太原理工大学学报2013，Vol.44Issue(1)：71-75,5.
大型LNG低温储罐用9Ni钢服役过程中组织性能变化研究
Investigation on Microstructure and Mechanical Properties of 9Ni Steel for LNG Storage Tank during Service
摘要
Abstract
In this paper, the change of microstructure and mechanical properties of 9Ni steel was studied after multiple Room temperature (25 ℃)←→deep cryogenics( - 196 ℃) insulation cycle treatment. OM and SEM were used to characterrizate the microstructure of materials;Low-temperature impact testing machine, universal electronic tensile testing machine and Rockwell hardness meter were used to test the low impact energy,tensile properties and hardness of the materials; And X-ray diffraction was used to calculate retained austenite content in 9Ni steel. The results show that the strength and low temperature toughness of 9Ni steel after insulation cycle treatment were improved to a higher level than those of untreated material. During the insulation cycle treatment,there were two factors for the improvement of mechanical properties of 9Ni steel: the transformation of reversed austenite into twinned martensite, which became the strengthing phase,and the relaxation of organizational stress and macroscopic stress.关键词
9Ni钢/低温韧性/逆转奥氏体Key words
9Ni steel/ low-temperature toughness/ reversed austenite分类
矿业与冶金引用本文复制引用
李建民,王沛占,刘东风,侯利锋,卫英慧..大型LNG低温储罐用9Ni钢服役过程中组织性能变化研究[J].太原理工大学学报,2013,44(1):71-75,5.基金项目
国家自然科学基金资助项目(51001079,21201129) （51001079,21201129）
高等学校博士点专项科研基金(20091402110010) （20091402110010）
中国博士后科学基金(20100471586) （20100471586）
山西省自然科学基金(2011011020-2,2010021023-1) （2011011020-2,2010021023-1）
