Abstract
As an important type of wearresistant material, the lowalloyed medium carbon wear resistant steel has been widely used in mining, power and metallurgical industries due to its low cost and excellent mechanical properties. However, the coarse as-cast microstructure tends to form in large wear resistant castings because of the long solidification time. As a result, spalling wear resulting from the preferential initiation and propagation of cracks along interdendrite will occur during service process, which severely degrades the wear resistance and service life. In this work, Ti is added to improve the mechanical properties of medium carbon Cr-Mo wear resistant steel. The precipitation behavior of TiN in the solidification process and its effect on the solidification microstructure were investigated by thermodynamic calculation, constant temperature solidification experiment at solid-liquid *国家自然科学基金资助项目 51301175 收到初稿日期: 2015-10-15,收到修改稿日期: 2015-12-09 作者简介:郭文营,男, 1984年生,博士生 DOI: 10.11900/0412.1961.2015.00532 第769-777页 pp.769-777
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