Answer : Option:- A
Solidification in a phase diagram starts at the liquidus line. The liquidus indicates the temperature above which the material is entirely liquid, and as it cools, it begins to solidify at this line.
Answer : Option:- C
Flow lines are typically observed in forging processes. These lines indicate the movement of material during deformation, and they help in understanding how the material is being shaped and the direction of forces applied during the process.
Answer : Option:- C
The highest magnification achievable on a typical optical microscope is around 1500X. Beyond this, the resolution is limited by the wavelength of light, making it difficult to observe finer details at higher magnifications.
Answer : Option:- A
An isomorphous alloy is the odd one out. Unlike terminal solid solutions, intermediate solid solutions, and compounds, which involve specific interactions between components, isomorphous alloys are characterized by a single-phase structure throughout the composition range, without forming separate phases.
Answer : Option:- A
A phase diagram does not provide information about transformation rates. It shows the equilibrium phases present at different temperatures and compositions, but it does not indicate the speed at which phase transitions occur. The diagram helps predict the phase at a given condition, but not how fast these phases form.
Answer : Option:- A
Martensite obtained with less than 0.6% carbon forms in a lath structure. This structure is more fine-grained compared to the plate structure, which typically forms at higher carbon concentrations. The lath martensite is characteristic of steels with low carbon content.
Answer : Option:- A
Nitrogen is an austenite stabilizer. It helps stabilize the austenite phase in steels, especially at lower temperatures, by increasing the solubility of carbon in the iron, preventing the transformation to ferrite.
Answer : Option:- C
Homogeneous nucleation is a process where a new phase (like a solid) forms spontaneously within a homogeneous phase (like a liquid or gas). It is a necessary step for crystal growth, but it requires specific conditions to proceed.
Answer : Option:- C
A eutectoid reaction occurs when one solid phase transforms into two different solid phases upon cooling. This reaction is important in the transformation of austenite to pearlite in steel.
Answer : Option:- A
A peritectic reaction occurs when a solid and liquid phase react to form a different solid phase upon cooling. This reaction is critical in the phase diagram of alloys, such as in steel or some cast metals.