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首页> 外文会议>Iron Steel Supplement 2005 vol.40: The Joint International Conference of HSLA Steels 2005 and ISUGS 2005 >Effect of Nitrogen Addition on the Properties of Hot-rolled High-strength Low-alloying Steels Containing V and Mo
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Effect of Nitrogen Addition on the Properties of Hot-rolled High-strength Low-alloying Steels Containing V and Mo

机译：氮的添加对含钒钼钼热轧高强度低合金钢性能的影响

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摘要

The effects of nitrogen addition on the microstructural evolution, tensile properties at both room temperature and 600 °C as well as the charpy impact absorbed energy at 0°C have been investigated in two series of hot-rolled high-strength, low-alloy steels containing both V and Mo(one with 0.60%Mo, the other with 0.50%Cr+0.30%Mo) under several hot-rolling conditions. These steels were microalloyed with either vanadium ferroalloy or VN alloy for comparison and fabricated by four-pass hot rolling with different slab reheating temperatures followed by air cooling or simulated coiling at 600°C. The microstructures of 0.60%Mo steels and 0.50%Cr-0.30%Mo steels were adjusted from polygonal ferrite dominated to bainite dominated by altering slab reheating temperature or/and cooling strategies. For the polygonal ferrite dominated microstructure and the bainite dominated microstructure, the addition of both vanadium and nitrogen enhanced both the room-temperature yield strength and the high-temperature yield strength. The control of the bainite fraction in the microstructure is essential to obtain good high-temperature yield strength even for steels containing 0.60%Mo. The addition of nitrogen in the experimental steels resulted in a increase of the vanadium content as precipitates and the precipitates seemed to become finer and denser, especially when accelerated cooling after hot-rolling was used. The effect of vanadium on the strengthening at both room temperature and 600°C might be attributed to the precipitation of vanadium enhanced by nitrogen addition or/and accelerated cooling. The charpy absorbed energy at 0°C was decreased as the bainite/Martensite constitute in the microstructure increased. If a suitable fraction of polygonal ferrite was introduced in the microstructure, good toughness could be obtained while the high-temperature yield strength were still kept at high level.
机译：在两个系列的热轧高强度低合金钢中，研究了氮的添加对室温和600°C时的组织演变，拉伸性能以及夏比冲击吸收能的影响。在几种热轧条件下均含有V和Mo（一个含0.60％Mo，另一个含0.50％Cr + 0.30％Mo）。为了进行比较，这些钢用钒铁合金或VN合金微合金化，并通过在不同的板坯加热温度下进行四道次热轧，然后进行空冷或在600°C进行模拟卷取来制造。通过改变板坯的加热温度或冷却策略，将0.60％Mo钢和0.50％Cr-0.30％Mo钢的组织从多边形铁素体转变为贝氏体。对于多边形铁素体为主的组织和贝氏体为主的组织，钒和氮的添加均提高了室温屈服强度和高温屈服强度。即使对于含0.60％Mo的钢，控制组织中的贝氏体分数对于获得良好的高温屈服强度也是必不可少的。在实验钢中添加氮会导致钒含量的增加，这是由于析出物的缘故，并且析出物似乎变得更细和致密，尤其是在使用热轧后进行加速冷却时。钒在室温和600°C时对强化的影响可能归因于氮的添加或加速冷却导致钒的沉淀。随着微结构中贝氏体/马氏体组成的增加，夏比在0°C时的吸收能降低。如果在显微组织中引入适当比例的多边形铁素体，则可以获得良好的韧性，而高温屈服强度仍保持在高水平。

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