2024年6月6日 · Hypoeutectic and hypereutectic are two terms that describe the composition of alloys in relation to a special point on a phase diagram called the eutectic point. This point represents the specific composition and temperature at which a liquid alloy solidifies into a uniform mixture of two solid phases.

2024年11月26日 · Hypoeutectoid vs. Hypereutectoid Steel. Hypoeutectoid steel has less than 0.77% carbon, whereas hypereutectoid steel contains more than 0.77% carbon. The higher carbon content in hypereutectoid steels results in a microstructure primarily featuring cementite and …

Whereas hypereutectoid steels can obtain hardness and other mechanical properties through tempering that can make them desirable as bearing steels, hypoeutectoid steels generally do not possess enough carbon to achieve desirable hardenability.

2019年12月4日 · This video explains microstructural difference between hypoeutectoid and hypereutectoid.

A steel with carbon fraction less than C S = 0.76% is called a hypoeutectoid steel. It is located left of the eutectoid point in the diagram. Steels with a larger fraction of carbon are called hypereutectoid steels. The heat-affected zone (HAZ) is an important concept as it is the region in which the microstructure has changed (regions B–D).

2018年3月11日 · 🧠 The terms 'hypoeutectoid' and 'hypereutectoid' steels are introduced, based on their carbon content in relation to the eutectoid composition of 0.8% carbon. 🌡 The eutectoid steel, with 0.8% carbon, undergoes a phase change at 725 degrees Celsius, transforming from austenite (gamma phase) to a mixture of alpha (ferrite) and Fe3C (cementite).

The eutectoid point in the Fe - C system has a composition of around 0.76 %C, and steels with compositions less than this value are called hypo-eutectoid steels. Steels that are 100 % austenite must have temperature-composition coordinates within the area of …

The Fe-Fe 3 C diagram is analyzed in detail distinguishing between hypereutectoid and hypoeutectoid steels, as well as hypoeutectic and hypereutectic white castings. Different methods to estimate the strength of ferritic-pearlitic steels (including Pickering formula) are used.

2018年7月2日 · For hypoeutectoid steels with a carbon content of less than 0.8 %, ferrite is precipitated from the austenite lattice when the temperature falls below the γ-α-transformation line, as the face-centered cubic austenite begins to transform into the body-centered cubic ferrite.

Steel with a 0.78 wt% C is said to be a eutectoid steel. Steel with carbon content less than 0.78 wt% C is hypoeutectoid and greater than 0.78 wt% C is hypereutectoid. The region marked austenite is face-centered-cubic (FCC) and ferrite is body-centered-cubic (BCC). There are also regions that have two phases.