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中文摘要：
穿抵抗的钢是热的在一样滚动了完成温度，并且随后对待与常规再热熄灭， tempering 过程(RQ&T ) 并且直接熄灭和 tempering 处理(DQ&T ) 分别地。在微观结构和机械性质上的直接熄灭的效果被使用光显微镜，传播电子显微镜和与电子 backscattered 衍射装备的扫描电子显微镜详细调查。结果证明 RQ 和 DQ 标本的微观结构是板条马氏体和更低的 bainite 的复杂成分。与 RQ 标本相比，在 DQ 标本的更低的 bainite 内容高得多。而且，在 DQ 标本的 bainite 延续到并且分割了优先的奥氏体谷物，它能减少马氏体包尺寸。在 DQ 标本的高角度的边界的比例在 RQ 标本比那高，它可以改进影响坚韧。因为直接熄灭能保留可以在 tempering 过程为碳化物降水提供更多的成核地点的真实缺点，在 DQ&T 标本的碳化物甚至散地好得多、分布式。而且， DQ 和 DQ&T 标本的机械性质比分别地受到 RQ 和 RQ&T 过程的那些优异。
英文摘要：
A wear-resistant steel was hot rolled at the same finish temperature, and subsequently treated with conventional reheat quenching and tempering process （RQ＆T） and direct quenching and tempering process （DQ＆T）, respectively. The effect of direct quenching on the microstructure and mechanical properties was investigated in detail by using optical microscope, transmission electron microscope and scanning electron microscope equipped with electron backscattered diffraction. The results showed that the microstructures of both the RQ and DQ specimens were complex constituents of lath martensite and lower bainite. Compared with the RQ specimen, the lower bainite content in DQ specimen was much higher. Furthermore, the bainite in the DQ specimen extended into and segmented the prior austenite grains, which can decrease martensite packet size. The proportion of high-angle boundary in the DQ specimen was higher than that in the RQ specimen, which may improve the impact toughness. The carbides in DQ＆_T specimen were much finer and distributed even dispersively because direct quenching can retain substantive defects which may provide more nucleation sites for carbide precipitation in the tempering process. Besides, the mechanical properties of DQ and DQ＆T specimens were superior than those subjected to RQ and RQ＆T processes, respectively.
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