应用小试样测试技术评估奥氏体不锈钢的蠕变行为。

Application of Small Specimen Test Technique to Evaluate Creep Behavior of Austenitic Stainless Steel.

作者信息

Yu Bintao, Han Wentuo, Tong Zhenfeng, Geng Diancheng, Wang Chenlong, Zhao Yingchao, Yang Wen

机构信息

China Institute of Atomic Energy, Beijing 102413, China.

School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China.

出版信息

Materials (Basel). 2019 Aug 9;12(16):2541. doi: 10.3390/ma12162541.

DOI:10.3390/ma12162541

PMID:31404993

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6720686/

Abstract

Small specimen test techniques (SSTT) are highly demanded in the nuclear field. In the present work, SSTT was applied to the creep tests of 15-15Ti austenitic steel. The creep behaviors of specimens with miniaturized and standard sizes were contrastively studied. The feasibility of SSTT is verified after tests under more than 20 creep conditions. The results that were obtained by miniaturized specimens are relatively conservative and they can be securely applied. The stress exponent and apparent activation creep energy of 15-15Ti are calculated as 7.7 and 428 kJ/mol, respectively. The creep microstructures are characterized by the evolution of dislocations, deformation twins, and precipitates.

摘要

小型试样测试技术（SSTT）在核领域有很高的需求。在当前工作中，SSTT被应用于15-15Ti奥氏体钢的蠕变试验。对小型尺寸和标准尺寸试样的蠕变行为进行了对比研究。在20多种蠕变条件下进行测试后，验证了SSTT的可行性。小型试样获得的结果相对保守，可安全应用。15-15Ti的应力指数和表观激活蠕变能分别计算为7.7和428 kJ/mol。蠕变微观结构的特征是位错、变形孪晶和析出物的演变。