ʻO ka Duplex stainless steel he ʻelua-phase microstructure, kahi o ka hapa nui o ka ferrite a me ka austenite ma kahi o 50%.Ma muli o kā lākou microstructure ʻelua-phase, ua hoʻohui kēia mau kila i nā waiwai maikaʻi loa o nā kila kila ferritic a me austenitic.Ma keʻano laulā, hāʻawi ka ferritic phase (ke kino-centered cubic lattice) i ka ikaika mechanical kiʻekiʻe, ka paʻakikī maikaʻi a me ka pale ʻana i ka corrosion maikaʻi, ʻoiai ʻo ka austenitic phase (face-centered cubic lattice) hāʻawi i ka ductility maikaʻi.
Ma muli o ka hui pū ʻana o kēia mau waiwai, ua hoʻohana nui ʻia nā duplex stainless steels i ka petrochemical, pulp a me ka pepa, moana a me nā ʻoihana ikehu.Hiki iā lākou ke pale i nā kaiapuni koʻikoʻi, hoʻonui i ke ola lawelawe a hana i nā kūlana kaiapuni.
ʻO nā mea ikaika kiʻekiʻe e ho'ēmi i ka mānoanoa a me ke kaumaha o ka'āpana.No ka laʻana, hiki i ka super duplex stainless steel ke hāʻawi i ʻekolu a ʻehā mau manawa o ka ikaika o ka hoʻoulu ʻana a me ke kūpaʻa pitting o 316 stainless steel.
Hoʻokaʻawale ʻia nā kila kila ʻole Duplex i ʻekolu mau māka e pili ana i ka gravimetric chromium (Cr) content a me ka pitting resistance equivalent number (PREN):
ʻO kekahi o nā mea koʻikoʻi o ka welding DSS, SDSS, HDSS a me nā mea kila kila kila kūikawā, ʻo ia ka hoʻomalu ʻana i nā ʻāpana welding.
ʻO nā koi no ke kaʻina hana wili i ka ʻoihana petrochemical e kuhikuhi i ka PREN liʻiliʻi e pono ai no nā metala hoʻopiha.No ka laʻana, makemake ʻo DSS i kahi waiwai PREN o 35, ʻoiai koi ʻo SDSS i kahi waiwai PREN o 40. Hōʻike ʻo 1 i ka DSS a me kāna mea hoʻopiha piha no GMAW a me GTAW.E like me ke kānāwai, pili ka ʻike Cr i loko o ka metala hoʻopiha me ka ʻike Cr i ka metala kumu.ʻO kahi ala e noʻonoʻo ai i ka wā e hoʻohana ai i ka GTAW no nā aʻa a me nā kahawai wela ka hoʻohana ʻana i nā metala hoʻopiha piha.Inā like ʻole ka weld metala ma muli o ka ʻenehana maikaʻi ʻole, hiki i kahi mea hoʻopihapiha hoʻopihapiha hoʻopihapiha ke hāʻawi i ka PREN makemake a me nā waiwai ʻē aʻe no ke ʻano weld.
E like me ka laʻana, e hōʻike i kēia, manaʻo kekahi mau mea hana e hoʻohana i ka uea hoʻopiha SDSS (25% Cr) no DSS (22% Cr) nā mea hoʻohui a me ka HDSS (27% Cr) uea hoʻopiha no SDSS (25% Cr).Hiki ke hoʻohana ʻia ka uea hoʻopihapiha HDSS no nā alloys HDSS.Aia kēia austenitic-ferritic duplex ma kahi o 65% ​​ferrite, 27% chromium, 6.5% nickel, 5% molybdenum a ua manaʻo ʻia he emi ma lalo o 0.015% kalapona haʻahaʻa.
Ke hoʻohālikelike ʻia me SDSS, ʻoi aku ka ikaika o ka hoʻopili ʻana o HDSS a ʻoi aku ka maikaʻi o ka pale ʻana i ka pitting a me ka corrosion crevice.He kiʻekiʻe aʻe kona kūʻē ʻana i ka haki ʻana i ke koʻikoʻi o ka hydrogen a ʻoi aku ke kūʻē ʻana i nā wahi ʻakika ikaika ma mua o SDSS.ʻO kona ikaika kiʻekiʻe, ʻo ia ka emi ʻana o nā kumukūʻai mālama i ka hana paipu, no ka mea, ʻaʻole pono ka weld metala o ka ikaika kūpono i ka nānā ʻana i ka element finite a me nā pae ʻae ʻae hiki ke emi i ka conservative.
Hāʻawi ʻia i ka laulā o nā mea kumu, nā koi mechanical a me nā kūlana hana, e ʻoluʻolu e kamaʻilio me kahi loea noi DSS a me ka hoʻopihapiha hoʻopihapiha ma mua o ka hoʻomaka ʻana i kāu papahana aʻe.
ʻO WELDER, i kapa mua ʻia ʻo Practical Welding Today, e hōʻike ana i ka poʻe maoli e hana i nā huahana a mākou e hoʻohana ai a hana pū me kēlā me kēia lā.Ke lawelawe nei kēia nūpepa i ke kaiāulu wiliwili ma ʻAmelika ʻĀkau no nā makahiki he 20.
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