NA-EBSD-AZtecHKL-金属

2018/01/08   下载量： 8 次

方案摘要

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应用领域 钢铁/金属
检测样本 其他
检测项目 理化分析>微区成分分析, 形貌观察分析
参考标准 无

Abstract. This study investigates the changes in radial micro-texture via Kearn’s f-factors during single cold pilger reduction of a titanium Ti-3-2.5 alloy as a result of strain path changes from tooling modifications. EBSD results confirm that the texture intensity as well as the radial f-factors can be increased by modifications of pilgering tooling. In addition a switch between the secondary prism planes which lie normal to the pilger direction in the starting tube to primary prism planes after pilgering has been observed. Material and Experimental The tubes investigated were made from Ti alloy 3Al 2.5V, they were manufactured via hot extrusion and then cold pilgered. The cold pilger process configuration is schematically shown in Figure 1. Two strain paths, shown in the ‘Q‘ factor chart in Figure 2, were used in the manufactiure: texture minimised and texture maximised. They were annealed at 750oC before being cold pilgered and for this investigation they were stress relieved at 530oC for 2 hours prior to EBSD examination. Specimens were extracted from two regions either side of the reduced tube as shown in the schematic Figure 2, mounted in conductive Bakelite and polished mechanically for EBSD examination. The final polish was carried out using vibratory polishes using a mixture of 5:2 colloidal silica, hydrogen peroxide mixture. EBSD examination was conducted using a FEGSEM and OI EBSD Nordlys detector and AZtec Software.

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Abstract. This study investigates the changes in radial micro-texture via Kearn’s f-factors during single cold pilger reduction

of a titanium Ti-3-2.5 alloy as a result of strain path changes from tooling modifications. EBSD results confirm that the

texture intensity as well as the radial f-factors can be increased by modifications of pilgering tooling. In addition a switch

between the secondary prism planes which lie normal to the pilger direction in the starting tube to primary prism planes

after pilgering has been observed.

Material and Experimental

The tubes investigated were made from Ti alloy 3Al 2.5V, they were manufactured via hot extrusion and then cold pilgered.

The cold pilger process configuration is schematically shown in Figure 1. Two strain paths, shown in the ‘Q‘ factor chart in

Figure 2, were used in the manufactiure: texture minimised and texture maximised. They were annealed at 750oC before

being cold pilgered and for this investigation they were stress relieved at 530oC for 2 hours prior to EBSD examination.

Specimens were extracted from two regions either side of the reduced tube as shown in the schematic Figure 2, mounted

in conductive Bakelite and polished mechanically for EBSD examination. The final polish was carried out using vibratory

polishes using a mixture of 5:2 colloidal silica, hydrogen peroxide mixture. EBSD examination was conducted using a

FEGSEM and OI EBSD Nordlys detector and AZtec Software.


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牛津仪器科技（上海）有限公司
白金会员 丨 第23年
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