��1. National Center for Quality Supervision and Test of Steel Material Products�� Ma��anshan 243000�� China 2. Technology Center Ma��anshan Iron and Steel Co.�� Ltd.�� Ma��anshan 243000�� China��
Abstract��The early failure fracture of 8Cr5MoV cold roll occurred in use. The?fracture reasons were analyzed by means of the chemical composition analysis�� microstructure examination�� fracture analysis�� hardness?test and impact test. The?results?showed that the heat treatment for the roll body�� which did not conduct as required�� caused the fracture of the whole cross section of the roll body�� and the microstructure could not meet the requirement for the hardening layer with the tempering organization in the heart department and a certain thickness of needle martensite on the edge. In addition�� the net cementite level was too high in the area of the surface and the core of the roll�� and caused the deterioration of the toughness of the roll body�� which resulted in the early brittle fracture of cold roll.
�� �ɣ����˽������������� �䣬�� Խ. 8Cr5MoV������������ԭ�����[J]. �й������ڿ���, 2017, 35(4): 42-46.
HUANG Fei��ZHU Xing-jiang��ZHANG Xiao-li��WU Zhen��WANG Yue. Cause analysis of the fracture of 8Cr5MoV forged steel cold roll. Chinese Journal of Iron and Steel, 2017, 35(4): 42-46.
2017, Vol. 35 
