期刊文献+
共找到3篇文章
< 1 >
每页显示 20 50 100
INFLUENCE OF INTERNAL HYDROGEN ON THE HYDROGENEMBRITTLEMENT OF AUSTENITIC STAINLESS STEEL 被引量:1
1
作者 Y Tan D.H Zhouand J. Feng (Institute of Structural Mechanics, Chengdu 610003, China) 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 1997年第3期228-232,共5页
The HE (hydrogen embrittlement) behavior of two kinds of austenitic stee Cr21Ni6Mn9 and 1Cr18Ni9Ti is reprted in this paper. The factors (temperc-ture/strain rate/stress concentration coefficient and purity of hydroge... The HE (hydrogen embrittlement) behavior of two kinds of austenitic stee Cr21Ni6Mn9 and 1Cr18Ni9Ti is reprted in this paper. The factors (temperc-ture/strain rate/stress concentration coefficient and purity of hydrogen) are restricted to the severe conditions under which HE is easy to occur. The concentmtion of in-ternal hydrogen in samples is changed by varying the time during which samples are placed in 24 MPa hydrogen at 473 K Then the tensile properties of the samples are tested. The results indicate that the degree of the hydrogen-induced plastic loss (L)of Cr21Ni6Mn9 is different with the internal hydrogen(CH). Howeven even when CH is as high as 70 PPm L is 15% and the fracture may be explained as a larpe amount of internal hydrogen hinders the cross-slip of dislocations when the steel is deforming.For the metastable steel 1Cr18Ni9Ti the hydrogen-induced plastic loss is severer than that of Cr21Ni6Mn9. When CH is 40 PPm its L is as high as 42%. The mechanism may be explained as a larpe amount of hyderpen decreases the stacking fault enerpy and brittle ε-phase is produed in the high CH areas. 展开更多
关键词 austenitic stainless steel internal hydrogen hydrogen embrittlement hydrogen-induced ductility loss
下载PDF
NO_x emission characteristics of hydrogen internal combustion engine 被引量:1
2
作者 孙柏刚 段俊法 刘福水 《Journal of Beijing Institute of Technology》 EI CAS 2014年第3期332-338,共7页
To study the economic advantages of hydrogen internal combustion engine, an experimen- tal study was carried out using a 2.0 L port fuel-injected (PFI) hydrogen internal combustion engine. Influences of fuel-air equ... To study the economic advantages of hydrogen internal combustion engine, an experimen- tal study was carried out using a 2.0 L port fuel-injected (PFI) hydrogen internal combustion engine. Influences of fuel-air equivalence ratio φ, speed, and ignition advance angle on heat efficiency were determined. Test results showed that indicated thermal efficiency ( ITE ) firstly increased with fuel- air equivalence ratio, achieved the maximum value of 40. 4% ( φ = 0.3 ), and then decreased when was more than 0. 3. ITE increased as speed rises. Mechanical efficiency increased as fuel-air equiva- lence ratio increased, whereas mechanical efficiency decreased as speed increased, with maximum mechanical efficiency reaching 90%. Brake thermal efficiency (BTE) was influenced by ITE and me- chanical efficiency, at the maximum value of 35% (φ =0.5, 2 000 r/min). The optimal ignition ad- vance angle of each condition resulting in the maximum BTE was also studied. With increasing fuel- air equivalence ratio, the optimal ignition angle became closer to the top dead center ( TDC ). The test results and the conclusions exhibited a guiding role on hydrogen internal combustion engine opti- mization. 展开更多
关键词 hydrogen internal combustion engine thermal efficiency fuel-air equivalence ratio SPEED ignition advance angle
下载PDF
Hydrogen emission at grain boundaries in tensile-deformed Al-9%Mg alloy by hydrogen microprint technique
3
作者 Ryoto KOYAMA Goroh ITOH 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第7期2102-2106,共5页
In recently years, environmental problems, such as global warming and exhaustion of fossil fuels, have grown into serious problems. In the automakers, the development of the fuel cell vehicles using hydrogen as clean ... In recently years, environmental problems, such as global warming and exhaustion of fossil fuels, have grown into serious problems. In the automakers, the development of the fuel cell vehicles using hydrogen as clean energy has been paid attention to. Aluminum alloys have already been applied to a liner material of a high-pressure hydrogen tank for fuel cell vehicles. However, the behavior of hydrogen in aluminum alloys has not been clearly elucidated yet. Therefore, it is necessary to analyze the hydrogen behavior in aluminum alloys. Hydrogen microprint technique (HMPT) has been known as an effective measure to investigate the hydrogen behavior. In the present study, the emission behavior of internal hydrogen on a tensile-deformed Al-9%Mg alloy was investigated bv HMPT at room temoerature. As a result, the hydrogen was emitted at some grain boundaries. 展开更多
关键词 aluminum-magnesium alloy internal hydrogen hydrogen microprint technique grain boundary
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部