铁素体钢材韧脆转变温度数值分析  

Numerical analysis of ductile brittle transition temperature of ferritic steel

作　　者：刘志伟[1,2] 刘聪 薛启超 LIU Zhiwei;LIU Cong;XUE Qichao(Nuclear Power Institute of China,Chengdu 610213,China;College of Aerospace and Civil Engineering,Harbin Engineering University,Harbin 150001,China)

机构地区：[1]中国核动力研究设计院,四川成都610213 [2]哈尔滨工程大学航天与建筑工程学院,黑龙江哈尔滨150001

出　　处：《应用科技》2021年第2期110-115,共6页Applied Science and Technology

基　　金：国家自然科学基金项目(51409056);黑龙江省自然科学基金项目(LH2020E070).

摘　　要：为确定铁素体钢材韧脆转变温度,基于夏比冲击试验对铁素体钢材的典型材料(低合金高强钢材Q345B)在韧脆转变区冲击吸收功的分布规律进行了研究。通过不同的断裂韧性求解方法(经验公式法和主曲线法)研究了Q345B钢参考温度T0的计算方法,最终得到基于经验公式及主曲线法的Q345B钢材断裂韧性随温度变化的曲线,并通过ABAQUS有限元软件模拟部分温度的夏比冲击吸收功,误差均在10%以内。结果表明:2种方法得到的断裂韧性-温度曲线,相应数据基本准确,所得数据能够反映材料的基本力学性能,相较于经验公式法,主曲线法更为简便,有限元模拟较为准确地反映出了真实的冲击情况。本文为材料和结构的完整性评估、相应结构的断裂韧性预测提供了研究基础。In order to determine the ductile brittle transition temperature of ferritic steel,based on the Charpy impact test,we studied the distribution law of impact absorption energy of a typical ferritic steel material(low-alloy highstrength steel Q345 B)in the ductile-brittle transition zone,and by different fracture toughness solution methods(empirical formula method and master curve method),studied the calculation method for the reference temperature T0 of Q345 B steel,and finally obtained the curve of Q345 B steel fracture toughness with temperature based on empirical formula and master curve method.By the finite element software ABAQUS,we simulated the Charpy shock absorption energy of part of the temperature,with the errors within 10%.The results show that the corresponding data of the fracture toughness-temperature curves obtained by these two methods are basically accurate,and the data obtained can reflect the basic mechanical properties of the material.Compared with the empirical formula method,the master curve method is simpler and the finite element simulation is more accurate in reflecting the real shock situation.This paper provides a research foundation for the integrity assessment of materials and structures,and the prediction of fracture toughness of corresponding structures.

关 键 词：断裂韧性 韧脆转变 夏比冲击 数值模拟 铁素体钢材 主曲线法 经验公式法 冲击吸收功 

分 类 号：O39[理学—工程力学]