| 摘要: |
| 采用脉冲TIG焊马氏体时效钢金属粉芯焊丝堆焊铝合金压铸模表面来提高模具表面性能。利用SEM、TEM和XRD对堆焊层的微观组织和相特点进行分析。结果表明,堆焊层金属在时效处理后利用低碳马氏体基体上沉淀析出的金属间化合物(Ni3Ti、Ni3(Al,Ti))强化,得到较高硬度和强度,兼具一定韧性的耐疲劳堆焊层,发现还析出(Ni2.9Fe0.1)Ti、(Ni0.7Fe0.3)Al相。与18Ni马氏体时效钢和H13钢实心焊丝进行抗热疲劳试验对比,测试热循环作用下的硬度变化、产生热疲劳裂纹的热循环次数及热裂纹扩展速率,结果显示金属粉芯焊丝堆焊层具有较高的抗热疲劳性能。 |
| 关键词: 脉冲TIG焊 马氏体时效钢 金属粉芯焊丝 金属间化合物 热疲劳抗力 |
| DOI： |
| 分类号: |
| 基金项目: |
|
| Properties of maraging steel hardfacing metal deposited by metal powder-cored wire |
|
FANG Jian-jun, LI Zhuo-xin, WEI Qi, HU Qiang
|
|
School of Mechanics and Electrical Engineering, Beijing University of Technology, Beijing 100022, China
|
| Abstract: |
| Hardfacing material of maraging steel metal powder-cored wire was deposited by pulse TIG on aluminum die cast dies to improve the dies'properties and extend its service life.Microstructure and phase characteristics were analyzed by using SEM,TEM and XRD.After aging,the metal got super-high strength,hardness and thermal fatigue resistance by intermetallic compound[Ni3Ti,Ni3(Al,Ti)]precipitating in Fe matrix.Metastable phases such as,(Ni2.9Fe0.1) Ti and,(Ni0.7Fe0.3) were found.Thermal fatigue experimental results showed that maraging steel deposited by metal-cored wire has higher thermal fatigue resistance properties than that of H13 solid wire and 18Ni maraging steel. |
| Key words: pulse tungsten inert-gas welding maraging steel metal powder-cored wire intermetallic compound thermal fatigue resistance |
