Assessing the Hardness of Quenched Medium Steel Using an Ultrasonic Nondestructive Method

Table 1

Hardness along the circle of 1/2 radius and center of the samples with different temperatures.

Temperature (°C)	760		800		840		880		920
	Average	Center	Average	Center	Average	Center	Average	Center	Average	Center
Hardness (HRC)	20.08	19.77	24.36	23.33	32.78	29.00	42.44	41.60	44.29	43.37
Difference (%)	1.54		4.22		11.52		1.97		2.08