Hsiao-Hung Hsu - Academia.edu (original) (raw)

Papers by Hsiao-Hung Hsu

Research paper thumbnail of Mechanical degradation of cold-worked 304 stainless steel in salt spray environments

Journal of Nuclear Materials, 2012

Abstract Saline corrosion is one of the major degradation mechanisms for stainless steel 304 (SS3... more Abstract Saline corrosion is one of the major degradation mechanisms for stainless steel 304 (SS304) spent fuel canisters during the dry storage period. Slow strain rate tensile tests (SSRT) were conducted to determine the tensile strength and notched tensile strength (NTS) of cold-rolled SS304 in 0.5 and 5 wt% saline spray environments at 358 K. The YS and UTS of the steels did not decrease significantly in the 0.5 wt% saline spray environment, but a remarkable decrease in elongation was observed in the 5 wt% saline spray. Furthermore, a notch could exacerbate the saline corrosion degradation and aggravate the hydrogen embrittlement of SS304. The cold work of higher degrees could slightly improve SCC resistance of the SS304 under the lower chloride containing spray. However, the NaCl concentration is a crucial factor affecting the SCC susceptibility of SS304.

Research paper thumbnail of Effects of Nb-Addition on Carburizing Treatment for Low Carbon Steel

Carburization is widely applied to low carbon steel to increase its surface hardness and wear cap... more Carburization is widely applied to low carbon steel to increase its surface hardness and wear capability. In recent years, it has been feasible with technology to reduce the time of the carburizing process by means of increasing the carburizing temperature for the purposes of energy saving and high efficiency. However, grain coarsening accompanying the elevated-temperature carburizing process deteriorates the final mechanical properties and makes the dimensional accuracy worse induced by the heat treatment distortion. Hence, Niobium (Nb) micro-alloying was developed to prevent grain coarsening during elevated-temperature carburizing. In this study, the effects of Nb-additions on SAE 1022 carbon steel in a gas carburizing process would be analyzed to compare the carburizing properties with traditional SAE 1022. In elevated-temperature carburizing, the Nb-modified SAE 1022 steel showed a faster carbon atom diffusion and deeper case depth than the conventional one. Finally, an optimiza...

Research paper thumbnail of Fast Image Classification for Grain Size Determination

Metals

With the increasing application of steel materials, the metallographic analysis of steel has gain... more With the increasing application of steel materials, the metallographic analysis of steel has gained importance. At present, grain size analysis remains the task of experts who must manually evaluate photos of the structure. Given the software currently available for this task, it is impossible to effectively determine the grain size because of the limitations of traditional algorithms. Artificial intelligence is now being applied in many fields. This paper uses the concept of deep learning to propose a fast image classifier (FIC) to classify grain size. We establish a classification model based on the grain size of steel in metallography. This model boasts high performance, fast operation, and low computational costs. In addition, we use a real metallographic dataset to compare FIC with other deep learning network architectures. The experimental results show that the proposed method yields a classification accuracy of 99.7%, which is higher than existing methods, and boasts computat...

Research paper thumbnail of Notch brittleness of Ti–15V–3Cr–3Sn–3Al alloys

Materials Science and Engineering: A, 2012

Research paper thumbnail of Fracture properties of hydrided Zircaloy-4 cladding in recrystallization and stress-relief anneal conditions

Journal of Nuclear Materials, 2012

Research paper thumbnail of Effect of hydride orientation on fracture toughness of Zircaloy-4 cladding

Journal of Nuclear Materials, 2011

Research paper thumbnail of The influence of hydride on fracture toughness of recrystallized Zircaloy-4 cladding

Journal of Nuclear Materials, 2014

Research paper thumbnail of An evaluation of hydrided Zircaloy-4 cladding fracture behavior by X-specimen test

Journal of Alloys and Compounds, 2006

Hydrogen embrittlement is one of the major degradation mechanisms of Zircaloy (Zry) fuel cladding... more Hydrogen embrittlement is one of the major degradation mechanisms of Zircaloy (Zry) fuel cladding at high burnups. In this study, a novel technique, named X-specimen test method, was developed to analyze the effects of hydrogen concentration and temperature on the fracture properties of Zry-4 cladding. The X-specimens were machined from the cladding sections hydrogen-charged to the target hydrogen concentrations between 150 and 1200 ppm. The toughness values for the as-received Zry-4 cladding specimens at room temperature and 300 • C were very reproducible. The toughness values for Zry-4 cladding at room temperature decreased significantly as hydrogen concentration increased. However, the toughness value at 300 • C was not sensitive to hydrogen concentration.

