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本文报导了作者对铬镍奥氏体不锈钢焊缝中铁素体含量的磁法测定的研究结果,包括在饱和磁场中的冲击测量法,在不饱和交变磁场中的测量方法以及有关选择标准试样的一些问题的讨论。详细介绍了冲击测量法的基本原理、所用装置及测量方法。焊制、并用此法测定了一批铬镍不锈钢焊缝的铁素体标准试样。试制了具有不饱和交变磁场的便携式铁素体测定仪,与不锈钢标准试样相配合,可以迅速简便地测出试样中的铁素体含量。根据理论分析及实际试验结果,论证了国内外所沿用的以纯铁和铁粉代替不锈钢作为标准试样的方法是不正确的。
This paper reports the results of the magnetic measurements of ferrite content in austenitic stainless steels, including impact measurements in a saturated magnetic field, measurements in an unsaturated alternating magnetic field, and studies on selection criteria Kind of discussion of some issues. The basic principle of impact measurement method, the device used and the measurement method are introduced in detail. Welding, and use this method for the determination of a number of chrome-nickel stainless steel weld ferrite standard sample. A prototype of a portable ferrite tester with an unsaturated alternating magnetic field has been developed to match the stainless steel standard specimen to quickly and easily determine the ferrite content in the specimen. According to the theoretical analysis and the actual test results, it is proved that the method of using pure iron and iron powder instead of stainless steel as the standard sample is not correct at home and abroad.