The production of superalloys that are used in the present time is a story of the invention of advanced melting technology. Either the final product is forged or cast, the basis of superalloy’s ability is to produce the characteristics based on the suitable option and adaption of melting techniques.  Superalloy melting practices are categorized as … Continue reading Melting procedures for production of superalloys

While in the beginning of 20th century, chromium was included into cobalt, nickel and iron based alloys. The received products were significantly resistant to atmospheric conditions and to oxidation at the elevated temperatures. During World war 2, some of these alloys now comprising of more alloying agents had been used as resistance wires, dental prostheses, cutlery,furnace and … Continue reading Evolution of Superalloys during second world war

The superalloys are ductile in nature however cobalt based superalloys have lower ductility as compare to iron-nickel and nickel based superalloys. The short period tensile ductility varies from 10% to maximum 70% but gamma’ hardened alloys have low ductility up to 40%.  The Superalloys generally have dynamic moduli of elasticity in the limit of 207 GPa … Continue reading Mechanical Behavior of Superalloys

Superalloys are those nickel, iron and cobalt based corrosion and heat resistant alloys that are normally employed above temperature 540oC or1000oF. Iron based nickel superalloys are an extension of stainless steel technology and normally are melted and cast to electrode and ingot shapes for final fabrication to parts. The Nickel-iron based superalloys are wrought formed to … Continue reading Oxidation and Mechanical Behavior of Super alloys

Metals are crystalline in nature and in their solid form, the atoms of alloys or metals exhibit different crystallographic structures, usually cubic structures. Some crystal structures are linked with enhanced properties as compare to others. Moreover, crystalline group of atoms maintain orientation relationships. Consistent crystalline clusters are known as grains, and in an alloy, there … Continue reading Strengthening of Superalloys

Generally the FeCrAl heating Alloys have similar basic chemical composition of 20-25% chromium, 4.5 to 6% aluminum and remaining iron. Other elements are Yttrium and silicon. Properties of FeCrAl The FeCrAl alloys can be processed at temperatures up to 1250oC offering resistance temperature about 1300oC. They possess ferrite structure. Subsequent to fine processing of alloy at … Continue reading FeCrAl heating Alloy- Behavior in different atmospheres

In the Nichrome matrix chromium can be completely dissolved in nickel. The dissolution is highest at 47% in the eutectic temperature and reduces at concentration of 30% at room temperature. Various nickel-chrome alloys are based on this solution that offers superior resistance to elevated temperature oxidation and diverse corrosive media as well as excellent wear resistance. Oxidation … Continue reading Nickel-Chrome resistance alloys- High temperature Corrosion resistance

Sea Water operations need construction material to avoid corrosion due to hard conditions but it should be economical to buy. The alloys that have 6% molybdenum and super austenitic stainless steel are affordable but these couldn’t work in many of the corrosive conditions. Therefore, a Duplex stainless steel 2205 with excellent corrosion resistance as of UNS … Continue reading Duplex stainless steel 2205- Local corrosion resistance

FeCrAl alloy is used as catalytic substrate that is a metallic substrate offering various benefits as compare to ceramic substrates. A metallic substrate offers more resistance to shock and vibration, it offers higher conductance to heat rather than ceramic. Moreover,it can be manufactured easily in thin foil and offers honeycomb structure to render broad surface area … Continue reading FeCrAl Resistance Heating Alloy-Scaling Resistance

A fixed position electric heater produces heat through the passage of current to the heating element that is made of a Nichrome resistance heating wire Ni80Cr20. The Nichrome heating element can be covered in a metal sheath shielded with a magnesium oxide powder or can be kept in open coil geometry.Generally, the heating element is … Continue reading Nichrome in Fixed position electric heaters