He pai te whakarewa reera mō te whakarewa i ngā momo rauemi. Nā te kaha nui o te reera me te tere whakarewa nui, ka iti haere te rohe whakarewa reera me te rohe e pāngia ana e te wera. Ka taea te whakarerekē i te hanganga matū o te whakarewa kia rite ki ngā whakaritenga rerekē o te hanganga whakarewa, ā, ka taea te whakatutuki i te mahi whakarewa pai rawa atu mā te whakahaere i ngā āhuatanga whakarewa.
maitai waro
He pai te kaha o te maitai waro iti me te maitai koranu iti, engari i te wā e whakamahia ana te whakarewa taiaho, kaua te ihirangi waro o te rauemi (te ōrite o te waro C) e neke ake i te 0.25%.
Tātai tātaitanga o te waro ōrite:
C=C%+Mn/6%+Ni/15%+Cr/13%+Cu/13%+Mo/4%
Mō ngā rauemi he nui ake te waro i te 0.3%, ka piki ake te auau o te pakaru makariri o te whakarewa. Mā te whakaaro ki tētahi whakahekenga o te whakarewa i roto i te hoahoa ka pai ake te whakaiti i te ahotea toenga me te auau o te pakaru i roto i te whakarewa me te rohe e pāngia ana e te wera. Ina whakarewahia ngā rauemi he nui ake te waro i te 0.3% me ngā rauemi he iti iho i te 0.3% te auau o te waro, he pai te whakarewa whakarara hei whakawhāiti i te whakawhiti martensite me te whakaiti i te whakaputanga o ngā pakaru. Ina nui ake te waro i te 0.3% te auau o te rauemi, mā te whakaiti i te tere tinei ka taea hoki te whakaiti i te auau o te pakaru.
Nā te mea he iti iho te pāmahana mimiti o te konutea (903℃) i te pāmahana rewa o te maitai (1535℃), ka puta he pūwero nui i roto i te whakarewa nā te mimiti o te konutea i roto i te tukanga whakarewa, nō reira he uaua ki te whakamahi i te whakarewa taiaho, inā koa te whakarewa wero. Inaianei kei te whakahaerehia he whakamātautau hei whakatakoto i te āputa 0.1mm i waenga i ngā rauemi o runga me raro hei tuku i te mamaoa konutea mai i te āputa. Engari he uaua ki te whakahaere i te āputa i roto i te hanga tuturu.
He pānga motuhake te nui o te whanariki me te whākōkī ki te pakaru o te whakarewa. Ko te maitai he nui ake te nui o te whanariki i te 0.04%, he nui ake rānei te nui o te whākōkī i te 0.04%, ka ngawari ki te pakaru i te wā e whakarewahia ana e te taiaho.
Nā te nui o te waro i roto i te mata o te maitai waro, he ngāwari ki te hanga kapiti totoka me te pakaru i roto i tepaparanga waro, kāore i te pai mō te whakarewa taiaho.
Wā tuku: Hepetema-28-2022
