Dissertation/ Thesis
Liquid phase sintering, mechanical property, and corrosion behavior of boron-containing powder metallurgy 304L stainless steel.
| العنوان: | Liquid phase sintering, mechanical property, and corrosion behavior of boron-containing powder metallurgy 304L stainless steel. |
|---|---|
| Alternate Title: | 含硼304L不銹鋼之液相燒結及機械性質與腐蝕行為研究 |
| المؤلفون: | Zih-Jie Lin, 林子傑 |
| Thesis Advisors: | Ming-Wei Wu, 吳明偉 |
| سنة النشر: | 2017 |
| المجموعة: | National Digital Library of Theses and Dissertations in Taiwan |
| الوصف: | 105 Liquid phase sintering (LPS) is an effective and economical way to improve the density of powder metallurgy (PM) products, and the most used element in Fe-based material for LPS is boron. The aim of this study was to investigate the effects of B content (0 wt%, 0.3 wt%, and 0.6 wt%) and sintering temperatures (1250 ℃, 1275 ℃, and 1300 ℃) on the LPS, mechanical properties, and corrosion behaviors of PM 304L stainless steel (Fe-18.45Cr-11.04Ni). The results show that adding 0.6wt% B to 304L can effectively promote LPS. The results about thermal analysis indicated that the liquid is generated between 1245 ℃ and 1277 ℃ during sintering. The microstructure consists of a large amount of eutectic constituent (austenite and M2B boride). The presence of 0.6 wt% B in 304L can significantly increase the sintered density after 1300 ℃ from 6.99 g/cm3 to 7.69 g/cm3, and the porosity is decreased from 13 vol% to 4 vol%. Due to the obvious densification effect, adding 0.6 wt% B improves from 324 MPa to 499 MPa. The elongation is as high as 16 %~17 %. Moreover, 0.6wt% B increase the corrosion potential from -0.358 V to-0.155 V, and decrease the corrosion current density from 3.80×10-6 A/cm2 to 6.16×10-8 A/cm2. The previous results indicate the B addition can improve the sintered density, mechanical properties, and corrosion performance. To compare the difference in the LPS of B-containing stainless steel and B-containing alloy steel, the LPS behavior of Fe-0.5Mo-0.4B-0.5C-4Ni alloy steel was also discussed. The results indicate that the presence of Cr and C result in the discrepancies in the LPS of the previous two systems. Adding Cr can increase the liquid generation temperature, and the sintering temperature must be increased for LPS. Furthermore, the participation of 0.5wt% C addition in the liquid reaction of Fe-0.5Mo-0.4B-0.5C-4Ni alloy steel can change the boride phase from M2B to M3(B,C). Moreover, adding C to alloy steel promotes the two-stage liquid generation. |
| Original Identifier: | 105TIT05159032 |
| نوع الوثيقة: | 學位論文 ; thesis |
| وصف الملف: | 108 |
| الاتاحة: | http://ndltd.ncl.edu.tw/handle/k343nc |
| رقم الانضمام: | edsndl.TW.105TIT05159032 |
| قاعدة البيانات: | Networked Digital Library of Theses & Dissertations |
| الوصف غير متاح. |