How to carry out the failure analysis of roll?
The roll failure analysis, find the main reason of roller damage, is the common concern of cold rolling mill rollfactory and topic. Spalling, fracture, after surface crack problems, users should pay attention to;
(1) fracture protect roll
(2) collect flaking block
(3) collect and protect roll records for the roll, eddy current inspection records and other related materials
Through macroscopic judgment on spalling fracture, professionals can estimate the crack generation andpropagation region, instantaneous fracture region. Generation of crack should be given attention, at the same time can roll change record comparison, look in the recent change whether roll record abnormal roll changing,whether there is abnormal damage of roll surface the primary reason, cause spalling.
If a single judgment could not determine the reasons of crack forming, can generate regional sampling analysis in the crack, the microstructure analysis includes the analysis of the project, acid corrosion test, chemical composition analysis, the original organization judge roll is normal, the carbide distribution is reasonable, whether the abnormal roll surface by mechanical and thermal injury this work can be fabricated and common usage from roll, also can have the third party were analyzed.
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