Study on Microstructure and Properties of G20Mn5QT Cast Steel by Laser Cladding

CHEN Shuxiang; WU Yongshou; GUAN Yihui; ZHAO Yongsheng; LIU Yan; HAN Xiaohui

doi:10.7512/j.issn.1001-2303.2025.05.05

Important Issuse | Views : 0 下载量: 7 CSCD: 0

PDF
Export
Share
Collection
Album

Study on Microstructure and Properties of G20Mn5QT Cast Steel by Laser Cladding
Vol. 55, Issue 5, Pages: 37-47(2025)
Received：10 February 2025，

Revised：2025-03-07，

Published：20 May 2025
DOI： 10.7512/j.issn.1001-2303.2025.05.05
稿件说明：

移动端阅览

陈书翔，武永寿，管益辉，等.G20Mn5QT铸钢激光熔覆工艺与组织性能研究［J］.电焊机，2025，55（5）：37-47. DOI： 10.7512/j.issn.1001-2303.2025.05.05.

CHEN Shuxiang, WU Yongshou, GUAN Yihui, et al.Study on Microstructure and Properties of G20Mn5QT Cast Steel by Laser Cladding[J].Electric Welding Machine, 2025, 55(5): 37-47. DOI： 10.7512/j.issn.1001-2303.2025.05.05.

摘要

G20Mn5QT铸钢具有优良的力学性能，应用于轨道车辆的关键部件。然而，G20Mn5QT铸钢部件在服役过程中由于高频率振动接触可能会出现磨损、锈蚀而导致报废。传统的“以换代修”模式成本较高，亟需发展高效经济的修复技术。本研究采用激光熔覆修复技术，选用316L不锈钢粉末对G20Mn5QT铸钢部件的缺陷进行修复，通过单因素试验和正交试验，研究了激光功率、扫描速度和送粉率等工艺参数对熔覆层形貌、组织结构和力学性能的影响。研究发现，单道激光熔敷试样的熔宽和稀释率随着激光功率的增加而增加，熔高变化不大；而熔宽和熔高随扫描速度的增加而减小，稀释率没有明显的规律；熔高随着送粉率的增加而增大，而熔宽和稀释率随送粉率的提高而减小。熔覆层主要由面状晶、胞状晶、柱状晶和等轴晶组成。在适当的工艺参数下，熔覆层的硬度、耐磨性、拉伸性能、冲击韧性和剪切强度等性能与基体相近或优于基体，也表明316L不锈钢粉末可满足G20Mn5QT钢的修复要求。

Abstract

G20mn5QT cast steel has excellent mechanical properties and is applied to key components of railway vehicles. However

during service

G20Mn5QT cast steel component may suffer from wear and corrosion due to high-frequency vibration contact

leading to their scrapping. Laser cladding has the advantages of high energy density

low dilution rate

good interface bonding and small deformation. In order to reduce the cost

the laser cladding repair technology was used to repair the defects of G20Mn5QT cast steel parts with 316L stainless steel powder to improve the present situation of replacement repair. It is found that the melting width and dilution rate of the single-pass laser cladding sample increase with the increase of laser power

but the melting height and the melting width decrease with the increase of scanning speed

The dilution rate has no obvious rule

the melting height increases with the increase of powder feeding rate

while the melting width and dilution rate decrease with the increase of powder feeding rate. The cladding layer is mainly composed of planar

cellular

columnar and equiaxed grains. The hardness

wear resistance

tensile strength

impact toughness and shear strength of the cladding layer are close to or better than those of the matrix under appropriate technological parameters. it also shows that 316L stainless steel powder can meet the repair requirements of G20Mn5QT steel.

关键词

Keywords

references

Yin Y ， Ma T ， Han Q H ， et al . Material Parameters in the GTN Model for Ductile Fracture Simulation of G20Mn5QT Cast Steels ［J］. J. Mater. Civil. Eng. ， 2022 ， 34 （ 1 ）. DOI： 10.1061/（ASCE）MT.1943-5533.0004050 http://dx.doi.org/10.1061/（ASCE）MT.1943-5533.0004050 .

Zhang Z X ， Li Z W ， Wu H ， et al . Size and Shape Effects on Fatigue Behavior of G20Mn5QT Steel from Axle Box Bodies in High-Speed Trains ［J］. Metals ， 2022 ， 124 . DOI： 10.3390/met12040652 http://dx.doi.org/10.3390/met12040652 .

Zhang L J ， Yu P F ， Cheng H ， et al . Nanoindentation Creep Behavior of an Al0.3CoCrFeNi High-Entropy Alloy ［J］. Metall. Mater. Trans. A ， 2016 ， 47 （ 12 ）： 5871 - 5875 .

