Xin Guo , Yi Liu , Hua Zhao , Jiangfeng Song , Jinge Liao , Xiaohui Feng , Bin Jiang , Yuansheng Yang
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引用次数: 0
Abstract
In this paper, the influence of pulsed magnetic fields (PMF) with different voltages (0 V, 50 V, 100 V, and 150 V) on the hot tearing susceptibility (HTS) of Mg-1Ca alloy was investigated, hot tearing experiments were carried out with a constraint rod casting (CRC) mold, and COMSOL simulations of the solidification process were performed. The experimental results showed that the HTS of the alloy decreased with increasing PMF voltage, and the alloy exhibited the lowest HTS at a PMF voltage of 150 V. The area of hot tears in hot spots was reduced from a complete fracture (∞) to 0.21 mm2, and the cracking susceptibility coefficient (CSCt) value decreased from 1.83 to 1.58. The application of PMF accelerates the passage through the susceptibility temperature range of hot tearing. Combined with the simulation results, it is shown that with the increase of PMF intensity, the forced convection of induced melt is enhanced, which leads to the breakage or separation of primary brittle dendrites and makes the grains more refined. It not only increases the tensile stress required for liquid film separation but also reduces the shrinkage strain acting on the grain boundary per unit. In addition, the electromagnetic force forcibly drives the melt to flow, which increases the flow velocity of the melt, thus enhancing the feeding ability of the alloy. Finally, the HTS of Mg-1Ca alloy was obviously optimized.
期刊介绍：
Engineering Failure Analysis publishes research papers describing the analysis of engineering failures and related studies.
Papers relating to the structure, properties and behaviour of engineering materials are encouraged, particularly those which also involve the detailed application of materials parameters to problems in engineering structures, components and design. In addition to the area of materials engineering, the interacting fields of mechanical, manufacturing, aeronautical, civil, chemical, corrosion and design engineering are considered relevant. Activity should be directed at analysing engineering failures and carrying out research to help reduce the incidences of failures and to extend the operating horizons of engineering materials.
Emphasis is placed on the mechanical properties of materials and their behaviour when influenced by structure, process and environment. Metallic, polymeric, ceramic and natural materials are all included and the application of these materials to real engineering situations should be emphasised. The use of a case-study based approach is also encouraged.
Engineering Failure Analysis provides essential reference material and critical feedback into the design process thereby contributing to the prevention of engineering failures in the future. All submissions will be subject to peer review from leading experts in the field.
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