??>?? `b????_??????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????9 ?R??bjbj????r0????? ??????l???????$ZZZZP?$?4Z?????????$E e dE????I?????????L??? ?>?Iw?ZZ??_0?? ?:? ? 8"??????pYt?]z??Spe?[?N?f?Sb_?v??g?c4Y?~?~?vq_?T ?NGY ??Y?ldW ?-??z?Q ????G? ??S?]N'Yf[Pg?ef[b?,U?? ??[?710072 ? Xd??? ,g?e?走?pYt?]z??Spe?v?SSxvz?N?Sb_?v?~??g?c4Y?~?~?Svf?|?^?SS??_0?[???~?gh?f ?/_?b?Ss^?N?f?Sb_T??@w?pYt?R?p)n?^?v?c? ??Q?~vfb_8h?s?X?R ?(W720?C N?~ 0.5\?e?O)nT ?vf?|?~SHe?gf>f ? q?T?kPg?vvf?|?^?~?]?S?Q\0R0.5?~??O)n?e? N?[?^? ?&TRvf?|O?'Y??N?f?Sb_?_?s!kpe N?[走Y ??pYt)n?^?^NO0?O)n?e??^?w?N0 sQ.??? ?~?? q? vf?|?~S? ?N?f?Sb_??pYt -N?VR{|?S?TG441.8 Effects of Heat Treatment Processing Parameters on microstructure of Deformed Titanium Welding joint GAO Shi-Qi, YAO Ze-kun, TAN Li-Jun , GUO Hong-zhen (Department of Materials, Northwestern Polytechnical University,Xi an710072 ?China) Abstract: The microstructure evolution of pure titanium welding joint during isothermal bending and heat treatment was investigated. The results show that after the alternate deformation with the increase of the heat treatment temperature, the nucleation ratio of recrystallization raises, the grain size difference could reduce to a half level when soaking for 0.5h at 720?C; it isn?t suitable increasing the soaking time, otherwise the grains grow up. Alternate bending times should not be too much, the heat treatment should be lower and the soaking time should be shorter. Key words: pure titanium welded joint; grain refinement; alternate deformation; heat treatment ?~????/fu?N5u???{?v???hV?N ??vMR ??V?Qu?N?v?e?~????g'Y?v?_:N2200mm ?2700mm?SvQ?N N?v?_?vg????S???O`?wSg q?c?e?l6R ?0FO q?c?e ? qN?WSO?v?~?~ N T ?vf?|:\?[?v?]u'Y ??[?5u???{(W qY?Q?sN?WSOY NN?v??r? ?sSX[(Wr??] ??g'Y0Wq_?T?N??{?v?T(?[1-2]0 O@bhT?w ??q qT ? qY:N?Q?V?~?~ ?vf?|?|'Y ?N?u~g0zzm0??~I{?Q忸:w? 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