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| 35SiMn钢等离子堆焊不锈钢粉的组织及性能研究 |
| Microstructure and Properties of 35SiMn Steel Plasma Surfacing Welding Stainless Steel Powder |
| Received:December 27, 2019 Revised:January 10, 2020 |
| DOI：10.3969/j.issn.1674-6457.2020.01.002 |
| 中文关键词: 等离子堆焊 35SiMn 高硬度马氏体不锈钢 组织梯度 拉伸强度 |
| 英文关键词: plasma welding 35SiMn high hardness martensite stainless steel microstructure gradient tensile strength |
| 基金项目:国家重点研发计划（2018YFB1105800） |
| Author Name | Affiliation | | WANG Yi | State Key Laboratory of Mechanical Behavior for Materials, Xi'an Jiaotong University, Xi'an 710049, China | | LIU Yan | State Key Laboratory of Mechanical Behavior for Materials, Xi'an Jiaotong University, Xi'an 710049, China | | NIU Jing | State Key Laboratory of Mechanical Behavior for Materials, Xi'an Jiaotong University, Xi'an 710049, China | | ZHANG Jian-xun | State Key Laboratory of Mechanical Behavior for Materials, Xi'an Jiaotong University, Xi'an 710049, China |
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| 中文摘要: |
| 目的 采用等离子弧作热源在35SiMn钢表面进行高硬度马氏体不锈钢粉末的堆焊，分析堆焊件组织梯度及性能分布规律。方法 采用多木DML-V03BD等离子焊机及YASKAWA六轴机器人在35SiMn钢表面堆焊高硬度马氏体不锈钢。借助Nikon ECLIPSE MA200倒置显微镜观察堆焊件凝固组织形态，借助SU3500钨灯丝扫描电镜对元素分布进行表征，借助XRD-7000SSHIMADZU分析堆焊层的物相组成。采用INSTRON 1195电子拉伸试验机检测堆焊件的结合强度，采用HXD-1000TMC维氏硬度计检测堆焊件沉积方向的硬度分布。结果 在所选堆焊工艺下，沉积层主要由α-(Fe,Cr)相组成，晶粒内部为马氏体相。堆焊层的显微硬度在HV0.5500~HV0.5600之间波动，热影响区的硬度随着界面距离的变化而先增大后降低又增大，最低硬度降至HV0.5241。结论 堆焊接头拉伸试样断裂位置在热影响区，抗拉强度为960 MPa。当电流为130 A、焊枪移动速度为20 cm/min、送粉速率为20 r/min时，堆焊件的抗拉强度可达基材的87%。 |
| 英文摘要: |
| The paper aims to conduct surfacing welding of high hardness martensite stainless steel powder on the surface of 35SiMn steel with plasma arc as the heat source. DML-V03BD plasma welding machine and YASKAWA six-axis robot were used to conduct surfacing welding on 35SiMn high hardness martensite stainless steel. The solidification microstructure was observed with Nikon ECLIPSE MA200 inverted microscope; the element distribution was characterized with scanning electron microscope of SU3500 tungsten filament; and the phase composition was analyzed with XRD-7000SSHIMADZU. INSTRON 1195 electronic tensile testing machine was used to detect the bonding strength; and hxd-1000tmc vickers hardness tester was used to detect the hardness distribution in the deposition direction of the welding parts. The results showed that the sedimentary layer under the surfacing welding process was mainly composed of solid α-(Fe,Cr) phase, and martensitic phase was distributed inside the grain. The microhardness of the surfacing welding layer fluctuated between HV0.5500-HV0.5600; and the hardness of the heat-affected zone increased first and then decreased and increased again with the distance to the interface; and the minimum hardness droped to HV0.5241. The fracture location of the tensile sample of the joint is in the heat-affected zone, and the tensile strength is 960 MPa. When the current is 130 A, the moving speed of the welding torch is 20 cm/min, and the powder feeding rate is 20 r/min, the tensile strength of the surfacing weld can reach 87% of the base material. |
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