DC53/42CrMo双金属复合材料的组织与性能

doi:10.13228/j.boyuan.issn1001-0963.20240169

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钢铁研究学报 ›› 2025, Vol. 37 ›› Issue (3) : 386-395. DOI: 10.13228/j.boyuan.issn1001-0963.20240169

材料研究

DC53/42CrMo双金属复合材料的组织与性能

张赛康¹, 曹玉龙^1,2, 张中心³, 马崇圣¹, 李光强^1,2

作者信息 +

Microstructure and properties of DC53/42CrMo bimetallic composites

ZHANG Saikang¹, CAO Yulong^1,2, ZHANG Zhongxin³, MA Chongsheng¹, LI Guangqiang^1,2

Author information +

文章历史 +

摘要

采用自制电渣重熔设备成功制备板状DC53/42CrMo复合铸坯,经过750 ℃退火处理后,采用OM、SEM、EBSD对其显微组织、成分、界面元素过渡进行研究,并对双金属复合界面处的力学性能进行表征。结果表明:所制备的DC53/42CrMo双金属复合铸坯无夹渣、无孔洞界面结合良好;复合界面处发生元素扩散,其中C元素由含量低的42CrMo侧向含量高的DC53侧发生上坡扩散,双金属液固复合的过程中42CrMo中C的活度远大于DC53;42CrMo侧为铁素体基体+片层状珠光体组织,42CrMo侧靠近结合界面处存在宽度约为100 μm的热影响区组织为铁素体,DC53侧存在宽度约为30 μm的元素扩散影响区,DC53侧为珠光体基体和未溶碳化物组成,复合材料的显微硬度从42CrMo向DC53呈先下降再上升趋势,42CrMo侧热影响区硬度最低,平均硬度为192.9HV;复合试样界面的平均抗拉强度为632.73 MPa,剪切强度为586.12 MPa,复合试样拉伸断裂位置位于42CrMo侧而非结合界面处,表明复合界面不是薄弱区,界面结合性能良好。探究了界面结构及性能之间的内在联系,为双金属复合刀圈的制备提供参考。

Abstract

The plate DC53/42CrMo composite casting billet was successfully prepared by electroslag remelting equipment. After annealing at 750 ℃, the microstructure, composition and interfacial element transition were studied by OM, SEM and EBSD, and the mechanical properties at the bimetal composite interface were characterized. The results show that the prepared DC53/42CrMo bimetallic composite casting billet has good bonding without slag inclusion and porosity. Element diffusion occurs at the composite interface, in which element C diffuses upslope from the 42CrMo side with low C content to the DC53 side with high C content. During the bimetallic liquid-solid recombination process, the activity of C in 42CrMo is much higher than that in DC53. On the 42CrMo side, there is a ferrite matrix + lamellar pearlite structure. On the 42CrMo side, there is a heat affected zone with a width of about 100 μm near the binding interface, and on the DC53 side, there is an element diffusion affected zone with a width of about 30 μm. The DC53 side is composed of pearlite matrix and undissolved carbide. The microhardness of the composite decreases first from 42CrMo to DC53, and then increases. The hardness of the heat-affected zone on the 42CrMo side is the lowest, with an average hardness of 192.9HV. The average tensile strength of the interface of the composite sample is 632.73 MPa and the shear strength is 586.12 MPa. The tensile fracture position of the composite sample is located at the 42CrMo side rather than the bonding interface, indicating that the bimetal interface is not a weak area and the interface bonding performance is good. The internal relationship between interface structure and properties was investigated, which provided reference for the preparation of bimetal composite cutter ring.

导出引用

张赛康, 曹玉龙, 张中心, 马崇圣, 李光强. DC53/42CrMo双金属复合材料的组织与性能[J]. 钢铁研究学报, 2025, 37(3): 386-395 https://doi.org/10.13228/j.boyuan.issn1001-0963.20240169

ZHANG Saikang, CAO Yulong, ZHANG Zhongxin, MA Chongsheng, LI Guangqiang. Microstructure and properties of DC53/42CrMo bimetallic composites[J]. Journal of Iron and Steel Research, 2025, 37(3): 386-395 https://doi.org/10.13228/j.boyuan.issn1001-0963.20240169

中图分类号： TF14

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