钢中微米夹杂物分布特征及其对力学性能的影响研究

doi:10.3976/j.issn.1002-4026.2025007

Abstract

Abstract: Under the current technological conditions, inclusions have become inevitable in steel. To investigate the impact of micron-sized inclusions on the mechanical properties of metals, vacuum arc melting was used to control the mass fractions (contents) of micron Al?O? powder at 0%, 0.2%, 0.6%, 1%, and 2%, thereby preparing samples with different contents of micron-sized inclusions. Statistical analysis of inclusion sizes via computed tomography and scanning electron microscopy (SEM) revealed that most inclusions had a size of <5 μm. Moreover, the quantity of inclusions proportionally increased with increasing Al?O? content. Mechanical properties were tested using the indentation method; the test results indicated that the addition of a certain amount of micron-sized inclusions can enhance the mechanical performance of a metal. However, when the Al?O? content exceeded 1%, the tensile strength increase slowed down and the yield strength decreased. SEM observations revealed that at high Al?O? content, inclusions tended to agglomerate into large inclusions or clusters, which caused local stress concentration. This phenomenon in turn negatively affected the strengthening effect of the micron-sized inclusions on the mechanical properties of the investigated metal.

Key words: micron-sized inclusions, inclusion statistics, scanning electron microscopy, indentation method, mechanical properties

CLC Number:

TB302

WANG Zhengci, LIU Long, TIAN Linan, LIU Zhe, SUN Wei, LIU Yongchao, WEN Peijian, ZHANG Qing. Distribution of micron inclusions in steel and their impact on its mechanical properties[J].Shandong Science, 0, (): 1-.

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Distribution of micron inclusions in steel and their impact on its mechanical properties

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