应用激光, 2020, 40 (1): 22, 网络出版: 2020-05-27   

2Cr12NiMoWV钢表面激光熔覆铁基合金组织及力学性能研究

Microstructure and Mechanical Properties of Laser Clad Iron-Based Alloy on 2Cr12NiMoWV Steel Surface
作者单位
1 南华大学机械工程学院, 湖南 衡阳 421001
2 衡阳中钢衡重设备有限公司, 湖南 衡阳 421001
摘要
为了提高冶金关键零部件热轧地下卷取机卷筒扇形板的力学性能并延长其使用寿命, 使用激光熔覆技术在2Cr12NiMoWV钢表面分别制备了两种铁基合金熔覆层; 利用金相显微镜观察熔覆层的显微组织; 利用显微硬度计测试熔覆层的硬度; 利用万能力学试验机测试熔覆层的力学性能; 利用SEM观察拉伸断口的显微组织; 利用EDS对断口的元素种类与含量进行分析。试验结果表明: 两种铁基合金熔覆层表面光滑平整, 无裂纹、气孔等明显缺陷, 均与基体钢形成了良好的冶金结合; 熔覆层的界面组织呈现定向快速凝固特征。其中A粉末制得的激光熔覆层硬度整体高于基体, 抗拉强度1 030 MPa, 屈服强度812 MPa, 延伸率10.1%, 断口形貌表明其断裂机制为脆性断裂; B粉末制得的激光熔覆层硬度整体略低于基体, 抗拉强度895 MPa, 屈服强度512 MPa, 延伸率26.5%, 断口形貌呈现出大量的韧窝, 断裂机制为韧性断裂。A粉末的激光熔覆组织硬度高、强度大, 塑性较差, B粉末的激光熔覆组织硬度较低、强度较差, 塑性极好。
Abstract
To improve the mechanical properties of the hot rolled underground coiler reel fan-shaped plate of metallurgical key components and prolong its service life, two kinds of iron-based alloy cladding layers were prepared on the surface of 2Cr12NiMoWV steel by laser cladding technique.Observing the microstructure of the cladding layer using a metallographic microscope; testing the hardness of the cladding layer using a microhardness tester;The mechanical properties of the cladding layer were tested by a universal testing machine. The microstructure of the tensile fracture was observed by SEM. The element types and contents of the fracture were analyzed by EDS.The test results show that the surface of the two iron-based alloy cladding layers is smooth and flat, and there are no obvious defects such as cracks and pores, which form a good metallurgical bond with the base steel.The interfacial organization of the cladding layer exhibits a directional rapid solidification feature.The hardness of the laser cladding layer prepared by A powder is higher than that of the matrix, the tensile strength is 1030MPa, the yield strength is 812MPa, and the elongation is 10.1%. The fracture morphology indicates that the fracture mechanism is brittle fracture.The hardness of the laser cladding layer prepared by B powder is slightly lower than that of the matrix. The tensile strength is 895 MPa, the yield strength is 512 MPa, and the elongation is 26.5%. The fracture morphology shows a large number of dimples, and the fracture mechanism is ductile fracture. The laser cladding of A powder has high hardness, high strength and poor plasticity. The laser cladding of B powder has low hardness and poor strength, but the plasticity is excellent.

杨振, 柳宁, 樊湘芳, 李勇, 邱长军. 2Cr12NiMoWV钢表面激光熔覆铁基合金组织及力学性能研究[J]. 应用激光, 2020, 40(1): 22. Yang Zhen, Fan Xiangfang, Qiu Changjun, Li Yong, Liu Ning. Microstructure and Mechanical Properties of Laser Clad Iron-Based Alloy on 2Cr12NiMoWV Steel Surface[J]. APPLIED LASER, 2020, 40(1): 22.

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