激光与光电子学进展, 2012, 49 (1): 011402, 网络出版: 2011-10-21   

激光快速成形304不锈钢试件组织与拉伸断口特性分析

Analysis on Microstructure and Tensile Fracture Characteristic of 304 Stainless Steel Specimens Made by Laser Rapid Forming
作者单位
南华大学机械工程学院, 湖南 衡阳 421001
摘要
用激光快速成形(LRF)技术制备304不锈钢拉伸试样,并对试样进行拉伸。利用光学显微镜观察了试样表面显微组织;利用扫描电镜(SEM)观察了试样断口的形貌特征,并用能谱仪(EDS)分析了取样点处的化学成分。结果表明,所制备试样显微组织晶粒细小,具有定向凝固的特征,在成形件内部存在微细观孔洞与裂纹。在拉伸断裂试样中,断口呈现韧性断裂的特征,断口部分区间氧、硅含量较高,形成金属化合物夹杂,使材料的力学性能变差。
Abstract
With the technique of laser rapid forming (LRF), tensile samples of 304 stainless steel are prepared, on which tensile test is done. The surface is observed by optical microscope, the fracture morphology of the specimens is observed by scanning electronic microscopy (SEM), and chemical compositions of sampling points are analyzed by energy dispersive spectrometer (EDS). The results show that the sample′s microstructure contains small grains with unidirectional solidification characteristic, which form micro-holes and micro-cracks inside the formed parts. In specimens of tensile fracture, there are ductile fracture characteristics, and the contents of oxygen and silicon in some area of fracture surface are higher. These worsen the mechanical properties of the specimens.
参考文献

[1] 姬生钦, 李鹏, 曾晓雁. 激光熔覆直接制造金属零件的组织及力学性能分析[J]. 激光技术, 2006, 30(2): 130~132

    Ji Shengqin, Li Peng, Zeng Xiaoyan. Microstructure and mechanical property analyses of the metal parts direct fabricated by laser cladding[J]. Laser Technology,2006, 30(2): 130~132

[2] Xue Chunfang, Dai Yao, Tian Xinli. Laser engineered net shaping of Co-based superalloys[J]. Transaction of Nonferrous Metals Society of China, 2006, 16(23): s1982~s1985

[3] M. Gaumann, C. Bezencon, P. Canalis et al.. Single-crystal laser deposition of superalloys: processing-microstructure map[J]. Acta Mater., 2001, 49(6): 1051~1062

[4] 李鹏. 基于激光熔覆的三维金属零件激光直接制造技术研究[D]. 武汉: 华中科技大学, 2005

    Li Peng. Direct Laser Fabrication of 3-Dimentional Metal Parts Based on Laser Cladding[D]. Wuhan: Huazhong University of Science and Technology, 2005

[5] 贾文鹏, 林鑫, 陈静 等. 空心叶片激光快速成形过程的温度/应力场数值模拟[J]. 中国激光, 2007, 34(9): 1308~1322

    Jia Wenpeng, Lin Xin, Chen Jing et al.. Temperature/stress field numerical simulation of hollow blade produced by laser rapid forming[J]. Chinese J. Lasers, 2007, 34(9): 1308~1322

[6] 王华明, 张凌云, 李安 等. 先进材料与高性能零件快速凝固激光加工研究进展[J]. 世界科技研究与发展, 2004, 26(3): 27~31

    Wang Huaming, Zhang Lingyun, Li An et al.. Process on rapid solidification laser processing for advanced materials and components[J]. World Sci-Tech R&D, 2004, 26(3): 27~31

[7] 杨健, 黄卫东, 陈静 等. 激光快速成形金属零件的残余应力[J]. 应用激光, 2004, 24(1): 5~8

    Yang Jian, Huang Weidong, Chen Jing et al.. Residual stress of laser rapid formed metal parts[J]. Applied Laser, 2004, 24(1): 5~8

[8] A. Plati. Residual stress generation during laser cladding of steel with a particulate metal matrix composite[J]. Advanced Engineering Materials, 2006, 8(7): 619~623

[9] U. de Oliveira. Microstresses and microstructure in thick cobalt-based laser deposited coating[J]. Surface and Coatings Technology, 2007, 201(14): 6363~7124

[10] 昝林, 陈静, 林鑫 等. 激光快速成形TC21钛合金沉积态组织研究 [J]. 稀有金属材料与工程, 2007, 36(4): 612~616

    Zan Lin, Chen Jing, Lin Xin et al.. Research on microstructures of deposited TC21 titanium alloy by laser rapid forming[J]. Rare Metal Materials and Engineering, 2007, 36(4): 612~616

[11] X. H. Wu, J. Liang, J. Mei et al.. Microstructures of laser-deposited Ti-6Al-4V[J]. Materials and Design, 2004, 25(2): 137~144

[12] 陈静, 林鑫, 王涛 等. 316L不锈钢激光快速成形过程中熔覆层的热裂机理[J]. 稀有金属材料与工程, 2003, 32(3): 183~186

    Chen Jing, Lin Xin, Wang Tao et al.. Hot tearing mechanism of 316L stainless steel cladding layers in process of laser rapid forming[J]. Rare Metal Materials and Engineering, 2003, 32(3): 183~186

[13] 宋建丽, 邓琦林, 胡德金 等. 激光熔覆成形316L不锈钢组织的特征与性能[J]. 中国激光, 2005, 32(10): 1441~1444

    Song Jianli, Deng Qilin, Hu Dejin et al.. Organization characteristics and performance of 316L stainless steel by laser cladding forming[J]. Chinese J. Lasers, 2005, 32(10): 1441~1444

余金水, 邱长军, 周炬, 何彬, 樊湘芳. 激光快速成形304不锈钢试件组织与拉伸断口特性分析[J]. 激光与光电子学进展, 2012, 49(1): 011402. Yu Jinshui, Qiu Changjun, Zhou Ju, He Bin, Fan Xiangfang. Analysis on Microstructure and Tensile Fracture Characteristic of 304 Stainless Steel Specimens Made by Laser Rapid Forming[J]. Laser & Optoelectronics Progress, 2012, 49(1): 011402.

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