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TMT4240 Microstructure And Properties Of Metals

tag 0 Download 12 Pages / 2,904 Words tag 24-09-2020



  • Discuss the differences between Pearlite, Bainite and Martensite in carbon steels. Sketch the microstructures and discuss the properties of each phase (e.g. stiffness, strength, toughness, ductility) with reference to typical applications.
  • With the aid of a diagram, explain the micro-structure of Ferrite-Martensite Dual Phase (DP) steels and discuss the advantages of using DP steels incar manufacturing.


As an engineer working for a major car company you have been asked to investigate the possibility of manufacturing a composite bumper using a thermoplastic polymer and chopped carbon fibres. In you report

  • Describe the manufacturing
  • If the fibres are 10 µm in diameter, the tensile strength of the fibres is 3500 MPa and the fibre- matrix fibre strength is 100MPa, what is the criticallength?
  • A number of manufacturing production routes have been developed for producing CFRP components. One that has generated a great deal of interest is Automated Tape Laying. Withthe aid of diagram explain the operation of Automated Tape Laying
  • What are the advantages of Automated TapeLaying?


  • Outline the property requirements of hot roller tool steel for steel rolling operation and discuss the advantages of precipitation hardening intool 
  • Explain how precipitated particle (e.g. carbides) will enhance the strength of a material with reference to particledislocation 
  • B1 is a Ternary phase diagram of stainless steels. Sketch a simple diagram onto the answer sheet and illustrate how the point of the 18-8 stainless steel on the diagram isdetermined.

Fig. B1


  • With the aid of diagram, describe: (i) the molecule structure difference between thermoplastic and thermosets, and (ii) the deformation of a linear and cross linked polymer structure under tension load.
  • B2 is a diagram showing the structure of semi crystalline plastic. (i) Sketch a diagram on the answer sheet and label the region for crystal and amorphous structures. (ii) With the aid of a heat flow vs. temperature curve, describe the difference in thermal behaviour of crystalline structure and amorphous structure upon heating and, discuss at what temperature range, moulding process shouldbe performed.


Fig. B2

Discuss the main factors (at least 3) that affects the propertiesof


  • Outline the properties of Ceramics in comparison to metals and give THREE typical examples of ceramics and their applications, briefly discuss why the ceramic material is being
  • Describe the two following toughening mechanisms ofceramics
  • TransformationToughening
  • MicroCracking
  • Outline two typical applications of single crystal materials. In each case, briefly discuss why the single crystal isbeing


The aerospace industry is using Carbon Fibre Reinforced Plastics (CFRP) for an increasing number of its applications. The reason for this is that CFRP has the material properties that are of great interest to the aerospace sector, due to its high strength to weight ratio.

  • With the aid of diagrams explain the tensile stress-strain behaviour of CFRP component in a longitudinal loading and what useful behaviour does CFRP have with respect toits failure mode?
  • What will be the modulus of elasticity of a composite in the longitudinal direction, given the following:

Em: Moduli of Elasticity for the Matrix = 6.9 X 103 MPa Ef : Moduli of Elasticity for the fibres = 72.4 X 103 MPa Vm: Volume fraction of matrix = 40 %

  • With the aid of diagrams describe the 4 possible orientations of fibres in a CFRP
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