铸造技术2025，Vol.46Issue(11)：1075-1081,7.DOI:10.16410/j.issn1000-8365.2025.5083
柱塞泵缸体用LZQT600-3球铁型材碳氮共渗组织与性能研究
Research on the Carbo-nitriding Microstructure and Properties of LZQT600-3 Ductile Iron Dens Bars for Plunger Pump Cylinder
摘要
Abstract
A high-performance plunger pump,as the heart of hydraulic equipment,provides a prerequisite for safe and economical operation.Ultrahigh-pressure plunger pumps are thorn in the throat of China's equipment manufacturing industry.As a critical component of the plunger pump,achieving the localization of its material,securing superior manufacturing performance,and enabling cost control has become the paramount priority at present.Taking special horizontal continuous casting LZQT600-3 ductile iron dens bars for the plunger pump cylinder as the research object,the microstructure characteristics of different parts(surface,1/2R,center)were compared and analysed,and the carbonitriding parameters of the samples in different parts were optimized through orthogonal experiments.The results show that the spheroidization level and the number of graphite spheres decrease successively from the surface and 1/2R to the center of the dens bars,which are 554,509 and 492 per mm2,respectively;the average diameters of the graphite spheres are 29.86,26.78 and 31.03 μm,respectively;the quantities of pearlite in the matrix are 64.4％,65.9％and 70.8％;and the lamellar spacings of pearlite are 274,286 and 316 nm,respectively.The optimal carbonitriding parameter scheme obtained on the basis of the best wear resistance requirements of the plunger pump cylinder is 580 ℃×4 h,and the NH3∶CO2 ratio is 4∶3.The diffusion layer structure is composed of an oxide layer,a compound layer composed of the ε-Fe2-3(N,C)phase and γ'-Fe4N phase,and a diffusion layer composed of the α-Fe phase.关键词
水平连铸/柱塞泵缸体/LZQT600-3球铁型材/碳氮共渗/耐磨性能Key words
horizontal continuous casting/plunger pump cylinder/LZQT600-3 ductile iron dens bars/carbonitriding/wear resistance分类
矿业与冶金引用本文复制引用
吴虹燕,徐春杰,武迈,李润华,王若彤,刘丹凤,付依萍,许可..柱塞泵缸体用LZQT600-3球铁型材碳氮共渗组织与性能研究[J].铸造技术,2025,46(11):1075-1081,7.基金项目
陕西省科技成果转移与推广计划(2017CGZH-XNGJ-03) （2017CGZH-XNGJ-03）
陕西省国际科技合作计划重点项目(2023-GHZD-50) （2023-GHZD-50）
2025大学生创新创业训练计划 （）
