Dab tsi yog Ib co Hnav -Resistant Nickel Alloys Khoom?

 

Dab tsi yog hnav-resistant nickel alloy?

 

Hnav-cov nickel resistant yog ib chav kawm ntawm siab- cov khoom siv hlau ua tau zoo uas siv npib tsib xee los ua lub hauv paus thiab ntxiv ntau yam alloying ntsiab (xws li chromium, molybdenum, tungsten, niobium, hlau, thiab lwm yam) thiab tau txais kev kho tshwj xeeb ntxiv dag zog, yog li ua pov thawj zoo heev nyob rau hauv hnyav hnav ib puag ncig.

 

Hnav-cov nickel alloys tiv taus yog suav tias yog ib qho ntawm "cov ntaub ntawv kawg" rau kev daws qhov teeb meem peb zaug ntawm qhov kub siab, corrosion, thiab hnav. Lawv qhov kev ua tau zoo tshaj plaws yog los ntawm kev sib xyaw ua ke ntawm cov alloy tsim thiab microstructure tswj. Thaum xaiv cov alloys no, kev sib raug zoo nrog cov neeg muab khoom lossis engineers yog qhov tseem ceeb, suav nrog kev ua haujlwm tshwj xeeb (T, P, media) thiab hom tsis ua haujlwm, rau kev xaiv thiab kuaj.

 

Cov ntaub ntawv no tsis tsuas yog tau txais txiaj ntsig zoo heev -kub tsis kam, tiv thaiv corrosion, thiab zoo toughness ntawm npib tsib xee-raws li alloys, tab sis kuj muaj zoo heev tiv taus hnav, khawb, corrosion, thiab fretting puas los ntawm tej alloy tsim thiab ntxiv zog mechanisms. Cov ntaub ntawv no tau siv dav hauv kev ua haujlwm hnyav heev. Peb yuav piav qhia txog qhov tseem ceeb ntxiv dag zog thiab hnav- cov txheej txheem tiv thaiv, nrog rau kev hnav zoo ib yam- cov tsev neeg nickel alloy resistant thiab cov qib raug, thiab lwm yam.

 

Lub ntsiab ntxiv dag zog thiab hnav tsis kam mechanisms

 

Txhim kho cov txheej txheem hais txog "yuav ua li cas kom nws muaj zog"; hnav- tiv thaiv mechanisms chaw nyob "yuav ua li cas tiv hnav." Cov plaub hauv qab no yog hom kev ntxiv dag zog thiab hnav- cov ntaub ntawv tiv taus:

 

1. Solid Solution Strengthening:Ntxiv cov tshuaj xws li molybdenum, chromium, tungsten, thiab cobalt kom ntxiv dag zog rau matrix.

 

2. Theem Thib Ob Strengthening (Precipitation Hardening):

• 'Phase [Ni₃(Al, Ti)]:Lub ntsiab ntxiv dag zog rau cov khoom siv xws li Inconel 718 thiab X-750, muab lub zog kub kub.
• Carbides / Borates:Xws li chromium carbides (piv txwv li, Cr₇C₃, Cr₂₃C₆) thiab molybdenum / tungsten carbides, uas yog cov khoom tawv uas ncaj qha tiv thaiv hnav. Piv txwv xws li carbides hauv Hastelloy C-276 thiab Stellite alloys.

 

3. Intermetallic Compound Strengthening:Xws li Ni₃Si thiab Laves theem.

 

4. Ua hauj lwm hardening:Qee cov alloys (xws li Monel K-500) tuaj yeem ua rau lawv qhov tawv tawv tau nce ntxiv los ntawm kev ua haujlwm txias.

 

Kev coj zoo-cov qib nickel alloy resistant thiab lawv daim ntawv thov

 

1. Hom Hom: Nickel-Chromium-Molybdenum Alloys (Corrosion thiab Wear Resistant)

 

• Cov yam ntxwv tseem ceeb thiab hnav tsis kam Mechanism:Tsis tshua muaj siab tsis kam mus rau kev xeb dav dav (tshwj xeeb tshaj yog sib xyaw redox acids), ntxiv dag zog nrog molybdenum thiab chromium los ntawm kev daws teeb meem, thiab carbides muab kev hnav tsis kam.

 

• Cov ntawv thov tseem ceeb:Chemical twj thiab li qub, agitators, reactor internals, flue gas desulfurization systems, thiab daim ntawv kev lag luam.

 

 

2. Hom Hom: Nickel-Copper Alloys (Monel Alloys)

 

• Main Properties thiab Wear Resistance Mechanism:Zoo heev tiv thaiv dej hiav txwv, sulfuric acid, thiab hydrofluoric acid corrosion. K-500 tuaj yeem ua tiav qhov tawv tawv dua los ntawm lub hnub nyoog hardening ( nag lossis daus ntawm Ni₃ (Ti , Al)) thiab ua haujlwm txias.

 

• Cov ntawv thov tseem ceeb:Marine engineering Cheebtsam, twj tso kua mis shafts, li qub, scrapers, ntsia hlau conveyors.

 

 

3. Hom Hom: Hom dej nag los nag (High-Temperature Wear Resistance)

 

• Cov yam ntxwv tseem ceeb thiab hnav tsis kam Mechanism:Lub zog siab heev yog ua tiav los ntawm 'theem thiab 'theem aging nag lossis daus; zoo siab -kub stability; tiv taus fretting hnav thiab qaug zog hnav.

 

• Cov ntawv thov tseem ceeb:Aero- cav hniav, turbine disks, fasteners, siab - kub tuag, thiab extrusion screws.

 

 

 

4. Hom Hom: Austenitic Stainless Steel Evolution (High Strength and Wear Resistance)

 

• Cov yam ntxwv tseem ceeb thiab hnav tsis kam Mechanism:Siab -nitrogen austenitic stainless hlau, tab sis nrog cov ntsiab lus siab nickel (~ 8.5%). Lub zog siab thiab hnav tsis kam yog ua tiav los ntawm kev kho nitrogen tov thiab ua haujlwm txias, ntawm tus nqi qis.

 

• Cov ntawv thov tseem ceeb:Unlubricated bearings, hnav rings, fasteners, thiab cov khoom ua zaub mov.

 

 

 

Cov kev txiav txim siab tseem ceeb rau kev xaiv hnav- cov nickel resistant

 

1. Hnav hom:Puas yog abrasive hnav, erosion, nplaum hnav, lossis fretting hnav?

2. Ib puag ncig nruab nrab:Kub, siab, muaj cov kua qaub, alkalis, ntsev, oxides, sulfides, thiab lwm yam.

3. Mechanical Requirements:Yuav tsum tau hardness, lub zog, toughness, thiab cuam tshuam load kuj.

4. Cov txheej txheem tsim khoom:Puas yog ib qho khoom casting / forging yuav tsum tau, los yog tsuas yog ib qho chaw weld overlay / thermal spray txheej?

5. Tus nqi -effectiveness:Txawm hais tias cov nickel alloys kim, lawv lub neej ntev thiab cov nqi kho mob tsawg feem ntau pheej yig rau cov khoom siv tseem ceeb.