摘要
采用埋弧增材制造技术成功制造出了低碳钢厚壁构件,研究了厚壁构件的微观组织与力学性能。结果表明:厚壁构件的显微组织主要由细小的等轴铁素体晶粒基体和少量位于晶界上的珠光体构成,局部存在少量由多边形铁素体组织形成的窄条状区域。厚壁构件在水平和垂直方向的维氏硬度分别为151.3 HV10和149.9 HV10,抗拉强度分别为458.7 MPa和456.2 MPa,屈服强度分别为360.7 MPa和353.8 MPa,伸长率分别为33.67%和27.48%。表明除垂直方向的塑性指标略低外,其他的基本力学性能指标都基本呈各向同性。厚壁构件具有良好的低温冲击韧性,-60℃下厚壁构件水平和垂直方向的夏比冲击吸收能量分别为281 J和284 J,断口存在大而深的等轴韧窝。
Low carbon steel thick-walled component was successfully fabricated by submerged arc additive manufacturing technology,and microstructure and mechanical properties of the thick-walled component were studied.The results show that the microstructure of the thickwalled component is mainly composed of a matrix of fine equiaxed ferrite grain and a small amount of pearlite distributed on the grain boundary,and there are a small amount of narrow strip-shaped regions formed by polygonal ferrite structure in some parts.The Vickers hardness of the thick-walled component in horizontal and vertical directions are 151.3 HV10 and 149.9 HV10 respectively,the tensile strength is 458.7 MPa and 456.2 MPa respectively,the yield strength is 360.7 MPa and 353.8 MPa respectively,and the elongation is 33.67%and 27.48%respectively.It shows that except that the plasticity index in the vertical direction is slightly lower,the other basic mechanical properties are basically isotropic.The thick-walled component has good low-temperature impact toughness,at-60℃,the Charpy impact absorbed energy in the horizontal and vertical directions of the thick-walled component are 281 J and 284 J respectively,and there are large and deep equiaxed dimples on the fracture surface.
作者
董翼纶
李宇航
武少杰
程方杰
DONG Yi-lun;LI Yu-hang;WU Shao-jie;CHENG Fang-jie(School of Materials Science and Engineering,Tianjin University,Tianjin 300350,China;Tianjin Key Laboratory of Advanced Joining Technology,Tianjin 300350,China)
出处
《材料热处理学报》
CAS
CSCD
北大核心
2022年第2期87-93,共7页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金(51775372)。
关键词
埋弧增材制造
厚壁构件
微观组织
力学性能
submerged arc additive manufacturing
thick-walled component
microstructure
mechanical property
