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Study on the Preferred Orientation Usiug White Neutron

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Lee Yun-Peel,
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 ( Lee Yun-Peel ) 
Korea Atomic Energy Research institute

Abstract

°­ÇÑ ¹æÇ⼺ÀÌ ÀÖ´Â ´Ù°áÁ¤¿¡ ÀÇÇÑ Áß¼ºÀÚȸÀý°­µµ¿¡ ´ëÇÑ Àç·¡ÀÇ °ø½ÄÀ» °áÁ¤ÀÇ ¹Ý»çÀ²¿¡ °üÇÑ Kunitomi ÀǽÄÀ» »ç¿ëÇÏ¿© ¼öÁ¤ÇÏ¿´´Ù. ½Ã·á³»ÀÇ grain¿¡¼­ ȸÀýÀÌ ÀϾ´Â Á¤È®ÇÑ À§Ä¡°¡ ȸÀý°­µ¿ÀÇ Maxwell °î¼±ÀÇ ¼Ò°¢ºÎºÐ¿¡ °üÇÑ ÀÌ·ÐÄ¡¿Í °è»êÄ¡¸¦ ºñ±³ÇÔÀ¸·Î½á ¹ß°ßµÈ´Ù´Â »ç½Ç°ú À§ÀÇ È¸Àý°­µµ °ø½ÄÀ» »ç¿ëÇÏ¿© ±Ý¼Ó³»ÀÇ Preferred orientationÀ» ¹é»öÁß¼ºÀÚ¸¦ °¡Áö°í Á¶»çÇÒ ¼ö ÀÖ´Â ¹æ¹ýÀ» °í¾ÈÇÏ¿´´Ù. °áÁ¤³»¿¡¼­ ÀϾ´Â Áß¼ºÀÚÀÇ ´ÙÁ߹ݻç¿Í Èí¼ö¿¡ ´ëÇØ¼­ ±³Á¤ÇÏ¿© ¿øÀÚ·ÎÀÇ Áß¼ºÀÚ ½ºÆåÆ®·³À» ÃøÁ¤ÇÔÀ¸·Î½á ¿­Áß¼ºÀÚÀÇ È®½Ç¼ºÀÖ´Â ÆÄÀåÀÌ 1.025¡¾0.001¡ÊÀÓÀ» ¾Ë¾Ò´Ù.
´ëºÎºÐ cube-on-face ¹æÇâÀ» °®ÀÎ ¾Á¸®ÄÜ °­Ã¶À» º» ¿¬±¸¹æ¹ýÀ¸·Î Á¶»çÇÏ¿´´Â¹Ù grainµéÀÌ ¾Ð¿¬¹æÇâ¿¡¼­ 5µµ À̳»¿¡ ¹è¿­µÇ¾î ÀÖ´Ù´Â »ç½ÇÀ» ¹ß°ßÇÏ¿´´Ù. Ä¿´Ù¶õ °áÁ¤¿¡ ÀûÇÕÇÑ À̷еéÀÌ °­ÇÑ ¹æÇ⼺ÀÌ ÀÖ´Â ´Ù°áÁ¤ ¹°Ã¼¿¡µµ Àû¿ëµÉ ¼ö ÀÖÀ½À» ¾Ë°Ô µÇ¾ú´Ù.
The previous exprssion for the diffracted neutren intensity by a highly oriented polycrystalline is modified using the Kunitomi¢¥s formula of the crystal reflectivity. The method of studying the preferred orientation in metals with white neutron is proposed utilizing the above formula and the fact that the real position of the diffraction of certain grain in the sample can be found by the comparison of the smaller angle part of the maxwellian curve of the calculated intensity of neutrons diffracted and the experimenal curves. The most probable wavelength of thermal neutrons from the reactor is found by the measurement of the neutron spectrum with the correction for the crystal about the multiple reflection and the absorption of neutrons and turned out to be 1.025 ¡¾ 0.001A. The preferred orientations of some electric steel sheets, mostly with the cube¡©on-face orientations, are investigated by the present method. The orientations of most grains relative to the rolling directions are found to be within 5 degrees. It is found the most of theories for large crystals may be extended to highly oriented polycrystalline materials without extensive modification.

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