摘要
采用电弧熔丝增材制造(WAAM)技术进行多层单道结构2Cr13构件制备,揭示不同层间停留温度(110~550℃)下2Cr13电弧沉积件组织、性能各向异性演变规律,以实现关键工艺参数调控下力学性能主动控制。结果表明,550℃沉积件内针状马氏体因重熔碎晶呈细长外延状生长并具有略强织构取向,且于马氏体间隙处零散分布着很少量细小不规则逆变奥氏体。550℃沉积件因细晶强化获得了较高强度与硬度,但拉伸性能具有明显各向异性。110~180℃沉积件各区域间板条状马氏体虽大致沿沉积方向生长但无明显织构取向,马氏体晶粒因层间停留温度降低导致冷凝速率增加而略呈细化趋势。110~180℃沉积件因具有相近板条状马氏体组织,其力学性能较相近且呈各向同性。
2Cr13 martensite stainless steel has been widely used for the manufacturing of surgical tools and turbine blades. Contrary to the conventional fabrication technologies, there are several remarkable advantages in the fabrication of 2Cr13 parts by adopting wire arc additive manufacturing(WAAM)technologies, such as excellent metallurgical bonding, high production efficiency, near-net-shape production, and limited environmental contamination. In this work, the effect of interlayer dwelling temperature(110-550℃) on microstructural and mechanical properties has been revealed, providing a new approach for the active control of the performances of 2Cr13 buildups produced by wire-arc additive manufacturing.The part with a dwelling temperature of 550℃was featured by elongated acicular martensite features,with a slightly enhanced fiber-like texture, along with minor fine irregular-reverse austenite structures, dispersed among martensite gaps. This special martensitic distribution was mainly caused by the grain-broken effect under the intensive thermal shock from liquid melting pool. Consequently, the enhanced tensile strength and microhardness were obtained due to grain refinement, although exhibiting an obvious anisotropy in tensile properties. The parts with dwelling temperatures of 110-180℃ were characterized by relatively coarsened martensite laths, with a random texture type, within block-shaped ferrite matrix. The average martensite size was gradually refined due to the increased cooling rate by lowering interlayer temperature. The isotropic mechanical properties of all three parts(110-180℃) were similar because of the similar martensite laths.
作者
葛进国
卢照
何思亮
孙妍
殷硕
GE Jinguo;LU Zhao;HE Siliang;SUN Yan;YIN Shuo(School of Mechanical and Electrical Engineering,GuilinUniversityof ElectronicTechnology,Guilin541010,China;Trinity College Dublin,The University ofDublin,Dublin D02PN40,Ireland;School ofMalerials Science and Engineering,Guilin Universily ofElectronic Technology,Guilin 541010,China;Design&Research Insritute,Dalian Shipbuilding Industry Co.,Ltd,Dalian 116005,China;School of Mechanical Engineering,Yangzhou University,Yangzhou 225127,China)
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2023年第1期157-168,共12页
Acta Metallurgica Sinica
基金
中国博士后科学基金面上项目No.2021M693230
广西自然科学基金青年项目No.2021JJB160022
