در این مقاله رفتار سوپرپلاستیک آلیاژ sn-1%bi در شرایط mdf شده، توسط آزمون پانچ برشی در دمای اتاق (t>0.6tm) موردبررسی قرار گرفت. نتایج آزمون پانچ برشی مقدار ضریب حساسیت به نرخ کرنش (m)  را برای نمونه­های 2، 4، 6 و 8 پاس mdf شده به ترتیب 11/0، 23/0، 35/0 و 53/0 گزارش کرد. این مقادیر نیز نشان می­دهد که نمونه­های 6 و 8 پاس mdf شده رفتار سوپرپلاستیک را تجربه می­کنند. تصاویر میکروسکوپ نوری نشان دادند...

In this study, residual stresses from the electron beam additive manufacturing (EBAM) and selective laser melting (SLM) processes, due to repeated thermal cycles, were investigated. Residual stresses play a crucial role in part performance, and thus, it is critical to evaluate the process-induced residual stresses in AM parts. Ti-6Al-4V and Inconel 718 parts produced by EBAM and SLM, respective...

Titanium alloy Ti–6Al–4V and nickel-based superalloy Inconel 718 have been widely employed in modern manufacturing. The published literature on high speed machining (HSM) of the two materials often involves different machining set-up, which makes it difficult to directly apply the research findings from onematerial to the other to select the most appropriate tool geometry and cutting conditions...

The objective of this investigation was to develop an innovative methodology for life and reliability prediction of hot-section components in advanced turbopropulsion systems. A set of generic microstructure-based time-dependent crack growth (TDCG) models was developed and used to assess the sources of material variability due to microstructure and material parameters such as grain size, activa...

Companion laboratory-scale studies were conducted on specimens of ESR alloy 718 in order to determine responsiveness of this material to several of the macroetching techniques used in the industry. The work developed from initial efforts to define the relative sensitivity to Alloy 718 segregation of the macroetchants in standard use at the respective locations of Into Alloys International: one ...