Suppression of creep cavitation in precipitation-hardened austenitic stainless steel to enhance creep rupture strength
Suppression of creep cavitation in precipitation-hardened austenitic stainless steel to enhance creep rupture strength
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DOI：
10.1007/s12666-010-0060-7
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发表时间：
2010-11
影响因子：
1.6
通讯作者：
K. Laha;J. Kyono;N. Shinya
中科院分区：
文献类型：
--
作者：
K. Laha;J. Kyono;N. Shinya
在含Ti、Nb和Cu的沉淀硬化奥氏体钢中，发现广泛的蠕变空穴限制了变形抗力对提高长期蠕变断裂强度的有用性。硼铈微合金化显著提高了钢的持久强度和塑性。微合金化显著抑制了钢中晶界滑移和蠕变空洞的形核与长大。俄歇能谱分析表明，微合金化后，腔体表面硼的偏聚取代了硫的偏聚，晶界无硫污染。通过控制微量元素的偏析沿着沉淀硬化来抑制蠕变空穴，提高了奥氏体不锈钢的蠕变断裂强度。
Extensive creep cavitation in Ti, Nb and Cu containing precipitation hardened austenitic steels was found to limit the usefulness of deformation resistance to increase long-term creep rupture strength. The steels were microalloyed with boron and cerium that resulted in increase in creep rupture strength and ductility of the steels significantly. Grain boundary sliding and creep cavity nucleation and growth in the steels were suppressed greatly on microalloying. Auger spectroscopic analysis revealed the segregation of boron instead of sulfur on cavity surface and the absence of sulfur contamination of grain boundary upon the microalloying. Suppression of creep cavitation through the control of trace elements segregation along with the precipitation hardening increased the creep rupture strength of austenitic stainless steels.