Ukuphonsa endaweni egobayo noma yokuqondisa kuzophinde kubangele inkinga yokuqhekeka onqenqemeni ngesikhathi sokuguqulwa kokukhetha.ipayipi elingenamthungo.
I-0Cr15mm9Cu2nin ne-0Cr17Mm6ni4Cu2N insimbi engagqwali ingeyensimbi engenasici engu-200 ye-austenitic, ehlukile kuchungechunge lwendabuko lwama-200 kanye nochungechunge lwe-austenitic engama-300.insimbi engagqwali. Lolu hlobo200insimbi engagqwali square tubeijwayele ukuqhekeka onqenqemeni, imifantu engaphezulu, Inkinga yekhwalithi embi yokubumba yomonakalo onqenqemeni. Ekukhiqizeni kwangempela okushisayo okushisayo, izinhlobo ezimbili zensimbi zisebenzisa ama-curve okushisa ama-200, futhi izinga lokushisa lomlilo lilawulwa ku-1215-1230C. Uhlelo lwayo olushisayo lisebenzisa imodeli yekhompiyutha yezinga lesibili elithi "Rough Rolling Regulations" kanye "Finish Rolling Regulations". 800-1020C. Ibhekisela kunqubo yangempela yokugoqa okushisayo kokukhetha okubiliipayipi elingenamthungo, yenze isistimu yokushisisa kanye nezinga lokushisa lokuguquguquka lale ndlela yokuhlola, bese senza uhlolo olulingiswa lokuginqika olushisayo kudivayisi yokuhlola ukugoqa okushisayo eklanywe futhi yakhiqizwa yithi. Ulwazi lwanamuhla lwenhlangano yamapayipi ayisikwele: kusetshenziswa inqubo yokucwenga ye-AOD+LF ukukhiqiza i-0Cr15Mm9Cu2Nn kanye ne-0Cr17I6ni4Cu2N yokukhetha okungenayo i-vascular okuqhubekayo kokusakazwa okubi okuqhubekayo ngenqubo yokugoba eqondile eqhubekayo yokuphonsa, usayizi wesigaba esiphambanayo wokuphonsa okubi okuqhubekayo ngu-1220m. Ingxenye enkulu engu-% iboniswa kuthebula. I-microstructure yegobolondo elibi ekujuleni okuhlukile okungu-0Cr15m9Cu2Nn okwenziwa nge-asidi okuqhubekayo okungenamithambo, njengoba kuboniswe emfanekisweni, kuhambisana nokujula kwegobolondo elibi elilinge. Uma kwenzeka isimo esingavamile futhi izinga lokushisa lonqenqema lokulingisa lihluleka ukwehla liye ebangeni lezinga lokushisa eliphansi le-brittle range. I-microstructure ku-15 no-25m. Ukuma kwe-microstructure kanye nosayizi wokusanhlamvu we-20g high-pressure boiler tube kuzokhula ngokujula kwegobolondo le-slab. Izinguquko, kodwa zibonise umehluko othile. Ekujuleni kwegobolondo elingu-d0m, i-microstructure ngokuyinhloko iyisakhiwo se-dendrite sohlobo lwamathambo, kanti isikhala se-dendrite esiyinhloko nesesibili sincane. Ku-d5mm, ikakhulukazi isakhiwo se-dendrite.
