Solid Solution Hardening by Ca rbon and Nitrogen and Low Cyclic Fatigue Softening of Austenitic Steels.

为了阐明碳和氮对由碳和/或氮强化的奥氏体钢的低循环疲劳软化的影响，研究了以下内容。1.碳和硅对不锈钢的强化的影响：结果表明，软化不仅是由低层错能引起的，碳（和氮）是软化所必需的，硅增强了碳的这种作用（和氮）.2.黄烷的观察（X射线吸收近边结构）和EXAFS不锈钢和高锰无磁钢的X射线吸收精细结构扩展图利用筑波高能物理国家实验室光子工厂的同步辐射，阐明了实验技术有可能阐明存在于取代原子如铬周围的碳和氮原子的结构和量，锰或镍。3.塑性变形计算机模拟实验台的构建阐明了计算机模拟可以较好地再现塑性变形行为及其伴随现象。

Followings were investigated in order to clarify the effects of carbon and nitrogen on low cyclic fatigue softening of austenitic steels strengthened by carbon and/or nitrogen.1.THE EFFECTS OF CARBON AND SILICON ON THE SOFTENING OF STAINLESS STEELS: It was concluded that the softening was not induced only by low stacking fault energy, carbon (and nitrogen ) was necessary for the softening and silicon enhanced this effect of carbon (and nitrogen ).2.OBSERVATION OF XANES(X-RAY ABSORPTION NEAR EDGE STRUCTURE)AND EXAFS(EXPANDED X-RAY ABSORPTION FINE STRUCTURE) OF STAINLESS AND HIGH MANGANESE NON-MAGNETIC STEELS: Using synchrotron radiation of the Photon Factory in national laboratory for high energy physics at Tsukuba, it was clarified that the experimental techniques were potential to elucidate the structure and the amount of carbon and nitrogen atoms existing around substitutional atoms such as chromium, manganese or nickel. Detail analyses are now in progress.3.CONSTRUCTION OF PROGRAM FOR COMPUTER SIMULATION OF PLASTIC DEFORMATION; It was elucidated that the plastic deformation behavior and the accompanied phenomena could be reproduced fairly well by the computer simulation.