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What is a component in a phase diagram?

Overview. Common components of a phase diagram are lines of equilibrium or phase boundaries, which refer to lines that mark conditions under which multiple phases can coexist at equilibrium. Phase transitions occur along lines of equilibrium.

What is the difference between martensite and austenite?

Martensite is a body centred cubic form of crystallised iron which is created when heated austenite is rapidly cooled by quenching. Martensitic stainless steels can be heat treated and hardened, but have reduced chemical resistance when compared to austenitic stainless steels

What is the austenite phase?

Austenite, also known as gamma-phase iron (γ-Fe), is a metallic, non-magnetic allotrope of iron or a solid solution of iron, with an alloying element. In plain-carbon steel, austenite exists above the critical eutectoid temperature of 1000 K (727 °C); other alloys of steel have different eutectoid temperatures.

What is the difference between austenite and ferrite?

Ferrite is soft and ductile, while pearlite is hard and brittle. Austenite is a high-temperature phase of plain steel, which recrystallizes into ferrite/pearlite around 1425°F (depending on chemistry), below which ferrite becomes the more stable phase.

What is the meaning of austenite?

: a solid solution in iron of carbon and sometimes other solutes that occurs as a constituent of steel under certain conditions.

What is austenite used for?

Austenitic stainless steels are used for domestic, industrial, transport, and architectural products based primarily on their corrosion resistance but also for their formability, their strength, and their properties at extreme temperatures.

What does ferritic mean?

Ferritic is typically metallic materials, that contain some portion of iron in its chemical composition. Ferritic can refer to substances in a solution, in a solid or liquid state

Is nickel an austenite stabilizer?

First of all, nickel, manganese and nitrogen are austenite stabilizers while chromium and molybdenum stabilize the ferritic phase

Which one of the following elements is an austenite stabilizer?

Correct answer is option A. Austenite stabilisers lower the eutectoid temperature, thereby expanding the austenite phase field (i.e., temperature range over which austenite is stable). Examples of austenite stabilisers are C, Ni, Mn, N, Cu, Co, Zn, Au.

Which of the following element is an austenite stabilizer?


What influence does the presence of alloying elements?

The presence of alloying elements (other than carbon) does not influence on the shape of a hardenability curve. It causes a much more rapid decrease in hardness with position from the quenched end.

Which one of the following elements is a ferritic stabilizer?

The following elements have ferrite stabilizing effect: chromium (Cr), tungsten (W), Molybdenum (Mo), vanadium (V), aluminum (Al) and silicon (Si). Examples of ferritic steels:transformer sheets steel (3%Si), F-Cr alloys. Carbide forming – elements forming hard carbides in steels

Why is nickel austenite stabilizer?

Ni produces a significant increase in toughness, even in the low temperature range, and is, therefore, alloyed for increasing toughness in case-hardening, heat-treatable and low temperature toughness steels. Ni depresses the Ac and Ar critical points. It lowers the carbon content of the eutectoid.