Improvement of mechanical properties and wear resistance of direct‐quenched wear‐resistant steel by deformed austenite
Improvement of mechanical properties and wear resistance of direct‐quenched wear‐resistant steel by deformed austenite
复制标题
变形奥氏体提高直接淬火耐磨钢的力学性能和耐磨性
DOI：
10.1002/srin.202200903
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发表时间：
2023
影响因子：
2.2
通讯作者：
Zhaodong Wang
中科院分区：
文献类型：
--
作者：
Ye Jia;Xiangtao Deng;Qi Wang;Chengru Li;Zhaodong Wang
本文研究了热机械控制加工（TMCP）和直接淬火（DQ）工艺，与再加热淬火（RQ）工艺相比，以改善耐磨钢的机械和磨损性能。采用扫描电子显微镜、电子背散射衍射、透射电子显微镜和X射线衍射对DQ和RQ试样的微观结构进行表征，并使用维氏硬度、冲击、拉伸和搅拌磨损试验对两种工艺的机械和磨损性能进行研究。结果表明，DQ钢具有较强的塑性、冲击韧性和耐磨性，DQ工艺还保留了未再结晶区轧制形成的变形奥氏体。压缩奥氏体减小了马氏体板条和块状组织的尺寸，增加了大角度晶界的密度和比例，提高了DQ钢的塑性和韧性。同时，DQ钢还继承了轧制过程中产生的高密度位错，这是其主要的强化机制。DQ钢中的变形晶粒降低了Schmid因子，提高了抗磨损变形能力，提高了其耐磨性能。
Herein, thermomechanically controlled processing (TMCP) and direct‐quenching (DQ) process are investigated to improve the mechanical and wear properties of wear‐resistant steel, compared to the reheating–quenching (RQ) process. Scanning electron microscope, electron backscatter diffraction, transmission electron microscope, and X‐ray diffraction are employed to characterize the microstructures of the DQ and RQ specimens, and the mechanical and wear properties are investigated using the Vickers hardness, impact, tensile, and stirring wear tests for both processes. The results show that DQ steel exhibits strong plasticity, impact toughness, and wear resistance; the DQ process also retains the deformed austenite formed by rolling in the nonrecrystallization region. The compressed austenite reduces the size of the martensite lath and block structure, increases the density and proportion of the high‐angle grain boundaries, and improves the plasticity and toughness of DQ steel. Meanwhile, DQ steel also inherits the high‐density dislocations created during the rolling process, which is its primary strengthening mechanism. The deformed grains in DQ steel reduce the Schmid factor, improve resistance to wear deformation, and enhance its wear performance.