摘要
利用电子万能试验机对316LN不锈钢在-40~300℃范围内进行单轴拉伸实验。借助扫描电镜(SEM)和透射电镜(TEM)对不锈钢拉伸变形后的组织及断口形貌进行系统分析,研究了温度和拉伸速度对316LN不锈钢组织与性能的影响规律。结果表明:在-40~300℃进行拉伸实验,强度指标随着温度的升高而降低,在25~300℃范围内,随着温度升高,伸长率降低,断口韧性断裂特征逐渐减弱,在-40^-20℃范围内,伸长率随着温度升高而增大,断口呈现韧性断裂特征;同一实验温度下(-20℃、300℃),随着拉伸速度的提高,强度指标增大,伸长率降低;在-40~300℃范围内,随着实验温度的降低,变形组织形态由位错缠结为主向形变孪晶为主发生转变。
Uniaxial tensile tests of 316 LN stainless steel at temperature of- 40-300 ℃ were carried out on an electronic universal testing machine.Microstructure and fracture surface of the austenitic stainless steel after the tensile deformation were analyzed by means of scanning electron microscopy（ SEM） and transmission electron microscopy（ TEM） and X-ray diffraction（ XRD）.Influence of temperature and tensile speed on the microstructure and mechanical properties of the 316 LN stainless steel was investigated.The results show that tensile strength of the steel decreases with the increasing temperature in the range of- 40 to 300 ℃; elongation decreases with the increasing temperature and the ductile fracture characteristics gradually weakenes in the range of 25℃ to 300℃; elongation increases with the increasing temperature and the fracture presents ductile fracture characteristics in the range of- 40 ℃ to- 20 ℃.At the same experiment temperatures（- 20 ℃,300 ℃）,with the increasing of tensile speed,the strength increases and the elongation decreases.Deformation microstructure changes from dislocation tangles dominant to deformation twins dominant with the decreasing tensile temperature in the range of- 40 ℃ to 300 ℃.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2016年第10期131-137,共7页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金(50801021
51201061)
河南省科技攻关计划项目(152102210077)
河南省高校科技创新人才支持计划项目(17HASTIT026)
河南省科技创新杰出人才支持计划项目(144200510009)
河南省教育厅科技计划项目(16A430005)
河南科技大学科技创新团队资助项目(2015XTD006)
