探讨了一种固态储氢装置的制造技术,且主要对罐体中异构材料焊接难点进行分析。首先,研究了不同参数下激光填丝焊接S30408异构材料(网状、块状)的焊接接头结构、形貌及力学性能差异,随后选取最优焊接参数焊接罐体内部,最后对单罐、整罐...探讨了一种固态储氢装置的制造技术,且主要对罐体中异构材料焊接难点进行分析。首先,研究了不同参数下激光填丝焊接S30408异构材料(网状、块状)的焊接接头结构、形貌及力学性能差异,随后选取最优焊接参数焊接罐体内部,最后对单罐、整罐及水箱进行气密性和无损检测试验。结果表明,在激光功率为450 W和焊接速度35 mm min下,获得了无缺陷的异构材料焊接接头。与其他参数相比,焊接速度为35 mm min时,获得了无缺陷的焊接接头且拉伸强度与断后伸长率达到了最高,分别为165.3 MPa和5.51%。单个与整体罐体的气密性与整体无损检测达到设计标准。展开更多
Difficulties in the geometric and performance control of wire laser additive manufacturing have hindered its widespread application.In this study,an in situ process monitoring system that combines a machine vision-bas...Difficulties in the geometric and performance control of wire laser additive manufacturing have hindered its widespread application.In this study,an in situ process monitoring system that combines a machine vision-based interlayer height controller(IHC)and P-controller-based melt pool temperature controller(MTC)was developed to improve the vertical dimensional accuracy and mechanical properties of off-axis fine-wire laser-directed energy deposition(OAFW-LDED)for 316 L thin-walled parts.The IHC effectively mitigates external defect inheritance,while its synergy with the MTC ensures process stability,improving the vertical dimensional accuracy to±0.2 mm.Grain refinement was achieved by controlling the thermal input to optimize the thermal history and heat accumulation.A heterogeneous microstructure with alternating coarse and fine grains was observed and intergranular thermal cracking was suppressed.The yield and tensile strengths increased from 262 to 416 MPa to 313 and 516 MPa,respectively,with improved consistency in the yield strength between the top and bottom sections.However,excessive laser heat input caused interlayer cracks.Conversely,increasing the heat input through substrate preheating did not induce additional cracks and improved the overall hardness consistency of the thin-walled samples.Therefore,this study proposes a new formability control strategy for OAFW-LDEDs of thin-walled parts.展开更多
文摘探讨了一种固态储氢装置的制造技术,且主要对罐体中异构材料焊接难点进行分析。首先,研究了不同参数下激光填丝焊接S30408异构材料(网状、块状)的焊接接头结构、形貌及力学性能差异,随后选取最优焊接参数焊接罐体内部,最后对单罐、整罐及水箱进行气密性和无损检测试验。结果表明,在激光功率为450 W和焊接速度35 mm min下,获得了无缺陷的异构材料焊接接头。与其他参数相比,焊接速度为35 mm min时,获得了无缺陷的焊接接头且拉伸强度与断后伸长率达到了最高,分别为165.3 MPa和5.51%。单个与整体罐体的气密性与整体无损检测达到设计标准。
基金supported by Open Research Fund of the Sichuan Institute of Xiamen University(Grant No.202401ZDB004)。
文摘Difficulties in the geometric and performance control of wire laser additive manufacturing have hindered its widespread application.In this study,an in situ process monitoring system that combines a machine vision-based interlayer height controller(IHC)and P-controller-based melt pool temperature controller(MTC)was developed to improve the vertical dimensional accuracy and mechanical properties of off-axis fine-wire laser-directed energy deposition(OAFW-LDED)for 316 L thin-walled parts.The IHC effectively mitigates external defect inheritance,while its synergy with the MTC ensures process stability,improving the vertical dimensional accuracy to±0.2 mm.Grain refinement was achieved by controlling the thermal input to optimize the thermal history and heat accumulation.A heterogeneous microstructure with alternating coarse and fine grains was observed and intergranular thermal cracking was suppressed.The yield and tensile strengths increased from 262 to 416 MPa to 313 and 516 MPa,respectively,with improved consistency in the yield strength between the top and bottom sections.However,excessive laser heat input caused interlayer cracks.Conversely,increasing the heat input through substrate preheating did not induce additional cracks and improved the overall hardness consistency of the thin-walled samples.Therefore,this study proposes a new formability control strategy for OAFW-LDEDs of thin-walled parts.
