中空钢疲劳寿命的研究现状及展望

中空钢是制造凿岩钎杆的专用钢铁材料,也是钎钢工业的代表性产品。世界上优质钎杆所采用的中空钢,均具有较高疲劳寿命且质量稳定,是高技术含量和高附加值的精品钢铁材料。与进口高端中空钢相比,同类型的国产中空钢的疲劳寿命仍有较大提升空间。中国是钎钢工业大国,为实现高质量发展,应借鉴钢铁工业的新技术、新工艺,探索提高中空钢疲劳寿命的新方法,打造高疲劳寿命且质量稳定的精品中空钢。针对中空钢失效形式及影响其疲劳寿命的主要因素,对提升和预估其疲劳寿命的现有研究成果进行了综述。未来应采用电磁搅拌、脉冲电流作用等先进技术提升中空钢质量,并探索疲劳寿命智能化预测技术与裂纹修复技术相结合的应用条件。

Research status and prospect of fatigue life of hollow drill steel

Hollow drill steel is a special steel material for manufacturing rock drill rod and also a representative product of rock drill steel industry. All the hollow drill steel used in the high quality rock drill tools around the world has high fatigue life and stable quality,which is fine steel with high technology and high value-added. Compared with imported high-end hollow drill steel,the fatigue life of domestic hollow steel of the same type still has a large room for improvement. China is a major producer and user in the rock drill steel and tools industry,in order to achieve high-quality development,the new technology and process of steel industry will be used for reference,and the new method to improve the fatigue life of hollow drill steel will be explored to produce high-quality hollow drill steel with high fatigue life and stable quality. In view of the failure form of hollow drill steel and the main factors that affect its fatigue life,the present research results of improving and estimating its fatigue life are reviewed. In the future,the advanced technology such as electromagnetic stirring,electropulsing treatment will be used to further improve the quality of hollow drill steel,the application conditions of the combination of the intelligent prediction and management system of fatigue life and the technology of crack repairing will be developed.