【摘 要】
：
The gas tungsten arc welding based additive manufacturing (GTAW-AM) was carried out by printing 316L austenitic stainless steel on carbon steel substrate with d
【机 构】
：
College of Mechanical and Electrical Engineering, Hohai University, Changzhou 213022, China;Nantong
【出 处】
：
武汉理工大学学报（材料科学版）（英文版）
论文部分内容阅读
The gas tungsten arc welding based additive manufacturing (GTAW-AM) was carried out by printing 316L austenitic stainless steel on carbon steel substrate with different arc currents (140, 160, 180 A). Microstructure and corrosion resistance of additive manufactured components were investigated. The results show that the microstructure of the GTAW-AM austenitic stainless steel is obviously changed by the arc current. With arc current increasing from 140 to 180 A, the austenite grains become coarse due to the effect of welding heat input. Meanwhile, the quantity of ferrites in the austenite matrix is decreased and the morphology transforms from lath to skeleton. Moreover, σ phases are finally formed under the arc currents of 180 A owing to high welding heat input. Therefore, as the microstructure transform into coarse-grained austenites, low-quantity ferrites and new-generated σ phases, the GTAW-AM austenitic stainless steel presents a significantly decrease in corrosion resistance. And the reduction of corrosion resistance is mainly?due?to the formation of σ phase as a result from consuming the large amounts of Cr element from the matrix.
其他文献
In order to optimize the tool coating material and reduce the tool wear rate, the coating material and wear mechanism for carbide tools are proposed and analyze
提高实时测控软件的实时性、可靠性、可重用性和安全性,已成为航天测控通信系统研究与发展中的重要研究课题。探讨了我国航天测控软件存在的不良现状,阐述了建立我国一体化航
卫星遥测软件中有许多遥测参数的处理方法是相同的;不同型号卫星遥测处理软件也有许多相似的地方。手工编写遥测软件,重复性劳动多,易于出错。天地一体化测控中,基于XML技术
目的:了解婴儿死亡情况,评价婴儿各种死因的影响,提出防治建议。方法:采用分层随机整群抽样方法调查每一个死亡婴儿,获得婴儿死亡率、死因别死亡专率、期望寿命耗损率等指标,
The hot deformation behavior of an ultralow-carbon microalloyed steel was investigated using an MMS-200 thermal simulation test machine in a temperature range o
在简单介绍航天测控网运行方式发展和现状的基础上,根据航天测控系统发展趋势和要求,以及测控自动化和分布式软硬件环境的需求,给出了面向分布式软硬件运行环境的主从式调度
In Time Division Synchronous Code Division Multiple Access (TD-SCDMA) systems,the Global Positioning System (GPS) signal is often blocked or experiences interfe
生物學通報1953年3-4月號148頁問題解答(七)關於地質年代的解答,因為最後抄漏了一句而有了錯覺,最後一句應為“……即由中生代開始到現在是一億八千萬年;由古生代初到今是三
讨论了测控计算机系统一种新的时间统一的实现方法;介绍了基于串口时统和网络授时软件的设计与开发,实践证明,该软件运行稳定可靠,使用方便,实时性强。
由於美国政府所采取的阻挠和拖延战术,朝鲜停战谈判自四月二十六日复会以来又拖下来了。迄至笔者撰写本文时的五月二十五日为止,双方的谈判会议在美方要求之下休会了八天之