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Quick HT Quiz #14 Which of the following type of Powder Metallurgy (PM) parts are more prone to cracking during induction hardening? Options: a) Low Density PM parts b) High Density PM parts c) Both low and High Density PM parts are prone to cracking d)... Read More

Today, we will discuss the importance of flame curtains and pilot flames in atmosphere gas carburising furnaces. As we know the gas carburising atmosphere consists of various gases and one of the most important ingredient is Carbon Monoxide. However, Carbon monoxide is a highly poisonous and... Read More

Quick HT Quiz #13 Approximately how much quantity of martempering salt will be required in the salt bath volume is 1000 Litres? Options: a) 2000 Kg b) 1500 Kg c) 1000 Kg d) 500 Kg Please stay tuned and subscribe to this blog for more quiz on heat treatment... Read More

Why Bluing ? Bluing serves 2 puposes. Rust protection: Bluing passivates the steel and renders some amount of rust protection to the steel. How does it passivate the steel? By slectively forming Fe3O4 instead of Fe2O3. Fe2O3 is what we call as ‘Rust’. Fe2O3, easily flakes off... Read More

Quick HT Quiz #12 Which of the stages of quenching process are exhibited by during marquenching using a nitrate – nitrite type salt bath? Options: a) Vapour Blanket phase and Boiling Phase b) Boiling Phase and Convection Phase c) Only Convection phase d) Vapour blanket phase,... Read More

Martempering or Marquenching is an interrupted quenching process employed to minimise the risk of cracking and distrotion of the quenched parts. The term Martempering is actually a misnomer and Marquenching is a better term. Let us see how Marquenching helps to reduce the risk of distortion... Read More