Microstructure and Mechanical Properties of Dissimilar Steel Rail Gas Pressure Welded Joint

TANG Chong; DAI Hong; XIE Hang

doi:10.7512/j.issn.1001-2303.2022.12.03

Important Issuse | Views : 0 下载量: 17 CSCD: 0

PDF
Export
Share
Collection
Album

Microstructure and Mechanical Properties of Dissimilar Steel Rail Gas Pressure Welded Joint
Vol. 52, Issue 12, Pages: 28-35(2022)
DOI： 10.7512/j.issn.1001-2303.2022.12.03

扫描看全文

唐充，戴虹，谢航.异种钢轨气压焊接头的显微组织与力学性能［J］.电焊机，2022，52（12）：28-35.

TANG Chong, DAI Hong, XIE Hang.Microstructure and Mechanical Properties of Dissimilar Steel Rail Gas Pressure Welded Joint[J].Electric Welding Machine, 2022, 52(12): 28-35.
唐充，戴虹，谢航.异种钢轨气压焊接头的显微组织与力学性能［J］.电焊机，2022，52（12）：28-35. DOI： 10.7512/j.issn.1001-2303.2022.12.03.

TANG Chong, DAI Hong, XIE Hang.Microstructure and Mechanical Properties of Dissimilar Steel Rail Gas Pressure Welded Joint[J].Electric Welding Machine, 2022, 52(12): 28-35. DOI： 10.7512/j.issn.1001-2303.2022.12.03.

摘要

贝氏体钢轨的焊接性问题导致其应用被制约，为适应贝氏体钢轨在轨道铺设与维护工程中的应用发展趋势，采用气压焊方法研究贝氏体钢轨（U20Mn）与珠光体钢轨（U95Cr）异种钢轨的焊接性。通过光学显微镜（OM）、扫描电镜（SEM）、冲击和拉伸试验探索焊缝界面的微观组织形貌、元素扩散规律和力学性能。结果表明：贝氏体与珠光体异种钢轨焊接接头焊缝界面金属能在固态条件下形成共同晶粒，实现了良好的冶金结合，轨底脚相对其他部位结合程度较差；U20Mn侧焊缝区域主要由马氏体（66.2%）及贝氏体铁素体（33.8%）组成，最高硬度值为500 HB；接头冲击韧性较低，为4.1 J，抗拉强度为961 MPa，延伸率为8%，接头强度较U95CrWZ软化区更高。

Abstract

The application of bainite rail is restricted due to its weldability. In order to adapt to the application and development trend of bainite rail in track laying and maintenance engineering, the weldability of dissimilar steel welding between bainite rail and pearlite rail is studied by pneumatic welding method.The microstructure morphology, element diffusion law and mechanical properties of the weld interface were investigated by optical microscope (OM), scanning electron microscope (SEM), impact and tensile tests. The results show that the weld interface metal of dissimilar steel welded joints of bainite rail and pearlite rail can form common grains in solid state, which can achieve good metallurgical bonding, and the bonding degree of rail foot is poor compared with other parts. U20Mn WZ (U20Mn side weld) area is mainly composed of martensite (66.2%) and bainite ferrite (33.8%), and the highest hardness value is 500 HB; the impact toughness of the joint is 4.1 J; the tensile strength is 961 MPa ,and the elongation is 8%.

关键词

气压焊U20Mn/U95Cr异种钢焊接显微组织力学性能

Keywords

gas pressure weldingwelding of U20Mn / U95Cr dissimilar steelmicrostructuremechanical property

references

王俊. 重载铁路轨道技术发展方向研究［J］. 建筑技术开发，2019，46（04）：116-117.

WANG J. Research on Development Trend of Track Technology for Heavy Haul Railways［J］.Roads and

Bridges， 2019， 46（04）： 116-117.

谭谆礼，高博，高古辉，等.国内外贝氏体钢轨的研发现状［J］.金属热处理，2018，43（04）：10-18.

TAN Z L，GAO B，GAO G H，et al. Current development situation of bainitic rails at home and abroad［J］. Heat Treatment of Metals， 2018，43（04）：10-18.

张琪，李力，丁韦，等.国内外贝氏体钢轨焊接研究现状［J］.热加工工艺，2017，46（03）：16-18.

ZHANG Q， LI L ， DING W ， et al. Research Status on Welding of Bainite Steel Rail in China and Other Countries［J］. Hot Working Technology， 2017， 46（03）：16-18.

Kozyrev N A， Usoltsev A A， Kryukov R E， et al. Modern methods of rail welding［J］. Key Engineering Materials， 2017， 736：116-121.

Saita K， Karimine K， Ueda M， et al. Trends in rail welding technologies and our future approach［J］. Nippon steel &sumitomo metal technical report， 2013， 105： 84-92.

江明明，何柏林.钢轨焊接方法与焊接接头的质量控制研究［J］. 热加工工艺，2017，46（13）：7-10.

JIANG M M， HE B L.Investigation of Rail Welding Method and Quality Control of Welded Joint［J］. Hot Working Technology，2017，46（13）：7-10.

杜志光. U75钒钢轨固定式闪光焊接接头组织及性能研究［D］. 北京：北京交通大学，2016.

DU Z G. Research on the microstructures and properties of the stationary flashed welded joints of U75V rail［D］. Beijing：Beijing Jiaotong University，2016.

Heyder R， Girsch G. Testing of HSH： emoji： rails in high-speed tracks to minimise rail damage［J］. Wear， 2005，258（7-8）：1014-1021.

郑浩，戴虹，周世恒.U20Mn钢轨钢塑性压力焊界面行为特征研究［J］.电焊机，2019，49（02）：66-71.

ZHENG H， DAI H， ZHOU S H. Study on behavior characteristics of U20Mn steel rail plasti pressure welding［J］. Electric Welding Machine，2019，49（02）：66-71.

郑霄，戴虹.钢轨气压焊接头光斑缺陷研究［J］.材料导报，2021，35（14）：141.

ZHENG X， DAI H. Research on White Spot Defect of Rail Gas Pressure Welded Joint［J］. Materials Reports，2021，35（14）：141.

中国铁路局.TB/T 1632.4—2014 钢轨焊接第4部分：气压焊接［S］. 北京：中国铁道出版社，2015.

编辑部网址：http：//www.71dhj.comhttp://www.71dhj.com

Alert me when the article has been cited

提交

Comparison on the Microstructure and Mechanical Properties of CoCrFeMnNi High-entropy Alloys welded Joints by Laser Welding and Gas Tungsten Arc Welding