FV520B沉淀硬化不锈钢的MAG堆焊再制造力学特性

doi:10.11868/j.issn.1001-4381.2017.000433

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摘要

采用堆焊熔敷成形技术进行FV520B沉淀硬化不锈钢再制造实验，并通过与基材相应性能进行对比分析，研究FV520B不锈钢MAG堆焊再制造成形层力学特性。结果表明：FV520B不锈钢MAG堆焊再制造成形层具有高强度和高硬度特性，其抗拉强度达到1195MPa，超过基材的1092MPa，屈服强度和硬度平均值分别为776MPa和336HV，与基材的859MPa和353HV相近；但是，再制造成形层的静拉伸伸长率与冲击韧性相对较低，分别为8.72%和61J/cm²，与基材的19.67%和144J/cm²相比差距较大。试样断口和组织分析表明，MAG堆焊再制造成形层的快冷非平衡结晶板条马氏体+NbC，MoC，M₂₃C₆等碳化物沉淀强化相组织是其具有高强度和高硬度力学特性的根本原因。不过，缺少时效处理和Cu元素强化相作用，以及夹杂脆性相和大尺寸球形颗粒与基体间的弱界面作用会恶化材料受力时的变形能力，容易引起应力集中并开裂，是再制造成形层具有较低静拉伸伸长率和较差冲击韧性的主要原因。

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关键词 ： FV520B沉淀硬化不锈钢, 再制造, MAG堆焊, 力学性能

Abstract：

Surfacing deposition forming method was adopted to carry out remanufacturing experiment of FV520B precipitation hardening stainless steel. Then the mechanical property characteristic of the remanufacturing layer was tested and studied, contrasted with the corresponding property of substrate. The results show that the remanufacturing layer, formed with MAG surfacing of FV520B precipitation hardening stainless steel has mechanical characteristic with high strength and hardness, the tensile strength reaches 1195MPa, exceeds 1092MPa of substrate, yield strength is 776MPa and average hardness is 336HV, is close to the corresponding property of substrate which is 859MPa and 353HV respectively; however, the elongation and impact toughness of the remanufacturing layer is merely 8.92% and 61J/cm² respectively, it has a large gap with the corresponding property 19.72% and 144J/cm² respectively of substrate. Fracture and microstructure analysis on specimens shows that the microstructure of remanufacturing layer is fast cooling non-equilibrium crystallized lath martensite, and carbide precipitated strengthening phase such as NbC, MoC, M₂₃C₆, etc, which is the reason that remanufacturing layer has high strength and high hardness. But as lack of aging treatment and Cu strengthening phase, and the weak interface between contaminating brittle phase or large size spherical particles and substrate will deteriorate the deformability and induce stress concentration and cracking when the material is load-carrying, and is the main reason of the remanufacturing layer having lower static tensile elongation and impact toughness.

Key words： FV520B precipitation hardening stainless steel remanufacturing MAG surfacing mechanical property

收稿日期: 2017-04-15 出版日期: 2017-10-18

中图分类号:	TG117.1
	TG434

基金资助:国家自然科学基金资助项目(51405510);国家自然科学基金资助项目(51375492);国家自然科学基金资助项目(51575527)

通讯作者: 朱胜 E-mail: zusg@sohu.com550123310

作者简介: 朱胜(1964-), 男, 教授, 博导, 主要研究方向为机械工程和再制造, 联系地址:北京市丰台区杜家坎21号装甲兵工程学院装备再制造技术国防科技重点实验室(100072), E-mail:zusg@sohu.com550123310@qq.com

引用本文:

柳建, 朱胜, 蔡志海, 张平, 刘军, 秦航, 仝永刚. FV520B沉淀硬化不锈钢的MAG堆焊再制造力学特性[J]. 材料工程, 2017, 45(10): 23-31.
Jian LIU, Sheng ZHU, Zhi-hai CAI, Ping ZHANG, Jun LIU, Hang QIN, Yong-gang TONG. Mechanical Characteristic of Remanufacturing of FV520B Precipitation Hardening Stainless Steel Using MAG Surfacing Deposition. Journal of Materials Engineering, 2017, 45(10): 23-31.

链接本文:

http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2017.000433 或 http://jme.biam.ac.cn/CN/Y2017/V45/I10/23

Table 1 FV520B不锈钢基材及再制造丝材化学成分(质量分数/%)

Fig.1 层间正交交替堆积法示意图^[23]

Fig.2 拉伸试样尺寸设计和断后试样实物图
(a)试样尺寸设计；(b)断裂试样照片

Fig.3 冲击试样照片

Fig.4 硬度测试取点位置示意图

Table 2 再制造成形层与基材静拉伸性能

Table 3 再制造成形层与基材冲击韧性

Fig.5 再制造成形层沿高度方向硬度分布规律

Fig.6 再制造成形层与基材拉伸试样断口SEM照片
(a)成形层试样断口；(b)基材试样断口

Fig.7 再制造成形层与基材冲击试样断口SEM照片
(a)成形层试样断口；(b)基材试样断口

Fig.8 再制造成形层显微组织
(a)光学显微组织照片；(b)透射电镜照片

Fig.9 再制造成形层和基材XRD衍射谱
(a)再制造成形层；(b)基材

Fig.10 再制造成形层试样断口中的大尺寸球形颗粒
(a)静拉伸试样断口；(b)冲击试样断口

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