高氮钢构件机器人电弧增材成型试验
摘要本课题采用九轴协同双丝焊接系统，采用熔化极气体保护焊的方法，研究自制高氮钢焊丝、及与308不锈钢双送丝电弧增材制造构件的表面形貌、力学性能、显微组织等特点及影响因素。
首先通过高氮钢单道单层增材试验，确定合理的焊接工艺参数范围，成功焊接出两道十层增材件，并发现层高、熔宽、成形情况与焊接工艺参数的关系。硬度试验表明，增材成形件沿增材方向每经堆焊层硬度降低，且高氮钢增材件硬度高于高氮钢-不锈钢双丝增材件。拉伸试验表明，高氮钢增材件的抗拉强度比纯高氮钢母材低，高于高氮钢-不锈钢双丝增材件。高氮钢焊缝组织由奥氏体和δ铁素体组成，热影响区晶粒由于热输入量增加，较焊缝区晶粒更为粗大。87854
关键词 电弧增材制造 单层多道焊 高氮钢 力学性能 微观组织
毕业设计说明书外文摘要
Title High nitrogen steel arc robot increasing material forming
experiment
Abstract
This subject adopts nine axis collaborative double wire welding system, using the method of melting pole in gas protection welding, the self-made characteristics of high nitrogen steel wire, and 308 stainless steel double arc wire feed with the increasing material manufacturing component of the surface morphology, mechanical properties, microstructure and its influencing factors。
First by high nitrogen steel single pass gain material test, to determine the reasonable range of welding parameters, welding two ten storey increasing material, and found storey, weld width, forming and welding process parameters。 The hardness test showed that the hardness of the increasing material was decreased, and the hardness of high nitrogen steel was higher than that of high nitrogen steel and stainless steel。 Tensile tests show that the tensile strength of high nitrogen steel is lower than that of pure high nitrogen steel, which is higher than that of high nitrogen steel and stainless steel。 The weld microstructure of high nitrogen steel is composed of austenite and δ ferrite, and the grain size of the heat affected zone is larger than that of the weld zone due to the increase of heat input。
Keywords Wire Arc Additive Manufacture Single layer multi-pass welding High nitrogen steel Mechanical Property Microstructure
目 次
1 绪论 1
1。1 选题背景 1
1。1。1 电弧增材制造技术背景 1
1。1。2 高氮钢选题背景 1
1。2 研究技术现状 3
1。2。1电弧增材制造技术发展现状 3
1。2。2其他增材制造现状 3
1。3 高氮钢的应用现状 4
1。4 研究内容和意义 5
2 试验材料、设备、方法 9
2。1 试验材料 7
2。2 焊接设备 7
2。3 试验方法 9
2。3。1 焊接试验 9
2。3。2 金相分析 10
2。3。3 硬度试验 11
2。3。4 拉伸实验