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22.33 In Table 22.1, the last tw o properties listed can be

22.33 In Table 22.1, the last tw o properties listed can be

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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22.33 In Table 22.1, the last tw o properties listed can be
im portant to the life of a cutting tool. Why?

TABLE 22.1 General Characteristics of Tool Materials Carbides Cubic boron nitride Single-crystal diamond" Cast-cobalt High-speed steels Property alloys WC TIC Ceramics 4000-5000 HK 7000-8000 HK 91-93 HRA 1800-3200 HK 91-95 HRA 2000-3000 HK 83-86 HRA 82-84 HRA 46-62 HRC 90-95 HRA 1800-2400 HK Hardness Compressive strength, MPa 4100-4500 1500-2300 4100-5850 3100-3850 2750-4500 6900 6900 Transverse rupture strength, MPa Impact strength, 2400-4800 1380-2050 1050-2600 1380-1900 345-950 700 1350 1.35-8 0.34-1.25 0.34-1.35 0.79-1.24 <0.1 <0.5 <0.2 Modulus of elasticity, GPa 200 520-690 310-450 310-410 850 820-1050 Density, kg/m3 Volume of hard phase, % Melting or decomposition temperature, °C Thermal conductivity, W/m-K Cocfficient of thermal expansion, x 10-6 °C 8600 8000-8700 10,000-15,000 5500-5800 4000-4500 3500 3500 7-15 10-20 70-90 100 95 95 1300 1400 1400 2000 1300 700 30-50 42-125 17 29 13 500-2000 12 4-6.5 7.5-9 6-8.5 4.8 1.5-4.8 *The values for polycrystalline diamond are generally lower, except for impact strength, which is higher.
Transcribed Image Text:TABLE 22.1 General Characteristics of Tool Materials Carbides Cubic boron nitride Single-crystal diamond" Cast-cobalt High-speed steels Property alloys WC TIC Ceramics 4000-5000 HK 7000-8000 HK 91-93 HRA 1800-3200 HK 91-95 HRA 2000-3000 HK 83-86 HRA 82-84 HRA 46-62 HRC 90-95 HRA 1800-2400 HK Hardness Compressive strength, MPa 4100-4500 1500-2300 4100-5850 3100-3850 2750-4500 6900 6900 Transverse rupture strength, MPa Impact strength, 2400-4800 1380-2050 1050-2600 1380-1900 345-950 700 1350 1.35-8 0.34-1.25 0.34-1.35 0.79-1.24 <0.1 <0.5 <0.2 Modulus of elasticity, GPa 200 520-690 310-450 310-410 850 820-1050 Density, kg/m3 Volume of hard phase, % Melting or decomposition temperature, °C Thermal conductivity, W/m-K Cocfficient of thermal expansion, x 10-6 °C 8600 8000-8700 10,000-15,000 5500-5800 4000-4500 3500 3500 7-15 10-20 70-90 100 95 95 1300 1400 1400 2000 1300 700 30-50 42-125 17 29 13 500-2000 12 4-6.5 7.5-9 6-8.5 4.8 1.5-4.8 *The values for polycrystalline diamond are generally lower, except for impact strength, which is higher.
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