Research paper thumbnail of Mechanical degradation of cold-worked 304 stainless steel in salt spray environments

Journal of Nuclear Materials, 2012

Abstract Saline corrosion is one of the major degradation mechanisms for stainless steel 304 (SS3... more Abstract Saline corrosion is one of the major degradation mechanisms for stainless steel 304 (SS304) spent fuel canisters during the dry storage period. Slow strain rate tensile tests (SSRT) were conducted to determine the tensile strength and notched tensile strength (NTS) of cold-rolled SS304 in 0.5 and 5 wt% saline spray environments at 358 K. The YS and UTS of the steels did not decrease significantly in the 0.5 wt% saline spray environment, but a remarkable decrease in elongation was observed in the 5 wt% saline spray. Furthermore, a notch could exacerbate the saline corrosion degradation and aggravate the hydrogen embrittlement of SS304. The cold work of higher degrees could slightly improve SCC resistance of the SS304 under the lower chloride containing spray. However, the NaCl concentration is a crucial factor affecting the SCC susceptibility of SS304.

Research paper thumbnail of Effects of Nb-Addition on Carburizing Treatment for Low Carbon Steel

Carburization is widely applied to low carbon steel to increase its surface hardness and wear cap... more Carburization is widely applied to low carbon steel to increase its surface hardness and wear capability. In recent years, it has been feasible with technology to reduce the time of the carburizing process by means of increasing the carburizing temperature for the purposes of energy saving and high efficiency. However, grain coarsening accompanying the elevated-temperature carburizing process deteriorates the final mechanical properties and makes the dimensional accuracy worse induced by the heat treatment distortion. Hence, Niobium (Nb) micro-alloying was developed to prevent grain coarsening during elevated-temperature carburizing. In this study, the effects of Nb-additions on SAE 1022 carbon steel in a gas carburizing process would be analyzed to compare the carburizing properties with traditional SAE 1022. In elevated-temperature carburizing, the Nb-modified SAE 1022 steel showed a faster carbon atom diffusion and deeper case depth than the conventional one. Finally, an optimiza...

Research paper thumbnail of Fast Image Classification for Grain Size Determination

Metals

With the increasing application of steel materials, the metallographic analysis of steel has gain... more With the increasing application of steel materials, the metallographic analysis of steel has gained importance. At present, grain size analysis remains the task of experts who must manually evaluate photos of the structure. Given the software currently available for this task, it is impossible to effectively determine the grain size because of the limitations of traditional algorithms. Artificial intelligence is now being applied in many fields. This paper uses the concept of deep learning to propose a fast image classifier (FIC) to classify grain size. We establish a classification model based on the grain size of steel in metallography. This model boasts high performance, fast operation, and low computational costs. In addition, we use a real metallographic dataset to compare FIC with other deep learning network architectures. The experimental results show that the proposed method yields a classification accuracy of 99.7%, which is higher than existing methods, and boasts computat...

Research paper thumbnail of Notch brittleness of Ti–15V–3Cr–3Sn–3Al alloys

Materials Science and Engineering: A, 2012

Research paper thumbnail of Fracture properties of hydrided Zircaloy-4 cladding in recrystallization and stress-relief anneal conditions

Journal of Nuclear Materials, 2012

Research paper thumbnail of Effect of hydride orientation on fracture toughness of Zircaloy-4 cladding

Journal of Nuclear Materials, 2011

Research paper thumbnail of The influence of hydride on fracture toughness of recrystallized Zircaloy-4 cladding

Journal of Nuclear Materials, 2014

Research paper thumbnail of An evaluation of hydrided Zircaloy-4 cladding fracture behavior by X-specimen test

Journal of Alloys and Compounds, 2006

Hydrogen embrittlement is one of the major degradation mechanisms of Zircaloy (Zry) fuel cladding... more Hydrogen embrittlement is one of the major degradation mechanisms of Zircaloy (Zry) fuel cladding at high burnups. In this study, a novel technique, named X-specimen test method, was developed to analyze the effects of hydrogen concentration and temperature on the fracture properties of Zry-4 cladding. The X-specimens were machined from the cladding sections hydrogen-charged to the target hydrogen concentrations between 150 and 1200 ppm. The toughness values for the as-received Zry-4 cladding specimens at room temperature and 300 • C were very reproducible. The toughness values for Zry-4 cladding at room temperature decreased significantly as hydrogen concentration increased. However, the toughness value at 300 • C was not sensitive to hydrogen concentration.