Surface Post-processing of Additive Manufactured Metallic Materials

主講人 : Sara Bagherifard

激光粉末床熔融（Laser powder bed fusion）作為一種新型增材制造技術(shù)，在復(fù)雜零件制造應(yīng)用中具有突出優(yōu)勢。本研究評估了激光粉末床熔融結(jié)合不同表面強(qiáng)化、熱處理、化學(xué)處理等后處理技術(shù)對零件表面完整性及疲勞性能的影響，發(fā)現(xiàn)所應(yīng)用后處理在改善表面粗糙度、提升表面硬度及殘余應(yīng)力等方面具有重要效果，有助于改善零件疲勞性能。

Laser powder bed fusion (LPBF), as one of the widely used additive manufacturing (AM) technologies, offers prominent advantages in fabrication of parts with complex geometries. This study evaluates the effect of various impact- d surface treatments and their combination with thermal and chemical post-treatments on fatigue performance of AlSi10Mg specimens prepared using laser powder bed fusion (LPBF). The results confirmed the overall favourable effect of the applied post processing treatments in enhancing the fatigue performance of the samples. The surface treatments led to considerable reduction in surface roughness. The mechanical treatments also induced residual stresses, surface   work hardening, and improved fatigue performance. The heat treatment applied also had an important role in homogenizing the microstructure and releasing the undesirable residual stresses induced during fabrication.

主講人簡介：

Sara Bagherifard，博士，米蘭理工大學(xué)機(jī)械工程系副教授，國際知名的表面工程研究領(lǐng)域青年學(xué)者，主要研究方向?yàn)楸砻嫣幚怼⒈砻嫱繉?、納米材料和增材制造。發(fā)表專著1部，在國際權(quán)威學(xué)術(shù)期刊與國際會議上發(fā)表論文100多篇，累積引用量3000余次。獲米蘭理工大學(xué)國際博士后獎學(xué)金、麻省理工學(xué)院意大利分校羅伯托·羅卡博士后獎學(xué)金、斯倫貝謝基金會未來教員獎學(xué)金、青年科學(xué)家講座金獎(表面，涂層和納米結(jié)構(gòu)材料協(xié)會(NANOSMAT))、青年研究員獎(IGF)和最佳演講獎(SEMDOC，日利納大學(xué))，是意大利米蘭理工大學(xué)表面強(qiáng)化課題組研究骨干。

Dr. Sara Bagherifard is an Associate Professor in Department of Mechanical Engineering, Politecnico di Milano. She is an internationally renowned young scholar in the field of surface engineering. Her main scientific interests are innovative methods for surface treatments, coatings techniques, and additive manufacturing. She published over 100 papers in prestigious international academic journals and international conferences with over 3000 citations. She was awarded the International Postdoctoral Fellowship from Politecnico di Milano, the Roberto Rocca Fellowship from the Massachusetts Institute of Technology, the Future Faculty Fellowship from the Schlumberger Foundation, and the Young Scientist Lecture Gold Award from the Society of NANOSMAT. She is a key researcher in the Surface treatment research group at Politecnico di Milano.