The Brinell hardness number (HB=BHN) (measured per ASTM E10 "Standard Test Methods for Brinell Hardness of Metallic Mate

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The Brinell Hardness Number Hb Bhn Measured Per Astm E10 Standard Test Methods For Brinell Hardness Of Metallic Mate 1 (215 KiB) Viewed 22 times

The Brinell hardness number (HB=BHN) (measured per ASTM E10 "Standard Test Methods for Brinell Hardness of Metallic Materials”) is used in quality control of some 6061-T6 components to confirm the mechanical properties of a batch of material. Steel or P-3000 kg or 500 kg carbide tungsten D=10 mm ball Figure 1 Schematic of Brinell Hardness Test P is Yediff – 100 S.-33xBHN) a) Because aluminum is a lower-hardness material, a load of 500 kg is used which results in an impression, d, in the surface of 2.5 mm. The Brinell hardness for this material is: HB=BHN = р _kg/mm2 ADt (wD/2)(D-VDP-d) b) Empirical relations have been developed which relate ultimate tensile strength and BHN (kg/mm2) for non ferrous materials such that Surs = 3.3 BHN in MPa. For this case, Suts, as estimated from the BHN is _MPa. c) Compared to the Suts of 311+ 17 for 6061-T6 aluminum measured from a standard tensile test, the % difference between the tensile test measurement of Suts and the Brinell hardness estimated Suts From the hardness measurement, would you say S. that the material is 6061-T6 aluminum? Yes or No. Why or why not? d) There is some concern about the 2.5 mm impression left on the beam's surface by the Brinell hardness test. A Vicker's hardness (a.k.a. diamond pyramid hardness) test is known to leave a smaller indentation on the material surface. Determine the size of the impression, L, if a Vicker's diamond pyramid at P=10 kg is used. Recall that BHN VHN and that 2P HV = VHN - 2 sing where e = 136°, then L= mm. P=1-120 kg Diamond pyramid =136°=Included angle of faces d=L Figure 2 Schematic of Vickers Hardness Test e) Would the size of the Vicker's surface artifact (i.e., indentation) for quality control be more acceptable than the Brinell surface artifact in situations, such as cyclic fatigue? Yes or No. Explain [Note that the depth of the hemispherical indentation from the Brinell test is to (1 D BHN and for the inverted pyramidical indentation from the Vicker's test is t=117.] Р