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Question 1
In the binary Iron-Carbon (Fe-Fe3C) equilibrium phase diagram, what is the microstructural product formed by the isothermal eutectoid decomposition of austenite (0.76 wt% C) at 727 °C?
Correct Answer:
Pearlite (lamellar mixture of ferrite and cementite)
Question 2
On a Time-Temperature-Transformation (TTT) diagram for a plain carbon steel, what physical phenomenon occurs at the 'nose' of the C-curve?
Correct Answer:
The overall transformation rate reaches its maximum due to the balance between thermodynamic driving force and atomic mobility.
Question 3
A structural steel component is quenched in oil to achieve full martensite and then tempered at 550 °C. What primary microstructural change occurs during this high-temperature tempering stage?
Correct Answer:
Supersaturated body-centered tetragonal (BCT) martensite decomposes into fine transition carbides and tempered martensite (ferrite matrix with dispersed Fe3C particles), restoring toughness.
Question 4
High-carbon alloy tool steels often contain significant amounts of retained austenite after quenching to room temperature. What heat treatment or thermal process is performed immediately after quenching to convert retained austenite into martensite?
Correct Answer:
Sub-zero cryo-treatment (cooling to -78 °C or -196 °C)
Question 5
A structural carbon steel exhibits a friction stress σ0 of 70 MPa and a Hall-Petch strengthening coefficient ky of 0.74 MPa·m^(1/2). If thermomechanical processing reduces the average grain diameter d from 64 μm to 16 μm, what is the new yield strength σy?
Correct Answer:
255.0 MPa
Question 1
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Prepare with the HKIE Professional Assessment - Materials Discipline Practice Questions - HKIE Professional Assessment - Materials Discipline (Hong Kong Institution of Engineers) Exam practice quiz. This question bank includes 100 questions covering steel, concrete, corrosion, structural, and stress. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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HKIE Professional Assessment - Materials Discipline Practice Questions - HKIE Professional Assessment - Materials Discipline (Hong Kong Institution of Engineers) Exam

This practice set contains 100 questions from the matching question bank and focuses on steel, concrete, corrosion, structural, and stress. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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