Micro Behavior Study of Non-Metallic Inclusion in High Strength Shaft Steel

Abstract:

The composition, shape, size and distribution of non-metallic inclusions in a kind of high strength shaft steel enriched CoNi have been investigated. In situ tensile tests in special designed SEM have been conducted to trace the whole process of crack initiation and propagation till to fracture at inclusion. The experimental results show that the non-metallic inclusions in the high strength shaft steel are primarily AlN. Their average size is about 3.6µm. Sometimes, a string of inclusions distributes along the rolling direction. Non-metallic inclusion can induce crack to be initiated by inclusion debonding. When the inclusion size is larger than the critical size, the crack can propagate as the main crack that induces the specimen to fracture.

• Periodical: Key Engineering Materials (Volumes 297-300)
• Pages: 1229-1234
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.297-300.1229
• Online since: November 2005
• Authors: Yan Ping Zeng, Chun Mei Xu, Jian Xin Dong, Mai Cang Zhang, Xi Shan Xie
• Keywords: Crack Initiation, Crack Propagation, Fracture, High Strength Shaft Steel, Inclusion

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