THE INFLUENCE OF MICROSTRUCTURE ON THE SUSCEPTIBILITY OF TITANIUM-ALLOYS TO INTERNAL HYDROGEN EMBRITTLEMENT
THE INFLUENCE OF MICROSTRUCTURE ON THE SUSCEPTIBILITY OF TITANIUM-ALLOYS TO INTERNAL HYDROGEN EMBRITTLEMENT
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DOI：
10.1007/bf02647828
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发表时间：
1982-01-01
期刊：
影响因子：
--
通讯作者：
LEVERANT, GR
中科院分区：
文献类型：
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作者：
HACK, JE;LEVERANT, GR
研究发现，经过β处理的具有大团团微观结构的近α钛合金在持续负载或峰值负载停留期间的疲劳循环条件下容易发生内部氢脆。脆化是由于在随时间变化的塑性变形过程中形成的长块剪切带顶端氢含量局部增加而发生的。导致脆化过程的关键微观结构特征已被确定为大的转变β集落尺寸和集落内β相的精细、不连续分布。含有厚的、连续的β片状体的α-β合金被确定不会脆化。结果与先前提出的脆化过程模型一致。
Beta-processed near-alpha titanium alloys with a large colony microstructure were found to be susceptible to internal hydrogen embrittlement under conditions of sustained loading or fatigue cycling with a dwell period at peak load. The embrittlement occurs by localized increases in hydrogen content at the tips of long, blocked shear bands developed during time-dependent plastic deformation. The key microstructural features responsible for the embrittlement process have been determined to be a large transformed beta colony size and a fine, discontinuous distribution of beta phase within the colony. Alpha-beta alloys that contain thick, continuous beta platelets were determined to be immune to embrittlement. The results are consistent with a previously-proposed model for the embrittlement process.