Ukuveza Umqondo Wokumelana Nokugqwala Ngemuva Kwe-GR7 Alloy ene-0.2% Yengezo

Ukuveza Umqondo Wokumelana Nokugqwala Ngemuva Kwe-GR7 Alloy ene-0.2% Yengezo

I-Baoji Dong Intertech Metal Materials Co., Ltd. yinkampani ekhethekile ekukhiqizeni izinto ze-titanium. Ngolwazi olunothe embonini, ingakwazi ukwenza ngokwezifiso izinhlobo ezahlukene namazinga wezinto ze-titanium ezinkampanini ezinkulu. Siyamukela bonke abangane bazo zonke izigaba zomphakathi ukuthi babuze.

Labamba abasebenza ngezinto ezingagqwali (corrosion-resistant materials) zamakhemikhali, sicela nime kancane. Namuhla, asikhulume nge-GR7. Sizochaza ngokuphelele i-American standard GR7 UNSR52400 ngokombono we-metallographic conditions. Sizokhuluma kuphela ngezinto eziyinhloko ezisezingeni (standard). Ake siqale ngomqondo wokwakheka (composition logic). Isekelwe ku-GR2 futhi yengeza i-0.12% kuya ku-0.25% ye-target, okungagcini nje ngokuthuthukisa amandla okumelana nokuncipha kwezinto (substance reduction), kodwa inhloso eyinhloko ukunciphisa i-hydrogen overpotential futhi ivimbele i-crevice corrosion kanye ne-pitting corrosion. Nansi imininingwane. Ngenxa yokwengezwa kwe-target, umkhawulo ophezulu we-iron impurity ku-GR7 ukhululiwe uye ku-0.3%, okulula kakhulu ekulawuleni ukuguquguquka kokushisa (thermal processing plasticity) kune-GR2 engu-0.2%. Manje asibheke izakhiwo zemishini (mechanical properties). Esimweni se-annealed, amandla okudonsa (tensile strength) angaphezu noma alingane no-345 MPa, amandla e-yield angaphezu noma alingane no-275 MPa, futhi ukunwebeka (elongation) kungaphezu noma kulingane no-20%, kodwa labo abanolwazi bayazi ukuthi ukubaluleka kwedatha yasekamelweni akukho lukhulu. Into esemqoka ukuthi ku-300°C, amandla ayo okusebenza okugcina (ultimate application force) asengahlala ngaphezu kuka-119 MPa, futhi kuleli zinga lokushisa, isagcina cishe u-85% wamandla asekamelweni, yilokho okuyimfucumfucu eyinhloko yokuthi ifakwe emidwebeni yemikhumbi yengcindezi (pressure vessel drawings) futhi isetshenziswe njengamashubhu okushintshana ukushisa (heat exchanger tube bundles). Asikhulume ngokusebenza kokusika (cutting performance). Ukushisa kwe-GR7 kungu-16 W/(M.K) kuphela, futhi ukusakazeka kokushisa kuhamba kancane kakhulu. Ukusika akukwazi ukususa ukushisa ngokuphelele, ijubane lomugqa (linear speed) kufanele licindezelwe libe ngama-30-50 metres ngomzuzu, futhi kufanele lihlangane noketshezi olukhethekile lokupholisa lwe-titanium alloy enengcindezi ephezulu. Ngaphandle kwalokho, kuzoba nokugeleza kwe-slag ngokushesha nokwehluleka kwethuluzi. Okwesibili, ukushisela (welding) kufanele kulandele ngokuqinile i-NB/T47015. Izinga lokushisa phakathi kwezendlalelo (interlayer temperature) akumele lidlule ku-150°C, futhi ubumsulwa be-argon gas yokuvikela ngemuva kufanele bufinyelele ku-99.99%, ngisho no-99.9% akwamukelekile. Ukuqonda okufushane nge-light weight embrittlement. Ngemva kokushisela, kunconywa ukushisisa ku-400°C ihora eli-1, ugcine ihora eli-1 ukuze wenze i-stress relief annealing ukuze ubuyisele ukuguquguquka (plasticity). Ekugcineni, ake silungise iphutha lokukhetha. I-GR7 ingeyesinhlobo se-near-pure titanium α-type alloy. Ayikwazi ukuqiniswa ngokusebenzisa i-solid solution aging, i-cold work hardening iyona kuphela indlela yayo yokuqinisa. Ungalindeli ukuyithatha esikhundleni se-TC4 ukuze ithwale umthwalo. Inkundla yayo enkulu icacile, izimo ezinciphisa i-medium ezifana ne-acetic acid ne-formic acid environments zamashubhu okushintshana ukushisa (heat exchanger tubes) ne-heads.