Influence of thermomechanical treatment on rnicrostructure and mechanical properties of a microalloyed (Nb+V) weather-resistant steel
Influence of thermomechanical treatment on rnicrostructure and mechanical properties of a microalloyed (Nb+V) weather-resistant steel
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DOI：
10.1016/j.msea.2005.01.049
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发表时间：
2005-06-15
期刊：
影响因子：
6.4
通讯作者：
Sarma, DS
中科院分区：
文献类型：
--
作者：
Prasad, SN;Sarma, DS
研究了(Nb+V)微合金化(Nb+V)耐候钢在1000℃和100℃保温后的形变热处理对组织和性能的影响。该钢含有0.2%C，1%Mn，0.3%Si，0.5%Cr，0.45%Cu，0.3%Ni，0.054%Nb和0.046%V。研究发现，在1000℃等温后，将轧制温度从900℃降低到700℃，可使钢的屈服强度显著提高到25%或50%。在700℃轧制后，钢的抗拉强度和硬度均有较大幅度的提高，在所研究的所有轧制温度下，该钢均为铁素体-珠光体组织。随着轧制温度的降低和变形量的增加，铁素体晶粒度减小。而900℃和800℃轧制后的铁素体形态为多边形，700℃轧制后为非多边形铁素体，在1100℃保温后，800℃轧制50%后屈服强度略有提高，而UTS显著增加。经透射电子显微镜观察，组织转变为铁素体+粒状贝氏体混合组织，组织以马氏体/奥氏体组分为主。热机械处理(在类似于800℃的温度下变形50%)在提高YS和UTS方面是非常有效的。(C)2005 Elsevier B.V.保留所有权利。
The influence of thermomechanical treatment after soaking at 1000 and I 100 C on the structure and properties of a microalloyed (Nb + V) weather-resistant steel has been studied. The steel contains 0.2% C, 1% Mn, 0.3% Si, 0.5% Cr, 0.45% Cu, 0.3 % Ni, 0.054% Nb and 0.046% V. It has been found that after soaking at 1000 degrees C, the yield strength of the steel has increased considerably when rolled to 25 or 50% on decreasing the rolling temperature from 900 to 700 degrees C. The UTS and hardness have not been significantly affected by the rolling temperatures between 800 and 900 C. However, there has been a considerable increase in UTS and hardness after rolling at 700 'C. The steel has given ferrite-pearlite microstructure at all rolling temperatures studied. The ferrite grain size decreases with decreasing rolling temperature and increasing deformation. While the ferrite morphology is polygonal after rolling at 900 and 800 'C. it is non-polygonal after rolling at 700 C. After soaking at 1100 degrees C, the yield strength increases slightly after rolling 50% at 800 degrees C while the UTS increases markedly. The microstructure changes to that of mixed ferrite and granular bainite with the preponderance of martensite/austenite constituent as revealed by transmission electron microscopy. Thermomechanical treatment (with >= 50% deformation at similar to 800 degrees C) is very effective in increasing YS and UTS. (c) 2005 Elsevier B.V. All rights reserved.