中文摘要：

采用流场分析软件Fluent对煤粉管道弯头处进行模拟分析。结果表明：弯头处的失效形式主要为冲刷磨损,因此弯头内壁需具有足够的韧性和硬度。为加强弯头内壁的抗磨抗冲刷性能,配制了Ni55＋15%WC的Ni基复合粉末,对试样进行激光多道熔覆实验,观察了基体与熔覆层的结合情况,对熔覆层和45钢基材分别进行摩擦磨损实验和喷砂测试。结果表明,熔覆层组织致密,与基体成良好的冶金结合,熔覆层具有较高的耐摩擦磨损和冲刷磨损性能,实现了弯头内壁的强化。

英文摘要：

Flow field of pulverized coal piping was analyzed by software Fluent. Results indicate that elbow pipe inwall must have enough toughness and hardness because erosion wear is the dominant failure mode for it. In order to improve its wear-resistant, Ni55＋15%WC nickel-base composite powder was prepared and multi pass laser cladding experiments on test specimen were carried out. Combination between the base material and cladding layer was observed. Wear and abrasive blasting tests were experimented with cladding layer and 45 steel base material respectively. The results show that the microstructure of cladding layer is fine and close, and the cladding layer combines well with base material. The cladding layer has higher wear-resistant and strengthen the elbow pipe inwall.