热处理对提高疲劳强度与修复疲劳裂纹的影响  

Effects of Heat Treatment on Improving Fatigue Strength and Repairing Fatigue Crack

作　　者：付杰[1] 董炎锋 付广柱 

机构地区：[1]中国矿业大学机电工程学院,江苏徐州221000

出　　处：《热处理技术与装备》2014年第6期40-43,共4页Heat Treatment Technology and Equipment

摘　　要：零件在使用过程中受到交变动载荷作用时,容易产生疲劳,严重的时候导致零件的破坏,甚至造成事故。热处理能够有效地提高材料的疲劳强度,并且能够对零件疲劳裂纹进行修复,从而延长零件使用寿命。疲劳裂纹容易产生于应力集中的部位,优化的组织结构能够有效抑制初始疲劳裂纹产生;热处理工艺选取是否合理对于保证材料疲劳强度是关键,热处理过程中应防止脱碳,获得晶粒大小合适,协调性好的组织;处于不同时期的裂纹其修复使用的热处理方法不同;由于组织与基体组织之间存在差异使得裂纹修复只能进行有限次数。Fatigue crack appears easily when the part suffers ous accident to lead the part destroyed. Heat treatment is an alternating dynamic load. It will cause serieffective way to improve fatigue strength and repair fatigue crack, so as to prolong the service life of part. Crack appears easily at the place of stress concentration, so optimized structure can effectively restrain the initial crack. Proper neat treatment process is the key to guarantee the material fatigue strength. In order to get proper fatigue strength, it must prevent decarburization and get appropriate grain size and good coordination structure. Different heat treatment methods are used in different periods of crack. Crack repairing is limited at finite times because of the difference between matrix and repairing structures.

关 键 词：热处理 疲劳强度 疲劳裂纹 裂纹修复 

分 类 号：TG156[金属学及工艺—热处理]