A suitable depth of the asphalt pavement using the AASHTO method.

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A steel, possessing an eutectoid composition, undergoes a gradual cooling process from 800°C to 600°C. Outline the transformation, equilibrium microstructure, and provide approximate component proportions. Describe the resultant non-equilibrium microstructure in two scenarios: a) the steel is rapidly cooled from 800°C to 600°C within 1 s, and then held at such temperature; b) the steel is rapidly cooled from 800°C to 600°C within 1 s, maintained at this temperature for 5 s, and subsequently quenched to room temperature. Use the provided diagrams. Temperature (°C) 1600 1538°C 1493°C 1400 L 1394°C Y+L 1200- 1147°C 2.14 Y. Austenite 4.30 1000 912°C Y+ FeC 800 a 600 400 0 (Fe) 0.76 0.022 a, Ferrite 2 a + Fe3C 3 Composition (wt% C) 727°C Cementite (Fe3C) 4 5 6 6.7

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Chapter 19, Problem 8P

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A suitable depth of the asphalt pavement using the AASHTO method.

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A steel, possessing an eutectoid composition, undergoes a gradual cooling process from 800°C to 600°C. Outline the transformation, equilibrium microstructure, and provide approximate component proportions. Describe the resultant non-equilibrium microstructure in two scenarios: a) the steel is rapidly cooled from 800°C to 600°C within 1 s, and then held at such temperature; b) the steel is rapidly cooled from 800°C to 600°C within 1 s, maintained at this temperature for 5 s, and subsequently quenched to room temperature. Use the provided diagrams. Temperature (°C) 1600 1538°C 1493°C 1400 L 1394°C Y+L 1200- 1147°C 2.14 Y. Austenite 4.30 1000 912°C Y+ FeC 800 a 600 400 0 (Fe) 0.76 0.022 a, Ferrite 2 a + Fe3C 3 Composition (wt% C) 727°C Cementite (Fe3C) 4 5 6 6.7

Please show the complete solution. The answers in this problem must be: 1. 16.25 kN 2. 51.725 kN 3. 45 000 mm² 4. 52.086 kN 5. 165.776 MPa 6. 62. 572 kN 7. 199. 173 MPa 8. 68.579 kN

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