Tensile behaviour of a nanocrystalline bainitic steel containing 3 wt% silicon
Tensile behaviour of a nanocrystalline bainitic steel containing 3 wt% silicon
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DOI：
10.1016/j.msea.2012.04.031
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发表时间：
2012-07-15
期刊：
影响因子：
6.4
通讯作者：
Elvira, R.
中科院分区：
文献类型：
--
作者：
Garcia-Mateo, C.;Caballero, F. G.;Elvira, R.
近年来，人们对贝氏体纳米钢的微观结构和力学性能进行了大量的研究。在125-350℃的温度下进行等温热处理，形成显微组织，相应的钢种通常含有高碳含量，以达到B-s-M-s温度范围的充分消耗，并在等温保温期间高于1.5 Si wt.%以抑制碳化物的形成。对于后者，大多数已发表的文献都同意在1.2-1.5 wt.%左右抑制高碳钢中的渗碳体。也许由于这个原因，在纳米结构贝氏体钢的背景下，没有系统地研究明显超过该限值的Si添加量。目前的工作是关于高达类似于3si wt.%的影响，在适合于低温贝氏化的钢牌号。与同类牌号相比，虽然Si含量较低，但拉伸性能却表现出无与伦比的强度和延展性组合，在2 GPa以上的UTS中，总伸长率超过21%。试图解释这种微观结构的力学性能的一些最相关的和独特的形态和微观结构特征。(c) 2012 Elsevier B.V.版权所有
Much recent work has been devoted to characterize the :microstructure and mechanical properties bainitic nanostructured steels. The microstructure is developed by isothermal heat treatment at temperatures as low as 125-350 degrees C and adapted steel grades typically contain high carbon contents to achieve sufficient depletion of the B-s-M-s temperature range, and above 1.5 Si wt.% to suppress carbide formation during isothermal holding. On the latter, most of the published literature agrees on a limit of around 1.2-1.5 wt.% to suppress cementite in high carbon steels. For this reason perhaps, additions of Si significantly above this limit have not been investigated systematically in the context of nanostructured bainitic steels. The present work is concerned with the effect of up to similar to 3 Si wt.% in a steel grade adapted to low temperature bainitizing. Tensile properties as compared to similar grades, though with lower Si contents, exhibited unrivalled combinations of strength and ductility, with above 21% total elongation for a UTS above 2 GPa. An attempt is made to explain the mechanical properties of this microstructure in terms of some of its most relevant and unique morphological and microstructural features. (c) 2012 Elsevier B.V. All rights reserved.