10CrNi3MoV高强钢水下激光熔化沉积成形及组织性能研究

Forming, Microstructure and Properties of 10CrNi3MoV High-Strength Steel by Underwater Laser Melting Deposition

摘要:

我国自主研发10CrNi3MoV高强钢，凭借其较高的强度、良好的韧性以及优异的抗爆性和耐腐蚀性能，成为制造潜艇耐压壳体的重要结构材料。本工作采用响应曲面法研究了激光功率、扫描速度及送丝速度对水下单道沉积层稀释率和沉积角的影响，得到了优化的水下单道沉积工艺参数。在此基础上，研究了水环境对单道沉积层成形、微观组织及显微硬度的影响。与陆上相比，由于水下激光熔化沉积过程的冷却速度更快，因此水下沉积层的沉积角较大，而稀释率较小。此外，水下沉积层的微观组织较为细小，导致水下沉积层的显微硬度较高。

Abstract:

China has independently developed 10CrNi3MoV high-strength steel, which has become a crucial structural material for manufacturing submarine pressure hulls due to its high strength, excellent toughness, superior explosion resistance, and outstanding corrosion resistance. In this study, the response surface method was used to investigate the effects of laser power, scanning speed, and wire feeding speed on the dilution rate and deposition angle of the underwater single-pass deposition layer. Then the optimized underwater single-pass deposition process parameters were obtained. Based on this, the influence of the water environment on the formation, microstructure, and microhardness of the single-pass deposition layer was investigated. Compared with that in air, the faster cooling rate in the underwater laser melting deposition process leads to a larger deposition angle and a slower dilution rate in the underwater deposition layer. Additionally, the microstructure of the underwater deposition layer is finer, which results in a higher microhardness.