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Eddy-current testing of laser hardened cement chromonickel steel for drilling bits
It is shown that the EC method can be used for detecting a wear-resistant layer formed at the surface of carburized chromonickel steel 20KhN3A as a result of laser hardening and subsequent treatment with cold and also for evaluating an abrupt reduction of the abrasive wear resistance observed after low-temperature tempering for steel strengthened with a laser and additionally treated with cold. When an attachable transducer with a protruding ferrite core characterized by an increased locality was applied, we revealed the high sensitivity of the EC method to structural changes occurring in laser-hardened carburized steel subjected to treatment with cold and tempering to temperatures of 250-300 deg C. For roller paths of drill-bit leg journals manufactured from steel 20KhN3A, it is established that the EC method can be used to control the quality of laser hardening increasing the resistance of carburized layers to contact-fatigue and abrasive wear. The attachable transducer with a protruding rod ferrite core allows detection of segments with the optimal and decreased (underheated) depths of the laser-hardened zone, with the laser-tempered zone (considerable underheating and the absence of hardening), and with the melted zone (overheating under laser processing) on curvilinear surfaces of roll and ball races. It is desirable to perform EC testing of strengthened parts of drill bits using an electromagnetic-field frequency at which the depth of the analyzed layer approximately corresponds to the optimal thickness of the laser-hardened layer.
Eddy-current testing of laser hardened cement chromonickel steel for drilling bits
It is shown that the EC method can be used for detecting a wear-resistant layer formed at the surface of carburized chromonickel steel 20KhN3A as a result of laser hardening and subsequent treatment with cold and also for evaluating an abrupt reduction of the abrasive wear resistance observed after low-temperature tempering for steel strengthened with a laser and additionally treated with cold. When an attachable transducer with a protruding ferrite core characterized by an increased locality was applied, we revealed the high sensitivity of the EC method to structural changes occurring in laser-hardened carburized steel subjected to treatment with cold and tempering to temperatures of 250-300 deg C. For roller paths of drill-bit leg journals manufactured from steel 20KhN3A, it is established that the EC method can be used to control the quality of laser hardening increasing the resistance of carburized layers to contact-fatigue and abrasive wear. The attachable transducer with a protruding rod ferrite core allows detection of segments with the optimal and decreased (underheated) depths of the laser-hardened zone, with the laser-tempered zone (considerable underheating and the absence of hardening), and with the melted zone (overheating under laser processing) on curvilinear surfaces of roll and ball races. It is desirable to perform EC testing of strengthened parts of drill bits using an electromagnetic-field frequency at which the depth of the analyzed layer approximately corresponds to the optimal thickness of the laser-hardened layer.
Eddy-current testing of laser hardened cement chromonickel steel for drilling bits
Wirbelstromprüfung von Laserstrahlgehärteten Chromnickelstahl Zement-Bohreinsätzen
Makarov, A.V. (author) / Gorkunov, E.S. (author) / Kogan, L.K. (author) / Korshunov, L.G. (author) / Malygina, I.Y. (author) / Osintseva, A.L. (author) / Kolobylin, Y.M. (author)
2010
11 Seiten, 6 Bilder, 1 Tabelle, 8 Quellen
(nicht paginiert)
Conference paper
Storage medium
English
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