Blanking failure analysis of 25CrMnB track steel

doi:10.13251/j.issn.0254-6051.2021.12.047

Abstract

Abstract: Distribution law of microstructure and hardness of different parts in the 25CrMnB track steel was studied by means of metallographic and hardness tests, and the cause of blanking fracture of hot-rolled 25CrMnB track steel was analyzed. The results show that the hardness of the water-cooled specimen is higher than that of the air-cooled specimen, and the hardness of the inducing tooth parts of the track steel where the failure occurs firstly is more likely to be abnormally high. The reason of blanking fracture of the track steel is the appearance of mixed grain structure, reticular ferrite and granular bainite. High stress concentration could occur at the abnormal microstructure when the material is stressed, which leads to the initiation and propagation of microcracks and the blanking failure of track steel. The reason for the appearance of mixed grain structure and reticular ferrite is too high final rolling temperature. On the basis of EDS analysis, the main reason for the appearance of granular bainite is the segregation of microscopic elements of Mn and B.

Key words: 25CrMnB track steel, abnormal microstructure, granular bainite, hardness distribution

CLC Number:

TG142.1

Tian Yu, Yu Hao. Blanking failure analysis of 25CrMnB track steel[J]. Heat Treatment of Metals, 2021, 46(12): 282-288.

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