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Microstructure and Properties of Laser Additive Manufactured Fe-Cr-Ni-B Steel by Divided-area Process
Alternative Title基于分区成形激光增材制造一种Fe-Cr-Ni-B钢组织性能研究
Zhao YH(赵宇辉); Wang ZG(王志国); Zhao JB(赵吉宾); Shi F(施凡)
Department装备制造技术研究室
Source Publication稀有金属材料与工程
ISSN1002-185X
2018
Volume47Issue:8Pages:2305-2311
Indexed BySCI ; EI ; CSCD
EI Accession number20185106253621
WOS IDWOS:000444219500005
CSCD IDCSCD:6316211
Contribution Rank1
Funding OrganizationNational Key Research and Development Program of China
KeywordAdditive Manufacturing Divided-area Forming Process Microstructure Property Steel
Abstract

This paper presented a fundamental investigation on the formation mechanism and compatibility of microstructure/mechanical property of Fe-Cr-Ni-B steel samples, which were built by the divided-area forming and integral connection methods. Results indicate that the stress at the edge of the specimen produced in additive manufacturing is reduced by the divided-area forming and integral connection method. According to the microstructure analysis using stereology microscopy/optical microscopy/scanning electron microscope/X-ray diffractometer/Schaeffler diagram, the macrostructure is distributed in strip band geometry and the microstructures consist of dendrites with the intermetallic phases containing austenite phase, boride/matrix eutectic phase. Additionally, the macrostructure strips near the bonding line bend to the building direction and are discontinuous because of the unique forming method. However, the microstructures and composition of the samples are homogeneous. Due to the existence of boride and the finer microstructures, mechanical properties analysis shows that the alloy has high hardness, high ultimate strength and bad deformability. The hardness distribution is homogeneous apart from some positions of the re-melting zone and the heat-affected zone near the bonding line, which have a relatively lower hardness because of differences in microstructure.

Other Abstract采用分区成形+整体连接的方式可以有效改善增材制造零件边缘处应力。本工作选用一种含B合金钢作为研究对象,对分区成形该合金组织形成机理、成分变化及性能变化进行了研究,验证分区成形该合金的组织、性能相容性。结果表明,该成形方式制备的合金组织由条带分布的树枝晶组成,靠近搭接线位置处组织条带出现向生长方向弯曲,整体上而言分区成形不同位置处组织尺寸差异性较小,合金无宏观偏析。合金中组成相由基体相奥氏体相、分布于枝晶间的硼化物+基体相共晶相构成,共晶相形成导致枝晶偏析。性能分析表明,由于硼化物的存在和组织细小,导致合金硬度高、强度高、塑性差,在熔接区域附近显微硬度略低于其他区域,但差异性不大,整体硬度分布较为均匀。
Language英语
WOS SubjectMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS Keyword316l Stainless-steel ; Fabrication ; Behavior ; Powder
WOS Research AreaMaterials Science ; Metallurgy & Metallurgical Engineering
Funding ProjectNational Key Research and Development Program of China[2016YEB1100502]
Citation statistics
Document Type期刊论文
Identifierhttp://ir.sia.cn/handle/173321/22780
Collection智能产线与系统研究室
Corresponding AuthorWang ZG(王志国)
AffiliationShenyang Institute of Automation, Chinese Academy of Sciences, Shenyang 110016, China
Recommended Citation
GB/T 7714
Zhao YH,Wang ZG,Zhao JB,et al. Microstructure and Properties of Laser Additive Manufactured Fe-Cr-Ni-B Steel by Divided-area Process[J]. 稀有金属材料与工程,2018,47(8):2305-2311.
APA Zhao YH,Wang ZG,Zhao JB,&Shi F.(2018).Microstructure and Properties of Laser Additive Manufactured Fe-Cr-Ni-B Steel by Divided-area Process.稀有金属材料与工程,47(8),2305-2311.
MLA Zhao YH,et al."Microstructure and Properties of Laser Additive Manufactured Fe-Cr-Ni-B Steel by Divided-area Process".稀有金属材料与工程 47.8(2018):2305-2311.
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