Volume 5, Issue 2, December 2019, Page: 30-38
New Measures for Prolonging the Nozzle Service Life
Yuan Changjun, Heze Guangxin Marine Parts & Fuel Injection Equipment Co., Ltd, Heze, People’s Republic of China
Liu Zongchang, Material and Metallurgy School, Inner Mongolia University of Science and Technology, Baotou, People’s Republic of China
Received: Nov. 9, 2019;       Accepted: Nov. 28, 2019;       Published: Dec. 10, 2019
DOI: 10.11648/j.fm.20190502.11      View  502      Downloads  95
Abstract
Microstructures of 27SiMnMoVA steel intended for nozzle in raw, as-brazed and as-normalized states were surveyed by using OLS4000 laser scanning confocal microscope, Axiovert-25CA optical microscope and QUENTA-400 scanning electron microscopy. It is found that the microstructures of raw 27SiMnMoVA steel are ferrite and pearlite; the microstructures of the as-brazed 27SiMnMoVA steel are ferrite, martensite, bainite and troostite; the microstructures of as-normalized 27SiMnMoVA steel are sorbite and bainite; and that the as-normalized microstructures are appreciably finer than the as-brazed microstructures. Adjusting the carburizing and hardening processes, a cryptocrystalline martensite provided with better wear-resistance is obtained in the case of 27SiMnMoVA steel specimen, and the effective hardened depth is increased from 0.48mm to 0.75mm. Retained austenite content and wear-resistance of the 27SiMnMoVA steel specimens in different heat treatment conditions were measured by means of D8 Advance X-ray diffractometer and MM200 Pin-on-Disk wear testing machine. The results show that the retained austenite contents in the specimens are six to eight percent, and the abrasion marks are as about 3mm. The volume and superficial area of the cooling chamber were increased by 13% and 23% respectively by the way of improving it’s structure, which made the cooling performance of the needle nozzle enhanced significantly. The purpose of increasing the flow coefficient of the nozzle spray holes, improving the spray quality and performance of the nozzle and prolonging the nozzle assembly service life were achieved by adopting liquid extrusion grinding process and carried out the liquid extrusion grinding in spray holes of the nozzle by using KYM-2 liquid extrusion grinder.
Keywords
27SiMnMoVA Steel, Nozzle, Retained Austenite, Effective Hardness Case, Wear Resistance, Liquid Extrusion Grinding, Flow Coefficient, Service Life
To cite this article
Yuan Changjun, Liu Zongchang, New Measures for Prolonging the Nozzle Service Life, Fluid Mechanics. Vol. 5, No. 2, 2019, pp. 30-38. doi: 10.11648/j.fm.20190502.11
Copyright
Copyright © 2019 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Reference
[1]
Chen Mao-tao. The Heavy Oil Burning Nozzle made by 18CrNi8 Heat-treatment Process Study [D]. Chongqing: Chongqing University of Technology, 2015.
[2]
Cheng Cai-he. An Aproach to Improvement on Service Life of the Fuel Injector for 16V240 ZB High-Power Diesel Engines [J]. Diesel Engine, 2001, (2): 16~21.
[3]
Huang Bin, He Zhi-rong, Xie Nian-suo, Cheng Feng. Study of the properties of steel of 20CrMoS used as needle-value of spry nozzle [J]. Journal of Shanxi Institute of Technology, 2001, 17 (3): 5~9.
[4]
Shao Li-dong, Chen Zong-ming, Lou Yi. Analysis of injector valve forehead broken expiration [J]. Mechanical & Electrical Engineering Magazine, 2007, 24 (4): 54~55.
[5]
Yuan Changjun, Liu Zongchang. Study on the Microstructures and Service Life of Nozzle [J]. Heat Treatment Technology and Equipment, 2015, 36 (2): 26~30.
[6]
Liu Zongchang, et al. Principle of Material Microstructure Transformation [M]. Beijing: Metallurgical Industry Press, 2006.
[7]
GB/T 13299-91, Steel-Determination of Microstructure [S].
[8]
Liu Zong-chang, Wang Yu-feng, Yang Hui, Zhao Ai-jun, Liu Hong-ju. The banding structure of forging-rolling bar of 42CrMo steel [J]. Journal of Baotou University of Iron and Technology, 2003, 22 (4): 323~326.
[9]
Liu Zong-chang. Quenching Crack of Steel Parts and Preventive Methods [M], 2nd edn. Beijing: Metallurgical Industry Press, 2008, 69~71.
[10]
Cui Zhongqi, Tan Yaochun. Metallography & Heat Treatment [M], 2nd edn. Harbin:China Machine Press, 2010, 178~179.
[11]
Bo Xin-tao, Guo Hai-yang, Yuan Feng-song. Practical Handbook of Heat Treatment [M]. Shanghai: Shanghai Science and Technology Press, 2009, 220.
[12]
GB/T 9450-2005, Steels-Determination and verification of the depth of carburized and hardened cases [S].
[13]
Hu Mingjuan, Pan Jiansheng. Principle of Chemical Heat Treatment of iron and steel [M]. shanghai: Shanghai Jiaotong University Press, 1996, 89~99.
[14]
Li Lin, Ma Maoyuan, Ji Shijun. Effects of Residual Austenite on Contact Fatigue Properties [J]. Ordnance Material Science And Engineering, 1990, (11): 60.
[15]
Xu Xiao-dan, Shao Hui-liang, Zhang Xiao-yu. The Wear Resistance of Retained Austenite [J]. Journal of Changchun University of Technology, 2003, 24 (4): 5.
[16]
Wang Zhongjun, Chen Jun. Application of High-speed Marine Diesel Engine Burned heavy Fuel Oil [J]. Ship & Ocean Engineering, 2010, 39 (2): 74-77.
[17]
Yu Wei. Research on Performance of High-Speed Marine Diesel Using Heavy Fuel Oil [D]. Wuhan: Wuhan University of Technology, 2011.
[18]
Ma Huiqing, Liu Li, Yang Xiaoning, et al. Research on Liquid extrusion Grinding in Two Lines Spray [J]. Modern Vehicle Power, 2011, (3): 41-43.
[19]
Yuan Changjun, Chen Changyu, Li Xinzhong. Analysis of Liquid Extrusion Grinding in Spray Hole and Assembly Test of Nozzle [J]. Modern Vehicle Power, 2019, (2): 43-46.
[20]
GB/T 5772-2010, Injector nozzle of diesel—Specifications [S].
Browse journals by subject