1. Match the phases of steel in Group I with the crystal structures in Group II.
Group I
Group II
P. Martensite
1. bcc
Q. Cementite
2. fcc
R. Austenite
3. bct
S. Ferrite
4. Orthorhombic
| Group I | Group II |
| P. Martensite | 1. bcc |
| Q. Cementite | 2. fcc |
| R. Austenite | 3. bct |
| S. Ferrite | 4. Orthorhombic |
2. When the radius of tiny particle is less than critical nucleous size then it is called
3. Movement of jogs can produce
4. Four eutectoid steel samples W, X, Y and Z are austenitized and then subjected to normalising, quenching, martempering and austempering treatments respectively. Which of the following statements is not correct?
5. Secondary hardening in steels arises out of the
6. Match the materials in Group 1 with the possible microstructure adjacent to the fusion line in the heat affected zone, in Group 2.
Group 1
Group 2
P. Pure aluminium
1. Martensite
Q. 0.6 mass% carbon steel
2. Grain boundary precipitation
R. Aged AI 4.5 mass% Cu alloy
3. Coarse precipitates
S. 18/8 stainless steel
4. Bainite
5. Coherent precipitates
6. Twins
7. Grain growth
| Group 1 | Group 2 |
| P. Pure aluminium | 1. Martensite |
| Q. 0.6 mass% carbon steel | 2. Grain boundary precipitation |
| R. Aged AI 4.5 mass% Cu alloy | 3. Coarse precipitates |
| S. 18/8 stainless steel | 4. Bainite |
| 5. Coherent precipitates | |
| 6. Twins | |
| 7. Grain growth |
7. Tetragonal crystal structure has
8. The percentage of pearlite in 0.8% carbon steel
9. Eutectic AI-Sialloys can be modified by small additions of
10. A peritectic reaction is
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