Hsu M C ， Wang C L ， Xu F ， et al . Direct immersogeometric fluid flow analysis using B-rep CAD models ［J］. Comput Aided Geom D ， 2016 ， 43 ： 143 - 158 .

Zhao X ， Yang H ， Cui Z ， et al . Enhanced photocatalytic performance of Ag-Bi4Ti3O12 nanocomposites prepared by a photocatalytic reduction method ［J］. Mater. Technol. ， 2017 ， 32 （ 14 ）： 870 - 880 .

Zhang M Y ， He S H ， Jiang B Y ， et al . The Study on Feasibility and Welding Characteristics of GMAW Surfacing Remanufacturing of H13 Steel Cutter Ring of TBM Hob ［J］. Coatings ， 2021 ， 11 （ 12 ）： 1559 .

Kutschmann P ， Grimm M ， Lindner T ， et al . Comparison of Aqueous and Gelled 3.5% NaCl Electrolytes for Assessing the Corrosion Resistance of Thermal Spray Stainless-Steel Coatings in Electrochemical Corrosion Tests ［J］. Coatings ， 2022 ， 12 （ 3 ）： 344 .

吕春雷，芮灿，电镀技术在机械备件修复中的生产应用［J］. 电镀与精饰， 2023 ， 45 （ 04 ）： 106 - 110 .

LV C L ， RUI C . Application of electroplating technology in the repair of mechanical spare parts Lyu ［J］. Plating & Finishing ， 2023 ， 45 （ 04 ）： 106 - 110 .

任建伟，崔启政，李宏然，等 . 涡轮导叶化学气相沉积渗铝熔覆层研究［J］. 热喷涂技术， 2022 ， 14 （ 04 ）： 42 - 47 .

REN J W ， CUI Q Z ， LI H R ， et al . Study of Chemical Vapor Deposition Aluminizing Coatings on Turbine Guide Blade ［J］. Thermal Spray Technology ， 2022 ， 14 （ 04 ）： 42 - 47 .

Kanyane L R ， Malepe T J ， Malatji N ， et al . Synthesis and Characterization of Al-SiC Composite Coatings on 316L Stainless Steel Fabricated via Laser Cladding Technique ［J］. Metallogr Microstruc ， 2021 ， 10 （ 5 ）： 601 - 609 .

Cai J ， Shi J M ， Wang K S ， et al . A modified parallel constitutive model for elevated temperature flow behavior of Ti-6Al-4V alloy based on multiple regression ［J］. Int. J. Mater. Res. ， 2017 ， 108 （ 7 ）： 527 - 541 .

叶超，侯亮，陈云，等 . 316L不锈钢激光熔覆宏微观特征优化［J］. 焊接学报， 2023 ， 44 （ 03 ）： 8 - 16+129 .

崔静，路梦柯，翟巍，等 . 300M钢激光熔覆316L不锈钢修复层组织及性能研究［J］. 激光与红外， 2021 ， 51 （ 06 ）： 710 - 719 .

Zhan M J ， Sun G F ， Wang Z D ， et al . Numerical and experimental investigation on laser metal deposition as repair technology for 316L stainless steel ［J］. Opt. Laser Technol. ， 2019 ， 118 ： 84 - 92 .

Sun G F ， Shen X T ， Wang Z D ， et al . Laser metal deposition as repair technology for 316L stainless steel： Influence of feeding powder compositions on microstructure and mechanical properties ［J］. Opt. Laser Technol . 2019 ， 109 ： 71 - 83 .

Liu W ， Wei H Y ， Liu A L ， et al . Multi-index co-evaluation of metal laser direct deposition： An investigation of energy input effect on energy efficiency and mechanical properties of 316l parts ［J］. J. Manuf. Process ， 2022 ， 76 ： 277 - 290 .

Song L J ， Zeng G C ， Xiao H ， et al . Repair of 304 stainless steel by laser cladding with 316L stainless steel powders followed by laser surface alloying with WC powders ［J］. J. Manuf. Process ， 2016 ， 24 ： 116 - 124 .

Xu G ， Wu L J ， Su Y Y ， et al . Microstructure and mechanical properties of directed energy deposited 316L/Ti6Al4V functionally graded materials via constant/gradient power ［J］. Mat. Sci. Eng. ， 2022 ， 839 ： 142870 .

Wang X L ， Muniz-Lerma J A ， Sanchez-Mata O ， et al . Microstructure and mechanical properties of stainless steel 316L vertical struts manufactured by laser powder bed fusion process ［J］. Mat. Sci. Eng. ， 2018 ， 736 ： 27 - 40 .

余俊 . 粉末冶金316L不锈钢的制备及性能研究［D］. 江苏：南京航空航天大学， 2012 .