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本文通过对水泥磨一仓筒体Mn 13钢衬板残体磨损表面进行宏观硬度测定与扫描电镜观察,分析了衬板的磨损方式及变形失效机理。用正交设计回归分析,研究了合金元素对屈服强度的影响及变质处理对晶粒度、夹杂物类型、形态、大小与分布的影响,并对研究用钢衬板进行了现场运行试验。结果表明:Mn 13钢制造的水泥磨一仓衬板的磨损方式为中、小应力的凿削碾研磨损,变形失效主要是由于大部分冲击功转变为塑性形变能与Mn 13钢屈服强度低所致。回归方程得出奥氏体巾锰钢的屈服强度随着C,Cr 含量的增加和晶粒细化而提高,与Mn 13钢相比可增加150牛/毫米~2以上,C 的效果最显著。Nb、N、Ti 孕育处理的奥氏体中锰钢的奥氏体晶粒度比Mn 13钢的细化3～4级。RE 则有利于保持钢的较高冲击韧性。运行试验表明,RE、Ti 变质处理的140Mn7Cr2 与120Mn7Cr2钢制造的衬板的抗变形能力明显优于Mn 13钢。
In this paper, the hardness of the worn surface of the cement mill Mn 13 steel liner was measured by macroscopical hardness and scanning electron microscopy, and the wear mechanism and deformation failure mechanism of the liner were analyzed. The effects of alloying elements on the yield strength and the effects of modification treatment on the grain size, inclusions, shape, size and distribution were studied by orthogonal design regression analysis. The field test was carried out on the research steel linings. The results show that the abrasion mode of cement mill liner made by Mn 13 steel is medium and small stress chiseling and milling wear. The deformation failure is mainly due to the fact that most of the impact energy is transformed into plastic deformation energy and the yield strength of Mn 13 steel is low Due. The regression equation shows that the yield strength of austenitic manganese steel increased with the increase of C and Cr content and grain refinement, increased by more than 150 N / mm 2 compared with Mn 13 steel, the effect of C was the most significant . The austenite manganese steel austenite grain size of Nb, N, Ti inoculation than the Mn 13 steel refining grade 3-4. RE is conducive to maintaining the higher impact toughness of steel. The operation tests show that the anti-deformability of liner made of 140Mn7Cr2 and 120Mn7Cr2 steel with RE and Ti modification is obviously better than Mn 13 steel.