè nwere mmetụta dị ukwuu na ihe eji arụ ọrụ nke ígwè ahụ ma chọpụtakwa ịdị ọcha nke ígwè ahụ. Ya mere, nyocha nke ọma nke njirimara ndị a dị mkpa iji kwalite usoro nchara iji mepụta nchara dị mma.
Hydrogen induced cracking (HIC) na sulphide stress cracking (SSC) na-anọchi anya ụdị abụọ nke mmebi hydrogen kpasuru nke a na-ezutekarị na ụlọ ọrụ mmanụ na mmanụ ọkụ. N'okwu nke mbụ (HIC), a na-aghọtakarị na nguzogide ígwè na-adabere karịsịa na njirimara microstructural ha - ntinye ndị na-abụghị ígwè na nkewa nkewa.
A na-ahụta sulfide manganese elongated dị ka saịtị mmalite kachasị dị ize ndụ. N'okwu nke abụọ (SSC), a kwenyere na nguzogide nke ígwè nwere ike ịkacha mma na ọkwa ike ha ebe njirimara microstructure adịghị mkpa. A na-etinye akwụkwọ a na-ewepụta maka ọmụmụ nke HIC na SSC na carbon-manganese steels, nke dị iche na ọgwụgwọ okpomọkụ ha (microstructure, ọkwa nke ihe eji arụ ọrụ) na ịdị ọcha ha.
Ntinye MnS bụ ihe mmalite kacha emerụ ahụ maka HIC, yabụ, dịka ihe nlere, ọdịnaya sọlfọ ga-ebelatarịrị maka igwe eji eme gburugburu acidic. N'ihi ọganihu a na-eme na nhazi ígwè, enwere ike ibelata ọdịnaya sulfur ruo n'ogo dị ala; n'okpuru 0.0008 wt. % (8pm).
A na-etinyekarị ọgwụgwọ ca iji gbochie nguzobe elongated MnS yana ịchịkwa nsonye sulfide n'ụdị okirikiri, yana ọ bụrụ na enwere ọdịnaya Ca kwesịrị ekwesị maka ihe mgbochi mgbape. Ọ bụrụ na ọdịnaya Ca dị elu ma e jiri ya tụnyere ọdịnaya S, ngafe Ca nwere ike ịmepụta oxides nke nwere ike rụọ ọrụ dị ka onye mmalite nke HIC. Ewebata ọtụtụ paramita ndị na-anọchi anya ọdịnaya Ca dị irè, yana ọdịnaya Ca kwesịrị iji nlezianya chịkwaa ya na nso nso dị warara; ọmụmaatụ, 3
Tebụl 1: Ihe mejupụtara kemịkalụ chọrọ maka ígwè ọkpọkọ dị elu, [ppm]
Ọgụgụ 1 na-egosi ụzọ maka mmepụta ígwè na-eguzogide HIC. Tupu usoro BOF, a na-eme ka ígwè na-ekpo ọkụ na-ekpo ọkụ na-ekpo ọkụ n'ọdụ ụgbọ mmiri na-ekpo ọkụ site na ntinye nke magnesium na CaO. Na BOF, naanị ihe mkpofu nwere sọlfọ dị ala ka a ga-ana. A na-agbakwunye aluminum maka deoxidation na ihe ndị na-emepụta slag n'oge ịpị. A na-ahazikwa isi alloy n'oge ahụ.
A na-ebuga ladle ahụ gaa n'ọdụ ụgbọ mmiri ebe a na-afụ argon site na elu elu ka ọ gwakọta ígwè na slag maka nzube nke desulphurization. Mgbe ahụ, a na-ebufe ladle maka ọgwụgwọ agụụ. A na-akpali ígwè ahụ site na ntụtụ argon nke ala iji mesie desulphurization miri emi na ikuku mmiri.