Enhancement of Fracture Properties of Wustite by Precipitation
Enhancement of Fracture Properties of Wustite by Precipitation
复制标题
沉淀增强维氏体断裂性能
DOI：
10.1111/j.1151-2916.1974.tb10844.x
复制
发表时间：
1974
影响因子：
3.9
通讯作者：
M. Fine
中科院分区：
文献类型：
--
作者：
M. Mendelson;M. Fine
（1）共格共面Fe_3O_4的析出，（2）共晶分解为α-Fe+ Fe_3O_4，在原奥氏体晶界形成连续的α-Fe网络，使99.5%致密奥氏体（晶粒尺寸23 μm）的再结晶起始能γi和断裂强度σf均显著提高。13vol%Fe_3 O_4的存在导致γ_i和σ_f的增加，这归因于析出相和基体之间解理习性的差异以及裂纹前沿的钉扎。连续的α-Fe网络结构提高了断裂的稳定性，断裂不是灾难性的，而是逐步进行的。γi和σf的提高主要归因于α-Fe断裂时的塑性功。
Both the fracture-initiation energy, γi, and the fracture strength, σf, of 99.5% dense wustite (grain size 23 μm) were substantially increased by (1) precipitating coherent-coplanar Fe3O4, and (2) decomposing the wustite eutectoidally to α-Fe+Fe3O4, forming a continuous α-Fe network at the former wustite grain boundaries. The increase in γi, and σf resulting from the presence of 13 vol% Fe3O4 in wustite was attributed to the difference in cleavage habits between the precipitates and matrix and to crack-front pinning. The continuous α-Fe network increased the fracture stability in that fracture was not catastrophic but progressed in steps. The improvement in γi and σf was attributed mainly to the plastic work in fracturing the α-Fe.