MICROSTRUCTURES AND MECHANICAL PROPERTIES OF AN ULTRA-FINE ACICULAR FERRITE/BAINITE STEEL PLATE
MICROSTRUCTURES AND MECHANICAL PROPERTIES OF AN ULTRA-FINE ACICULAR FERRITE/BAINITE STEEL PLATE
复制标题
超细针状铁素体/贝氏体钢板的组织与力学性能
DOI：
--
复制
发表时间：
2013
期刊：
影响因子：
--
通讯作者：
G. Liang
中科院分区：
文献类型：
--
作者：
S. Yuan;G. Liang
在中试可逆轧机上，通过合理的化学成分设计和先进的热处理工艺，获得了超细针状铁素体/贝氏体组织。同时，利用光学显微镜和透射电镜技术分析了超细组织的形成机理及其对力学性能的影响。实验结果表明：在所测试的Mn-Mo-Nb-B超低碳微合金钢，在非再结晶区压缩比达到7时，产生的贝氏体包尺寸小于1 m，饼状晶粒（平整的奥氏体晶粒）的平均厚度小于5 m。获得了抗拉强度R m >1000 MPa、伸长率%EL A >14 %、缺口冲击A KV >120 J （-30 g C）等优异性能。超细钢的高强度和较好的韧性与子结构的变化有关，即烙饼厚度、贝氏体包的宽度和第二粒子钉住的更密集的位错。试验钢的化学成分（wt.%）为0.039C、0.34Si、1.94Mn、0.018Ti、0.33Mo、0.44Ni、0.094Nb、0.52Cu、0.0021B和平衡铁。其他杂质分别为（wt.%）： 0.0052 2p, 0.0014S， 0.0080N和0.0066O。将钢锭再加热至1230℃1.5 h，然后进行轧制。热轧是
The ultra-fine acicular ferrite/bainite microstructures were experimentally obtained through proper chemical composition design and advanced thermomechanical processing schedules in pilot reversing mill. At the same time, the formation mechanism of ultra-fine microstructures and its effects on the mechanical properties were analyzed by optical microscopy and TEM technique. The experimental results indicate that: for the tested Mn-Mo-Nb-B ultra-low carbon microalloyed steel, the size of bainitic packets less than 1 m and the average thickness of pancakes (flatted prior austenitic grains) less than 5 m were produced when the compression ratio reaches 7 in non-recrystallization region. The excellent properties, that is, tensile strength R m >1000 MPa, the percentage elongation (%EL) A >14 % and charpy notch impact A KV >120 J (-30 g C) have been achieved. The high strength accompanying better toughness of the ultra-fine tested steel is correlated with the changes in substructures, i.e. the thickness of pancakes, the width of bainitic packets and denser dislocations pinned by second particles. chemical composition (wt.%) of the tested steel was 0.039C, 0.34Si, 1.94Mn, 0.018Ti, 0.33Mo, 0.44Ni, 0.094Nb, 0.52Cu, 0.0021B and balance Fe. The other impurities were (wt.%): 0.0052P, 0.0014S, 0.0080N, and 0.0066O. The ingot was reheated to 1230 g C for 1.5 h followed by rolling process. Hot rolling was