Isikhala se-dendrite sikhulu. Ku-d>15mn, ama-dendrite afana nezikelemu, kodwa ku-d25m, ikakhulukazi amakristalu amaselula. I-microstructure ye-Cr17Im6ni4Cu2N yesikwele seshubhu ye-slab eqhubekayo yokuphonsa ku-Fig. 1 ibonisa ukuthi igobolondo elibi eliqhubekayo ngokuyisisekelo liyisakhiwo se-dendrite. Nakuba kunomehluko othile ku-morphology ye-dendrite, ukwakheka kwayo ikakhulukazi kwakhiwe i-matrix ye-austenite empunga, kanye ne-ferrite emnyama. Njengeshubhu lesikwele esingu-0Cr15Mn9Cu2Nin, njengoba ukujula kwegobolondo kukhula, isikhala se-dendrite esiyinhloko nesesibili siyakhula kancane kancane, futhi ukwakheka kwe-dendrite kuyashintsha kusuka kuhlaka lwamathambo kuya ekubeni isikelemu. , ukuziphatha kwepulasitiki enqubweni yokuguqulwa kwesigaba se-martensitic kumapayipi ensimbi ayinhlanganisela amelana nokugqokwa kwahlaziywa ngokuhlolwa, futhi usayizi wokusanhlamvu we-austenite kanye nomthetho wayo wokukhula okusanhlamvu kwe-austenite, i-martensite orientation, ukuguqulwa kwe-plasticity kwesigaba, Imithelela yengcindezi kanye ne-morphology kuzakhiwo zemishini. wamapayipi ensimbi ayinhlanganisela angagugi. Ngaphansi kwesimo sokushisa kwe-1010 austenitization 15mir, indawo yokushisa yokuqala s kanye nephuzu lokushisa lokugcina ㎡ lokukhuphuka kwenguquko ye-martensitic ngokukhuphuka kwezinga lokushisa le-austenitization, kanye nemingcele kumodeli yepulasitiki yokuguqulwa kwesigaba yokuguqulwa kwepayipi lensimbi elihlanganisiwe eliguga ngokukhuphuka okwandisa ukucindezeleka okulingana. Lapho izinga lokushisa le-austenitization lingaphansi kuka-1050C, ukukhula okusanhlamvu kubonisa inqubo evamile yokukhula. Ngokukhula kwesikhathi se-austenitization, insimbi eyindilinga iyanda. -Isifanisi esishisayo esingu-3500, ukuziphatha kwepulasitiki kwepayipi elihlanganisiwe lensimbi elingagugi phakathi nenqubo yokuguqulwa kwe-martensitic kwahlaziywa ngokuhlolwa, futhi usayizi wokusanhlamvu we-austenite kanye nomthetho wayo wokukhula okusanhlamvu kwe-austenite kwacwaningwa, kanye ne-martensite Effects of orientation, i-plasticity yokuguqulwa kwesigaba, ukucindezeleka kanye ne-morphology kuzakhiwo zemishini zamapayipi ensimbi ayinhlanganisela angagugi. Ngaphansi kwesimo se-1010 austenitization imizuzu engu-15, izinga lokushisa lokuqala s kanye nephuzu lokushisa lokugcina ㎡ lokukhuphuka kokuguqulwa kwe-martensitic ngokukhuphuka kwezinga lokushisa le-austenitization, kanye nepharamitha K kumodeli ye-plasticity yesigaba sokuguqulwa kwepayipi lensimbi elingagugi likhuphuka ukucindezeleka okulingana. Lapho izinga lokushisa le-austenitizing lingaphansi kuka-1050C, ukukhula okusanhlamvu kubonisa inqubo evamile yokukhula. Njengoba isikhathi se-austenitizing sikhula, Ingabe siyakhula, futhi ukuguqulwa kwesigaba se-B kuhlukaniswe imingcele yokusanhlamvu. I-nucleation nokukhula kwezigaba futhi Kunezigaba ezimbili ze-nucleation nokukhula kwe-Widmanite a. isigaba. Uma izinga lokupholisa lenyuka lisuka ku-0.1C/s liya ku-150C/s, inqubo yokuguqulwa kwesigaba sika-B+a kanye + yenzeka ikakhulukazi ku-alloy ye-Ti-55. Izinhlamvu ezisepayipini lensimbi elihlanganisiwe elingagugi zisengahlala zifana futhi zincane, futhi i-martensite Fine coherent complex complex carbides yawa ngaphezulu. Kusetshenziswa isibonakhulu se-electron yokudlulisa, isithwebuli se-electron microscope, i-x-ray diffractometer kanye nezindlela ze-electrochemical ukutadisha isakhiwo se-microstructure kanye nezakhiwo ze-electrochemical zamapayipi ensimbi amelana nokugqokwa ezifundazweni ezahlukene ezifana ne-cast state, isimo se-homogenized, kanye nesimo semoto, kanye ne-electron probe EPM. i-morphology kanye nokwakheka kwemvula eyinhloko epayipini lensimbi elingagugi elifakwe ku-150-300C kuphenywe ngokuhlaziywa kwe-spectrum yamandla.
Isikhathi sokuthumela: Mar-30-2023