通过磁学分析和磁记忆检测,研究了应力集中和去应力热处理对磁记忆检测结果的影响.结果表明:热处理前,应力集中和缺陷尺寸共同影响磁记忆信号的变化;缺陷引起磁记忆信号发生明显变化,并且磁记忆信号随着缺陷尺寸的增加表现出线性增加的规律.试样经过去应力热处理后,磁记忆信号明显削弱,难以反应出缺陷的位置.在外载荷作用下,磁记忆信号随着外加载荷的增加呈现出指数递增的变化规律.因此,应用磁记忆检测技术进行无损检测应充分考虑被测对象热处理状态和外加载荷的影响.并且,金属磁记忆检测结果可以用来验证去应力热处理的效果.
Effect of stress concentration and stress relief heat treatment(SRHT) on magnetic memory testing results of Q345R steel was studied by means of magnetic analysis and magnetic memory testing.The results show that before SRHT,the changes of magnetic memory signals are affected by the stress concentration and the size of the defect,and the defect effect is significantly,and it shows a linearly increases with increasing the size of the defect.However,after SRHT,the magnetic memory signal of the specimen becomes weaker and does not clearly reflect the position of the defect due to the relief of stress concentration in defect area.When the loads are applied to specimen,the magnetic memory signal of defective area shows an exponentially increasing relationship with increase of stress.Therefore,the SRHT and the applied loads can be considered in the application of magnetic memory testing technology.Also,metal magnetic memory test results can be used to verify the effect of SRHT.
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