铸造2025，Vol.74Issue(12)：1606-1610,5.
矿山机械用机架前座裂纹分析及解决措施
Crack Analysis and Solutions for the Front Seat of the Rack for Mining Machinery
宋志起 1刘健明 1贾旭 1邹寅1
作者信息
- 1. 中车戚墅堰机车车辆工艺研究所股份有限公司,江苏 常州 213011||江苏朗锐茂达铸造有限公司,江苏江阴 214445
- 折叠
摘要
Abstract
Aiming for the cracks in the front seat of the rack for the mining machinery,the Zeiss microscope,field emission scanning electron microscope,and energy spectrometer are used to analyze the causes of the cracks.The results show that the decarburization layers exist on both sides of the crack.The crack is a hot tearing one produced during the solidification process of the casting and contains oxide inclusions.The dense bi-film with Fe2O3,MnO,Na2O,and CaO is the source of the crack.Analyzing the reason,it can be seen that during the solidification process of the steel liquid,the double-layer films wrapped with oxide inclusions penetrate from the surface layer into the interior of the steel liquid and converge between the grains.The contraction of the skeletons of dendrites are hindered by the sand cores or mold,resulting in shrinkage stress.At high temperature,when the concentrated strain at the position of the double-layer film cannot meet the shrinkage requirements of the alloy,cracks will occur in the weak areas with small thicknesses.Combined with the analysis of the microstructures and crack causes,improving the position and distribution of the ingates and feeders,deoxidizing by using of composite rare earth and refining alloys,strengthening the quality control of raw materials,improving the operators'skills,and strengthening slag control are effective ways to reduce the generation of hot tearing cracks.关键词
机架前座/裂纹/脱碳层/氧化夹杂物Key words
front seat of the rack/crack/decarburization layer/oxidation inclusions分类
矿业与冶金引用本文复制引用
宋志起,刘健明,贾旭,邹寅..矿山机械用机架前座裂纹分析及解决措施[J].铸造,2025,74(12):1606-1610,5.
