Dynamic Strain Aging of Austenitic High Nitrogen Cr-Ni and Cr-Mn Steels
Dynamic Strain Aging of Austenitic High Nitrogen Cr-Ni and Cr-Mn Steels
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奥氏体高氮Cr-Ni和Cr-Mn钢的动态应变时效
DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
H. Hänninen
中科院分区：
文献类型：
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作者：
R. Ilola;M. Kemppainen;H. Hänninen
通过拉伸试验研究了固溶退火Cr-Ni和Cr-Mn型奥氏体高氮钢的动态应变时效（DSA）。钢的氮含量从0.26到1.00 wt. %不等。在室温至800℃之间，以0.00005至0.031 1/s的应变速率进行拉伸试验。奥氏体HNSs在高温下表现出DSA，这是由扩散的溶质原子和移动的位错之间的相互作用引起的。塑性变形激活能较低，表明600℃以下为管道扩散，800℃时为体扩散。通过内摩擦测量得到氮扩散的活化能约为1.95 eV。
Dynamic strain aging (DSA) of solution annealed Cr-Ni and Cr-Mn type austenitic high nitrogen steels (HNS) was investigated by means of tensile tests. Nitrogen content of the steels varied from 0.26 to 1.00 wt. %. Tensile tests were performed at strain rates from 0.00005 to 0.03 1/s between room temperature and 800 °C. Austenitic HNSs exhibit DSA at elevated temperatures, which is caused by interactions between diffusing solute atoms and moving dislocations. Low activation energies for plastic deformation in the studied steels indicate that the diffusion mechanism is pipe diffusion below 600 °C, and also bulk diffusion at 800 °C. An activation energy for nitrogen diffusion of about 1.95 eV was determined by internal friction measurements.