Kua piki haere te whakamahinga o ngā paipa kowiri tira ināianei, nā tōna ātete pai ki te waikura kua whai wāhi nui ia ki te hanga hangarau, i roto i te tukanga whakaputa me whai otinga totoka mō te tukatuka i ngā ngongo kowiri tira, ko te kaupapa matua ko te whiwhi i tētahi martensite hei whakanui i te pakeke o ngā hua, me titiro tātou ki te otinga o te tukatuka ngongo kowiri tira:
(1) I muri i te maimoatanga o te otinga, ka whakamahanahia ki te (760±15) ℃, ā, ka whakaitihia te nui o te waro me ngā huānga whakarewa i roto i te ngongo maitai kore waikura austenitic 904L nā te maturuturunga iho o te karawiti Cr23C6 mai i te ngongo maitai kore waikura austenitic 904L mō te 90 meneti, kia piki ake ai te pūwāhi Ms ki te 70℃, kātahi ka whakamataohia ki te pāmahana rūma kia whiwhi ai i te hanganga martensite + αferrite + toenga austenitic. I wetekina te toenga austenite mā te pakeketanga i te 510℃.
(2) i muri i te whakatikatika pāmahana teitei me te maimoatanga cryogenic, i whakamahanahia tuatahitia te otinga ki te 950℃ ka puritia mō te 90 meneti. Nā te pikinga o te pūwāhi Ms, i taea te whiwhi i tētahi iti o te martensite i muri i te whakamatao ki te pāmahana rūma. I muri i tēnā, ka taea te whiwhi i tētahi nui o te martensite mā te maimoatanga matao -70℃ ka puritia mō te 8 hāora.
(3) I muri i te maimoatanga o te otinga mā te tikanga whakarerekētanga matao, ka whakarerekētia te martensite i hangaia e te ngongo tuimotu 904L i te pāmahana rūma. Ko te nui o te martensite i hangaia e te ngongo tuimotu 904L i te wā whakarerekētanga matao e pā ana ki te nui o te whakarerekētanga me te hanganga o te ngongo maitai kore waikura 904L.
Ko ngā tikanga e toru i runga ake nei e whakamahia whānuitia ana, ko te tumanako ka āwhina i a koe.
Wā tuku: Hanuere-29-2023