Ka matapakihia e Rob Koltz rāua ko Dave Meyer ngā āhuatanga ferritic (aukume) me te austenitic (kore-aukume) o ngā maitai kore-waikura ka taea te whakarewa. Getty Images
Q: Kei te whakarewa ahau i tētahi tāke maitai kore-aukume 316. I tīmata ahau ki te whakarewa i ngā tāke wai ki te waea ER316L, ā, i kitea he aukume ngā whakarewa. Kei te hē taku mahi?
A: Kāore he mea hei manukanuka māu. He mea noa te kukume i te aukume i ngā whakarewa i hangaia ki te ER316L, ā, he maha ngā wā kāore e kukume i te aukume ngā rau kua hurihia me ngā rau 316.
He rerekē ngā āhua o ngā koranu rino i runga i te pāmahana me te taumata tāpiri, ko te tikanga he rerekē te whakaritenga o ngā ngota i roto i te konganuku. Ko ngā āhua e rua e tino kitea ana ko te austenite me te ferrite. Ko te austenite he kore-aukume, ko te ferrite ia he aukume.
I roto i te maitai waro noa, he āhua te austenite e noho ana i ngā pāmahana teitei anake, ā, i te whakamataotanga o te maitai, ka huri te austenite hei ferrite. Nō reira, i te pāmahana rūma, he aukume te maitai waro.
Ko ētahi momo maitai kore waikura, tae atu ki te 304 me te 316, e kiia ana he maitai kore waikura austenitic nā te mea ko tō rātou wāhanga matua he austenite i te pāmahana rūma. Ka whakapakeketia ēnei maitai kore waikura hei ferrite, ā, ka huri hei austenite ina whakamataohia. Ka tukuna ngā pereti me ngā rau maitai kore waikura austenitic ki ngā mahi whakamatao me te hurihuri e whakahaeretia ana, e huri ai te ferrite katoa ki te austenite.
I waenganui o te rautau 20, i kitea i te wā e whakarewahia ana ngā maitai kore waikura austenitic, ko te aroaro o ētahi ferrite i roto i te konganuku whakarewa ka ārai i ngā pakaru moroiti (ngatata) ka puta ina tino austenitic te konganuku whakakī. Hei ārai i ngā pakaru moroiti, ko te nuinga o ngā konganuku whakakī mō ngā maitai kore waikura austenitic kei roto i waenga i te 3% me te 20% te ferrite, nō reira ka kukume mai i ngā aukume. Inaa, ko ngā pūoko e whakamahia ana hei ine i te ihirangi ferrite o ngā whakarewa maitai kore waikura ka taea hoki te ine i te taumata o te kukume aukume.
E whakamahia ana te 316 i ētahi mahi ina hiahiatia kia whakaitihia ngā āhuatanga aukume o te whakarewa, engari he onge te hiahiatanga o tēnei i roto i ngā tāke. Ko tāku tumanako ka taea tonu e koe te whakarewa me te kore he raruraru.
Ko te WELDER, i mua ko Practical Welding Today tōna ingoa, e tohu ana i ngā tāngata tūturu e hanga ana i ngā hua e whakamahia ana e tātou, e mahi tahi ana hoki i ia rā, i ia rā. Neke atu i te 20 tau tēnei maheni e mahi ana ki te hapori whakarewa i Amerika Te Raki.
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