Yuav Ua Li Cas Qhov Txias Txias Tom Qab Qhov Kawg Annealing ntawm Titanium Heater Tube (Cub Txias vs. Cua Txias) Hloov Kho Kev faib tawm ntawm Intermetallic Particles thiab Resistance rau Pitting hauv 10% Ferric Chloride?

Qhov loj thiab kev faib tawm ntawm cov khoom sib txuas (feem ntau Ti2Fe hauv Qib 2 titanium) yog tswj los ntawm tus nqi ntawm cov cua txias tom qab qhov kawg anneal. Kev ua kom txias qeeb (lub qhov cub txias, 1-5℃/ min) tso cai rau kev nthuav dav ntawm cov hlau thiab tsim cov loj, tsawg dua Ti2Fe hais. Ua kom txias dua (cua txias, 10-30 deg C / min)=ntau dua thiab me dua. Nws tau pom tias cov khoom tawg yooj yim zoo txo ​​qis pitting susceptibility nyob rau hauv ib puag ncig pitting ntawm 10% ferric chloride (FeCl3) ntawm 50℃los ntawm kev faib cov cathodic tam sim no ntau tus sib npaug txo qhov tsim ntawm cov khub niam txiv loj galvanic. Lub tshuab cua txias ua rau cov pitting tsis zoo dua li cua txias.

Cooling Rate tiv thaiv Quantitative Pitting Resistance

Qib 2 Ti, 10% FeCl 3, 50 degree, 100 teev:

Lub qhov cub txias, 1℃/ min. Ti2Fe, particle loj 3-8 µm, nrug 20-50 µm . 30-80 pits ib cm² pitting ceev. Qhov siab tshaj plaws qhov tob 80 mus rau 150 µm.

Cua txias: Cua-txias, 10℃/ min. Particle loj: 1-3um. Ntev: 10-20 hli Pitting ceev ntawm 10 mus rau 30 pits ib cm². Qhov tob ntawm 30 mus rau 80 µm.

Ntxuam txias (30℃/ min) Particle loj 0.5-1.5 µm nrug 5-10 µm. Pitting ceev ntawm 5-15 pits / cm 2 . Qhov tob ntawm 20-50 µm.

Dej quench (100℃/ min): particle loj<0.5 µm spacing <5 µm. Density of pits: 2 to 8 pits/cm2. Depth of pits: 10 to 30 µm.

Kev cuam tshuam ntawm Annealing Temperature

Annealing TemperatureCooling RateTi2Fe Particle Loj (µm) Pitting Ceev (pits / cm2)
650℃Cua txias 1-2 15-30 700℃Cua txias 1-3 10-25 750℃Cua txias 2-5 20-40 700℃Dej quench<0.5 5-15 Cooling Rate Selection Guide

Pom zoo tus nqi cua txias rau Ferric Chloride ServicePredicted Pitting Depth (mm/yr) Reasoning
Kev sib tshuam ( <100 teev / xyoo) Cua txias (10℃/ min) OK 0.2–0.4
Nruam, qis conc. (5%) 0.1-0.3 Zoo Cua txias
Tsis tu ncua, siab Concentration (10%) Ntxuam txias / dej quench 0.05 - 0.15 Zoo tshaj
Any with chloride >10,000ppm Dej quenching<0.10 Optimal
Kev pom zoo engineering.

Rau cov titanium raj hauv pitting ib puag ncig xws li ferric chloride, xyuas kom meej tias qhov txias txias yog ceev (kiv cua txias los yog dej quench) tom qab annealing zaum kawg los tsim kom zoo, zoo - dispersed Ti2Fe particles. Tus kws tshaj lij tuaj yeem tswj hwm tus nqi cua txias kom txhim kho pitting tsis kam.