表面爆炸处理后的ZGMn13Cr2钢的冲击磨损性能及硬化机理
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摘要
对ZGMn13Cr2钢表面进行一次爆炸处理,测量其冲击磨损性能,观察不同硬化层的显微组织,分析其硬化机理。实验结果表明:经爆炸处理后的ZGMn13Cr2钢硬度随硬化深度的增加而降低,耐磨性提高了1.32～1.41倍,磨损形貌以犁沟、剥落坑为主,还有少量破碎坑;通过对不同硬化深度的实验用钢表面进行显微表征,发现硬化层内产生了大量的形变孪晶,爆炸表面具有高密度位错的畴界,距爆炸表面10 mm处有泰勒晶格以及距爆炸表面20 mm处出现大量平行的滑移带和滑移带交割,未观察到马氏体组织,仍以基体奥氏体为主,这说明一次爆炸处理的ZGMn13Cr2钢的硬化机理为孪晶硬化和位错硬化的复合机制。
The surface of ZGMn13 Cr2 steel was subjected to an explosion treatment, its impact wear performance and microstructure with different har-dening depths were observed, and the hardening mechanism was analyzed. The results indicate that the hardness of ZGMn13 Cr2 steel after explosion treatment decreased with the increase of hardening depth, and the wear resistance is improved by 1.32—1.41 times. Its worn surfaces consist of peeling pits, grooves and a small amount of broken pits. A large number of the deformation twins(hardened layer), domain boundary with high density dislocations(explosion surface), Taylor lattice(10 mm from explosion surface) and parallel slip bands and the intersections of slip bands(20 mm from explosion surface) were observed in the test steel surface with different hardening depths, but there was no martensite, the austenite matrix was mainly observed. Therefore, hardening mechanism of ZGMn13 Cr2 steel is mainly dislocation hardening and twins hardening.
The surface of ZGMn13 Cr2 steel was subjected to an explosion treatment, its impact wear performance and microstructure with different har-dening depths were observed, and the hardening mechanism was analyzed. The results indicate that the hardness of ZGMn13 Cr2 steel after explosion treatment decreased with the increase of hardening depth, and the wear resistance is improved by 1.32—1.41 times. Its worn surfaces consist of peeling pits, grooves and a small amount of broken pits. A large number of the deformation twins(hardened layer), domain boundary with high density dislocations(explosion surface), Taylor lattice(10 mm from explosion surface) and parallel slip bands and the intersections of slip bands(20 mm from explosion surface) were observed in the test steel surface with different hardening depths, but there was no martensite, the austenite matrix was mainly observed. Therefore, hardening mechanism of ZGMn13 Cr2 steel is mainly dislocation hardening and twins hardening.
引文
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12 Li M S,Zhao S D,Shi G S.Acta Metallurgica Sinica,1990,26(6),90(in Chinese).李明山,赵士达,史国顺.金属学报,1990,26(6),90.
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24 Bay B,Hansen N,Khulmann-Wilsdorf D.Materials Science and Engineering A,1989,113,385.