The effect of hydrogen charging on the mechanical properties of leaded α/β brass cast alloy

被引:2
|
作者
Panagopoulos, C. N. [1 ]
Giannakopoulos, K. I. [2 ]
机构
[1] Natl Tech Univ Athens, Met Phys Lab, Athens 15780, Greece
[2] Piraeus Univ Appl Sci, Lab Strength Mat, Athens 12244, Greece
来源
MATERIALIA | 2019年 / 5卷
关键词
Brass; Hydrogen embrittlement; Diffusion; Fick's law; Metal hybrid; mechanical properties; Tensile; SPONTANEOUS DISSOLUTION; FRACTURE PROCESSES; INDUCED CRACKING; COPPER HYDRIDE; DEFORMATION; BEHAVIOR; EMBRITTLEMENT; POROSITY; STRESS; NICKEL;
D O I
10.1016/j.mtla.2018.100184
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
At the present work, the effect of the cathodic charging on the mechanical properties of leaded alpha/beta brass cast alloy was investigated. The charging conditions of the test samples were as follows: current density: (a) 5 mA/cm(2), (b) 20 mA/cm(2), (c) 40 mA/cm(2) and (d) 55 mA/cm(2). The durations of the charging of the test samples were (a) 5 h, (b) 10 h, (c) 15 h, (d) 25 h and (e) 50 h. For the samples that underwent tensile stress at three different rates of loading, the following conditions of hydrogen cathodic charging were selected: current density: 20 mA/cm(2) with charging time of (a) 5 h, (b) 20 h and (c) 40 h. All of the samples were subjected to tensile stress tests with a constant deformation rate of 10(-4)sec(-1). The main conclusions for the above investigation are that the average value of the microhardness of the surface of the cathodically charged test samples was found to increase with the increase in the current density of cathodic charging at a constant value of cathodic charging time and with the increase of the cathodic charging time at a constant value of current density, in addition to an decrease of the microhardness value of the cathodically charged test samples with increased distance from the test sample's surface. The maximum width of the affected area, under the conditions of the experiment, was 550 mu m. The ductility of the cathodically charged test samples was notably reduced compared to that of the uncharged material, compared to the uncharged material.
引用
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页数:8
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