变形速度和温度对高氢钛合金脆性的影响.pdfVIP

第 38 卷 增刊 VoJ. 38 SuppJ. 命品专址 2002 年 9 月 226-229 页 ACTA META LLUR GI CA SIN ICA Sept. 2002 pp . 226- 229 变形速度和温度对高氢铁合金脆性的影响* 王者昌 陈怀宁 (中国科学院金属研究所，沈阳 110016) 摘要 分析了 Kolachev 提出的产生氯脆条件的原理阁.指出它与实验结果之间的矛盾. 用实磁证实含氧 0.023% 的 Ti--{ìAl- 5 1 4V 合金焊接接头在低速变形 (10- 5- ) 时塑性得到l 完全恢复提出位错与 Cottrell 气团的距离为 Lo 时位错钉扎作用最大. 院化效果也最大. 提高变形速度和降低温度都能使位错和 Cottrell 气园的问延增加， 反之[i!lJ减小因此氢脆在一定的变形速度和温 度范围内发生.综合氢脆、高速和低温胧俭，提出了产生脆住条件的原理即实验研究证实， 超理性成形、伴随地氢的 Ti--{ìAl-4V 焊接接头存在氢胧倾向，提出嫁后真空热处理既可除氢、恢复力学位能，又能起到消除焊接残余应力的作用. 关键词 铁合金，氨脆 中图法分类号 TGI4P, TG ll.1.91 文献标识码 A 文章编号 04 12- 1961(2002)5 - 5226- 04 X x EFFECTS OF DEFOR孔I[ATION RATE AND TE肌I[PERA­ TUREONTHEE岛1BRITT.LEMENT OF TITANIUM ALLOY WITH HIGH HYDROGEN CONTENT WANG Zhechang, CHEN H uaining lnstitute of Metal Re盹arcb， The Chine盹 Academy of Sciences, Shenyang 110016 Correspo饨dent: WANG Zhechang, professo飞 Tel: (024- 55401 Manuseript received 2002-03- 25 ABSTRACT The principle diagram of determining hydrogen embrittlement proposed by Kolachev was analyzed and its illogicality was put forward. It was proved experimentally that the plasticity of welded joint of Ti-6Al咀4V with O.023%H was fully restored under 10- 5 5- 1 deformation ra te. It was a 150 suggested t hat when the distance L between dislocation and Cottrell atmosphere is equal to Lo , the dislocat ion s pinning has maximUID effect which forms substantial role of embrittlement. Moreover , both increase of t he deformation rate and decrease of the temperat ure make L greater. There