Microstructure and properties of laser carbon alloyed layer on 45 steel surface

doi:10.13251/j.issn.0254-6051.2021.10.043

Abstract

Abstract: Carbon alloyed layer was prepared on the surface of 45 steel by laser alloying process. The microstructure and properties of the alloyed layer under the optimal process were studied by means of OM, XRD and microhardness tester. The microstructure characteristics and efficiency of gas carburizing and laser carbon alloying were compared. The results show that the effect of each parameter on hardness of the alloyed layer is as follows: laser power > lap rate > scanning speed. With the increase of laser power, scanning speed and lap rate, the hardness of the alloyed layer increases first and then decreases. When the laser power is 1.5 kW, the scanning speed is 500 mm/min and the lap rate is 40%, the hardness of the alloyed layer is the highest, the thickness of alloyed layer is capable of reaching 600 μm, the microstructure is composed of acicular martensite, carbide (M₇C₃, Fe₃C) and a small amount of residual austenite, and the average hardness is about 617 HV0.3, the thickness of HAZ is 400 μm, microstructure is composed of martensite and retained austenite, and the average hardness is about 432 HV0.3, the microstructure of matrix is composed of ferrite and pearlite, the hardness is about 201 HV0.3. Compared with the traditional gas carburizing process, laser carbon alloying has the advantages of fine structure, high efficiency, green and environmental protection. It is an important development direction in the future.

Key words: laser alloying, orthogonal experiment, alloyed layer, carburizing, microhardness

CLC Number:

TG174.4

Li Haitao, Zhang Leitao, Xia Huiyun, Dai Jiaoyan, Xu Jinfu. Microstructure and properties of laser carbon alloyed layer on 45 steel surface[J]. Heat Treatment of Metals, 2021, 46(10): 237-241.

References

[1]Verezub N A, Prostomolotov A I. Mechanics of growing and heat treatment processes of monocrystalline silicon[J]. Mechanics of Solids, 2020, 55(5): 643-653.
[2]Xiao Y Y, Meng Y, Gao H, et al. Flexible perovskite solar cells fabricated by a gradient heat treatment process[J]. Sustainable Energy and Fuels, 2020, 4(2): 824-831.
[3]Luo R, Chen N, Xiong H, et al. Microhomogeneous WC-TiC-Co composite powders with enhanced sinterability via a two-step carburization method[J]. International Journal of Refractory Metals and Hard Materials, 2020, 95(2): 105413.
[4]周洪刚, 朱旭, 刘克, 等. 17Cr2Ni2MoVNb钢的渗碳淬火工艺[J]. 金属热处理, 2019, 44(10): 117-121.
Zhou Honggang, Zhu Xu, Liu Ke, et al. Carburizing and quenching process of 17Cr2Ni2MoVNb steel[J]. Heat Treatment of Metals, 2019, 44(10): 117-121.
[5]赵步青, 朱敏, 高旭华, 等. 气体渗碳的常见缺陷和预防措施[J]. 热处理, 2020, 35(2): 48-50.
Zhao Buqing, Zhu Min, Gao Xuhua, et al. Common defects for gas carburizing and preventive measures[J]. Heat Treatment, 2020, 35(2): 48-50.
[6]蒋秋娥, 莫竞芳, 宋海峰, 等. 12CrNi3等低合金渗碳材料热处理工艺研究[J]. 新技术新工艺, 2017(9): 76-78.
Jiang Qiu'e, Mo Jingfang, Song Haifeng, et al. Research on heat treatment technology for low-alloy carburizing material such as 12CrNi3[J]. New Technology and New Process, 2017(9): 76-78.
[7]Yan Bangcheng, Tan Ji, Wang Donghui, et al. Surface alloyed Ti-Zr layer constructed on titanium by Zr ion implantation for improving physicochemical and osteogenic properties[J]. Progress in Natural Science: Materials International, 2020, 30(5): 635-641.
[8]Bonek Mirosław, Tillová Eva. Tribological characteristic of tool steel surface layer alloyed using laser[J]. Solid State Phenomena, 2020, 308: 110-118.
[9]林基辉, 李耀, 郭栋, 等. 45钢激光表面铬合金化的制备工艺[J]. 金属热处理, 2018, 43(12): 170-173.
Lin Jihui, Li Yao, Guo Dong, et al. Preparation process of 45 steel laser surface chromium alloying[J]. Heat Treatment of Metals, 2018, 43(12): 170-173.
[10]刘德鑫, 张红星, 张蕾涛, 等. 45钢激光合金化Mo₁B₉Cr_x涂层的组织及性能[J]. 金属热处理, 2020, 45(9): 149-154.
Liu Dexin, Zhang Hongxing, Zhang Leitao, et al. Microstructure and properties of laser alloyed Mo₁B₉Cr_x coating on 45 steel[J]. Heat Treatment of Metals, 2020, 45(9): 149-154.
[11]管旺旺, 朱红梅, 朱卫华, 等. 锆合金表面激光渗碳组织和性能研究[J]. 装备制造技术, 2019(11): 103-105.
Guan Wangwang, Zhu Hongmei, Zhu Weihua, et al. Microstructure and properties of zirconium alloy by laser surface carburizing[J]. Equipment Manufacturing Technology, 2019(11): 103-105.
[12]Liu H, Li M, Qin X, et al. Numerical simulation and experimental analysis of wide-beam laser cladding[J]. The International Journal of Advanced Manufacturing Technology, 2019, 100: 237-249.
[13]Ma P, Wu Y, Zhang P, et al. Solidification prediction of laser cladding 316L by the finite element simulation[J]. The International Journal of Advanced Manufacturing Technology, 2019, 103: 957-969.
[14]王雪艳. 叶片用316L不锈钢表面激光合金化铬涂层性能及参数优化[J]. 真空科学与技术学报, 2019, 39(9): 791-795.
Wang Xueyan. Synthesis and characterization of laser-ablated Cr-alloy coatings on 316L stainless steel[J]. Chinese Journal of Vacuum Science and Technology, 2019, 39(9): 791-795.
[15]谭友宏, 刘敏, 马文有. 工艺参数对60CrMnMo钢表面激光陶瓷合金化涂层组织与硬度的影响[J]. 热加工工艺, 2012, 41(16): 154-157, 223.
Tan Youhong, Liu Min, Ma Wenyou. Effect of processing parameters on microstructure and microhardness of laser alloying 60CrMnMo steel with ceramics[J]. Hot Working Technology, 2012, 41(16): 154-157, 223.
[16]Lin C H, Duh J G, Yeh J W. Multi-component nitride coatings derived from Ti-Al-Cr-Si-V target in RF magnetron sputter[J]. Surface and Coatings Technology, 2007, 201(14): 6304-6308.
[17]Tariq N H, Naeem M, Hasan B A, et al. Effect of W and Zr on structural, thermal and magnetic properties of AlCoCrCuFeNi high entropy alloy[J]. Journal of Alloys and Compounds, 2013, 556: 79-85.
[18]Michał Kulka, Daria Mikołajczak, Natalia Makuch, et al. Laser surface alloying of austenitic 316L steel with boron and some metallic elements: Microstructure[J]. Materials, 2020, 13(21): 4852.
[19]李锋, 王新宇, 李世键, 等. 18Cr2Ni4WA钢衬套的精密气体渗碳淬火热处理[J]. 金属热处理, 2016, 41(4): 154-157.
Li Feng, Wang Xinyu, Li Shijian, et al. Precise gas carburizing quenching process of 18Cr2Ni4WA steel bushes[J]. Heat Treatment of Metals, 2016, 41(4): 154-157.