It is also used to control the distortion by reducing the thermal gradient since dL=α * L * dt
Too fast colling rate promotes martensite formation
If there is a risk of hydrogen entrapment, then the best way to remove it is the hydrogen back out treatment (200 degC)
Στις Κυρ, 9 Σεπ 2018 στις 1:01 μ.μ., ο/η Souravbohray <ermechsouravbohray@gmail.com> έγραψε:
what is use of preheating ?
how can control rate of cooling by preheating ? by apply of heat how cooling rate can be control ?
by preheat hardness increase or decrease?
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Dr. Georgios Dilintas,
Dipl. Ing. In Aeronautic and Space Engineering
Ph.D in Mechanics of Solids - Computational Mechanics
A.I.S, A.N.I, IRCA Lead Auditor
Welding, Stress Analysis, Corrosion, QA/QC, Failure Analysis, Risk Analysis
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