Abstract
The micro-structure of the"hardspots by segregation"was reported in the previous paper. This is to report on the study regarding the measurement of hardness and analysis of chemical element of this kind of hardspot.
(1) The hardness of the hardspot is not so high. It is in the range of 110HV to 200HV in microvickers hardness.This hardness is classified into five groups: 110HV-130HV, 130HV-150HV, 140HV-160HV, 150HV-170HV and 170HV-200HV.
(2) The hardness of the hardspot is 1.14 to 1.67 times of that of matrix.
(3) More chemical element are contained in the hardspot than in matrix. The content of Cu is 3.7-6.5% and that of Si is 8.5-12.3%
(4) In comparison with matrix, 1.23-1.86 times of Cu, 1.10-1.46 times of Si, 0.86-1.60 times of Fe, 1.43 times of Mg and 1.09-1.27 times of Zn are contained in the hardspot.
