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首页> 外文期刊>Journal of Materials Science >Effect of austenitizing temperature and cooling rate on the structure and properties of a ultrahigh strength low alloy steel
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Effect of austenitizing temperature and cooling rate on the structure and properties of a ultrahigh strength low alloy steel

机译：奥氏体化温度和冷却速率对超高强度低合金钢组织和性能的影响

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摘要

A 0.3C-CrMoV(ESR) steel is being developed primarily for making pressure vessels used for aerospace applications. Since it is important to understand the range of microstructures and mechanical properties that will be obtained in the heat affected zone of welds, the steel has been subjected to different austenitizing treatments (temperatures ranging from 925 degrees C to 1250 degrees C) followed by cooling at various rates to room temperature. It has been shown that the austenite grain size increased from about 10 to 250 mu m as the austenitizing temperature is increased from 925 degrees C to 1250 degrees C (1 hr) and that the hardness, YS, UTS,% elongation and% reduction in area as well as CVN energy for 450 degrees C tempered condition decrease as the austenitizing temperature is increased for all cooling rates (furnace cooling, air cooling, oil quenching, quenching and tempering at 450 degrees C). This is attributed mainly to the increase in austenitic grain size. The ranges of microstructures that can be obtained in the heat-affected zone are massive ferrite, fine pearlite, upper as well as lower bainite and martensite. The Charpy impact energy for the oil-quenched steel tempered at 200 degrees C, however, did not vary significantly with austenitizing temperature.
机译：正在开发一种0.3C-CrMoV（ESR）钢，主要用于制造用于航空航天应用的压力容器。由于了解在焊接热影响区中获得的显微组织和机械性能的范围很重要，因此对钢进行了不同的奥氏体化处理（温度范围为925摄氏度至1250摄氏度），然后在各种速率到室温。结果表明，随着奥氏体化温度从925摄氏度增加到1250摄氏度（1小时），奥氏体晶粒尺寸从大约10微米增加到250微米，并且硬度，YS，UTS，伸长率和减少率降低了。在所有冷却速率下（炉冷却，空气冷却，油淬，在450℃淬火和回火），随着奥氏体化温度的升高，在450℃回火条件下的表面积和CVN能量都会降低。这主要归因于奥氏体晶粒尺寸的增加。在热影响区可获得的微观结构范围是块状铁素体，细珠光体，上贝氏体和下贝氏体和马氏体。但是，在200℃回火的油淬火钢的夏比冲击能并未随奥氏体化温度而显着变化。

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