Tshuaj muaj pes tsawg leeg ntawm nickel - Kev Paub

1.Dab tsi yog cov ntsiab lus npib tsib xee ntawm Incoloy 825 alloy phaj?

Nickel cov ntsiab lus ntau ntawmIncoloy 825 alloy phajyog nruj me ntsis txhais raws li38.0% -46.0% los ntawm qhov hnyav, raws li kev lees paub thoob ntiaj teb cov qauv kev lag luam suav nrogASTM B 424 2(Standard Specification for Nickel-Iron-Chromium-Molybdenum-Columbium Alloy Phaj, Ntawv, thiab Sawb) thiabASME SB424. Nickel yog qhov tseem ceeb alloying ntawm Incoloy 825; Cov ntsiab lus tshwj xeeb no ua rau cov hlau tsis muaj qhov tshwj xeeb rau kev tiv thaiv corrosion, pitting, crevice corrosion, thiab kev ntxhov siab corrosion tawg hauv cov xov xwm hnyav xws li sulfuric acid, phosphoric acid, thiab chloride - muaj cov kev daws teeb meem. Lub caij no, nws tuav lub alloy siab siab -kub txhua yam stability thiab toughness, ua rau nws haum rau kev pab nyob rau hauv ob qho tib si ambient kub thiab siab kub ib puag ncig.

2.Dab tsi yog tus qauv tswj cov ntsiab lus carbon rau Incoloy 825?

Cov ntsiab lus carbon ntawmlus 825yog nruj me ntsis tswj rau qhov siab tshaj plaws ntawm0.05% ntawm qhov hnyavRaws li kev tswj hwm los ntawm cov qauv xws li ASTM B424 thiab ASME SB424. Qhov kev txwv nruj ntawm cov ntsiab lus carbon ua rau ob qho tseem ceeb thiab tsis tuaj yeem hloov pauv kev ua haujlwm:

Kev tiv thaiv ntawm intergranular corrosion: Thaum lub sij hawm vuam txheej txheem los yog ntev - lub sij hawm kev pab cuam nyob rau hauv nruab nrab kub (feem ntau ntawm 427℃thiab 815 degree), cov pa roj carbon ntau heev yuav hnov mob nrog chromium nyob rau hauv cov alloy los tsim chromium carbides (piv txwv li, Cr₂₃C₆) thiab nag los raws cov ciam teb nplej. Cov nag lossis daus no depletes cov chromium cov ntsiab lus nyob rau hauv cov matrix uas nyob ib sab, tsim kom muaj "chromium-depleted zone" uas yog heev raug rau corrosion. Los ntawm kev txwv cov pa roj carbon tsawg dua los yog sib npaug li 0.05%, qhov tsim ntawm cov chromium carbides zoo inhibited, yog li khaws cia cov hlau tsis zoo corrosion kuj thiab zam kev puas tsuaj intergranular corrosion tsis ua hauj lwm hauv kev ua haujlwm corrosive.

Txhim kho ntawm weldability: Cov ntsiab lus carbon tsawg txo qhov kev pheej hmoo ntawm kev tsim cov theem nkig (xws li martensite los yog lwm yam nyuaj thiab nkig intermetallic compounds) nyob rau hauv vuam kub- cuam tshuam cheeb tsam (HAZ) thaum vuam. Qhov no ua kom ntseeg tau tias cov pob qij txha welded khaws cov khoom siv kho tshuab (xws li, lub zog tensile, ductility, thiab cuam tshuam toughness) thiab corrosion kuj uas yog piv rau lub hauv paus hlau. Nws kuj tseem txo qis qhov nyiam ntawm kev sib tsoo, ua kom yooj yim rau kev ua haujlwm vuam thiab txhim kho kev ntseeg tau ntawm cov qauv welded ua los ntawm Incoloy 825.