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X120Mn12高锰钢在等温退火和再奥氏体化过程中微观结构变化及耐磨性能的研究

Investigation into Changes of Microstructure and Abrasive Wear Resistance Occurring in High Manganese Steel X120Mn12 during Isothermal Annealing and Re-Austenitisation Process.

作者信息

Dziubek Mateusz, Rutkowska-Gorczyca Małgorzata, Dudziński Włodzimierz, Grygier Dominika

机构信息

Faculty of Mechanical Engineering, Wroclaw University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wroclaw, Poland.

Faculty of Technical and Economic Sciences, Witelon Collegium State University, Sejmowa 5A, 59-220 Legnica, Poland.

出版信息

Materials (Basel). 2022 Apr 2;15(7):2622. doi: 10.3390/ma15072622.

DOI:10.3390/ma15072622
PMID:35407952
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9000706/
Abstract

Hadfield steel, under unit pressure conditions, strengthens itself by forming a high density dislocation structure, which results in increased resistance to dynamic impact wear. However, under abrasion conditions, the homogeneous microstructure of the cast steel is insufficient to achieve the expected service life. The aim of the research is to conduct a comparative analysis of the material in its as-delivered state and after two-stage heat treatment (isothermal annealing followed by re-austenitisation). It was found that after isothermal annealing of X120Mn12 grade steel at a temperature of 510 °C, a microstructure with a complex morphology consisting of colonies of fine-grained pearlite, (Fe,Mn)C carbides distributed along the grain boundaries of the former austenite and needle-like (Fe,Mn)C carbides was obtained in the austenite matrix. The subsequent thermal treatment of the steel with the use of supersaturating annealing at 900 °C resulted in a heterogeneous microstructure consisting of evenly distributed globular carbide precipitations in a matrix of considerably finer austenite grains in comparison with the as-delivered original state. As a result of the final microstructural changes achieved, a 16.4% increase in abrasion resistance was obtained compared to the delivered condition.

摘要

哈德菲尔德钢在单位压力条件下，通过形成高密度位错结构来强化自身，这导致其抗动态冲击磨损能力增强。然而，在磨损条件下，铸钢的均匀微观结构不足以达到预期的使用寿命。该研究的目的是对材料的交货状态和经过两阶段热处理（等温退火后再奥氏体化）后的状态进行对比分析。研究发现，在510℃对X120Mn12钢进行等温退火后，在奥氏体基体中获得了一种形态复杂的微观结构，该结构由细晶粒珠光体团、沿原奥氏体晶界分布的(Fe,Mn)C碳化物以及针状(Fe,Mn)C碳化物组成。随后在900℃进行过饱和退火对该钢进行热处理，得到了一种不均匀的微观结构，与交货时的原始状态相比，在明显更细的奥氏体晶粒基体中均匀分布着球状碳化物析出物。由于最终实现的微观结构变化，与交货状态相比，耐磨性提高了16.4%。

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