11热输入对0Cr16Ni6合金激光熔覆修复层组织与性能的影响

范朝; 程宗辉; 张志强

doi:doi:10.14128/j.cnki.al.20234306.064

应用激光, 2023, 43 (6): 0064, 网络出版: 2024-02-02

11热输入对0Cr16Ni6合金激光熔覆修复层组织与性能的影响

Microstructures and Mechanical Properties of Laser Rapid Repaired 0Cr16Ni6 Alloy

论文大纲

范朝程宗辉张志强

作者单位

国营芜湖机械厂，安徽芜湖 241007

激光快速修复显微组织显微硬度激光热输入 laser rapid repair 0Cr16Ni6 0Cr16Ni6 microstructures microhardness laser heat input

摘要

针对0Cr16Ni6合金开展激光快速修复试验，利用光学显微镜(OM)和扫描电镜(SEM)，观察分析所得接头的接头显微组织构成，利用显微硬度计检测接头硬度。研究表明：激光快速修复0Cr16Ni6合金接头分为基体、热影响区以及熔覆区；随着激光热输入的增加，热影响区组织形貌变化不大，与基体相似，由块状铁素体、奥氏体及其上析出的碳化物和少量板条状马氏体组成，且与熔覆区存在明显的分界线；熔覆区顶部区域组织分布均匀，主要为树枝晶，熔覆区中部呈现树枝晶向柱状枝晶过渡的趋势，熔覆区下部为柱状枝晶，枝晶尺寸随着激光热输入的增加而增大；熔覆区主要由基体γ相、强化相γ′和γ′′相及沿枝晶边界析出的白色不规则相δ和MC相等组成；随激光热输入的逐渐增加，热影响区宽度D和深度H的变动不大，仅存在±0.05 mm以内的微小波动；熔宽d和熔高h逐渐增加；熔覆区平均硬度值随单位时间内热输入量的增加，呈现先增加后减小的趋势，且各区域显微硬度值排序为熔覆区＞基体＞热影响区。

Abstract

The laser rapid repair test for 0Cr1Ni6 alloy was carried out and optical microscope and scanning electron microscope were used to observe and analyze the microstructure of the joint. The joint hardness was tested by micro-hardness test. Studies showed that the joint of Laser rapid repairing 0Cr1Ni6 alloy was divided into matrix, heat affected zone and cladding zone. The morphology of the heat affected zone has little change with the increasing of laser heat input. Similar to the matrix, it is composed of massive ferrite, austenite, carbides precipitated on that and a small amount of lath martensite. There is an obvious boundary in the cladding zone. The microstructures are mainly dendrites at the top of the cladding area is evenly distributed.I In the middle of the cladding zone, dendrite transition to columnar dendrite is observed. The lower part of the cladding zone is columnar crystal. Dendrite size increases with the increasing of laser heat input. The cladding zone is mainly composed of matrix γ phase, enhanced γ'and γ"phases, and white irregular phases δ and MC precipitated along the dendrite boundary. With the laser heat input increases, the width (D) and depth (H) of the heat affected zone have little change, only have small fluctuation within ±0.05 mm, melting width d, and melting height h gradually increase. The average hardness of cladding zone increases with the heat input per unit time, showing a trend of first increasing and then decreasing. The order of micro-hardness is cladding zone > matrix > heat affected zone.

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范朝, 程宗辉, 张志强. 11热输入对0Cr16Ni6合金激光熔覆修复层组织与性能的影响[J]. 应用激光, 2023, 43(6): 0064. Fan Zhao, Cheng Zonghui, Zhang Zhiqiang. Microstructures and Mechanical Properties of Laser Rapid Repaired 0Cr16Ni6 Alloy[J]. APPLIED LASER, 2023, 43(6): 0064.

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