PM synthesis and properties of steel foams
PM synthesis and properties of steel foams
复制标题
DOI：
10.1016/s0921-5093(00)00761-9
复制
发表时间：
2000-08
期刊：
影响因子：
6.4
通讯作者：
C. Park;S. Nutt
中科院分区：
文献类型：
--
作者：
C. Park;S. Nutt
泡沫钢是通过粉末冶金方法合成的，其密度小于钢的一半。研究了泡沫合成的工艺参数，并选择了两种标准粉末配方，其组成为Fe-2.5%C和0.2wt.%发泡剂（MgCO 3或SrCO 3）。使用PM方法，获得相对密度在0.38和0.64之间的泡沫。对不同密度的退火和预退火泡沫样品进行压缩测试，以确定机械响应和能量吸收行为。应力-应变响应受到退火的强烈影响，退火降低了碳含量并将大部分珠光体结构转化为铁素体。这些微观结构的变化导致更延性的响应在压缩加载过程中，其中一个长的应力平台通常发生在初始屈服后。事实上，退火的泡沫钢在压缩载荷下表现得很像泡沫铝，尽管孔结构比泡沫铝报告的孔结构粗糙得多。
Steel foam steel was synthesized by a powder metallurgical route, resulting in densities less than half that of steel. Process parameters for foam synthesis were investigated, and two standard powder formulations were selected consisting of Fe–2.5%C and 0.2 wt.% foaming agent (either MgCO3or SrCO3). Using the PM approach, foams with relative density ranging between 0.38 and 0.64 were obtained. Compression tests were performed on annealed and pre-annealed foam samples of different density to determine mechanical response and energy absorption behavior. The stress–strain response was strongly affected by annealing, which reduced the carbon content and converted much of the pearlitic structure to ferrite. These microstructural changes led to a more ductile response during compressive loading, in which a long stress plateau typically occurred after initial yielding. In fact, annealed steel foams behaved much like aluminum foams under compressive loading, despite pore structures that were considerably more coarse than those reported for aluminum foams.