|
|
|
| Microstructure and wear resistance in laser cladding of NiAl based alloy |
| QU Yuebo1，LIU Zhenbo1，HAN Wei1，ZHAO Lin1，LI Changhai2，TIAN Zhiling1 |
| （1. Central Iron and Steel Research Institute, Beijing 100081, China; 2. Chalmers University of Technology,
Goteborg SE-412 96, Sweden） |
|
|
|
|
Abstract Laser cladding was carried out to prepare Ni3Al based alloy coatings on 45 steel by using Ni3Al/
25%Cr
3C2 mixed powder. Microstructure and wear resistance of the cladding materials was investigated. The
results indicate that the microstructure of the Ni
3Al based cladding materials contains mainly Ni3Al, NiAl, and in
situ-formed Cr
7C3. The hardness of the cladding materials is 599.6HV0.1, about 2.73 times of that of 45 steel.
Ni
3Al based cladding materials show sound wear resistance, owing to homogeneous distribution of fine Cr7C3.
The wear mechanism of the cladding materials is abrasive wear, and its friction coefficient is about 0.55. The spe‐
cific wear rate of the cladding materials is 1.12×10-5 mm3/N·m, only 28.6% of that of the vermicular graphite cast
iron.
|
|
Received: 05 July 2022
|
|
Corresponding Authors:
赵 琳（1977—），男，博士，教授，主要研究方向为焊接、激光加工和增材制造。
|
|
|
|
|
|
|
2022, Vol. 32 
