燕山大学学报Issue(5)：385-388,401,5.DOI:10.3969/j.issn.1007-791X.2013.05.002
热老化对核级316LN锻造控氮奥氏体不锈钢微观组织及性能的影响
Influence of thermal aging on microstructure and mechanical properties of nuclear grade 316LN forged austenitic stainless steel
摘要
Abstract
The influence of the thermal aging on dislocation configuration, electrical resistivity and hardness of nuclear grade 316LN forged austenitic stainless steel is studied in this paper. The results show that, as the thermal aging proceeds, the total dis-location density in the austenite matrix decreases. The number of extended dislocations which begins at grain boundary and subse-quently extends to the intragranular is also found to increase with the reduction of the width of the extended dislocation. The dis-location width in the solid solutions is approximately 1.0 m, while after 5 000 h thermal aging the width decreases down to around 0.2 m. The segregation of carbon atoms in and near the grain boundaries might account for the change in dislocation structure. Electrical resistivity also increases with thermal aging time and temperature. After 5 000 h thermal aging the electrical resistivity with temperature increases more rapidly compared with that in the solute state. The micro-hardness of the structures located at in-tragranular and grain boundary is enhanced with thermal aging, however, the micro-hardness difference increases.关键词
锻造316LN/热老化/位错组态/电阻率/显微硬度Key words
forged 316LN/thermal aging/dislocation configuration/electrical resistivity/micro-hardness分类
矿业与冶金引用本文复制引用
王明家,马千,李景丽,张勇,王艳,陈雷..热老化对核级316LN锻造控氮奥氏体不锈钢微观组织及性能的影响[J].燕山大学学报,2013,(5):385-388,401,5.基金项目
国家自然科学基金资助项目 （）
