钼镧合金厚板材退火工艺对其热成形性影响研究

Effects of Annealing Process on Thermal Deep Drawing of Mo-La Plate

由于钼具有室温脆性的特点,对于壁厚大于2.0 mm的钼制品无法在室温下进行冲压成形,因此需研究钼及其合金高温成形的特点,对其进行高温力学性能研究,以便制备出合格的产品,并能保证产品的性能稳定。采用传统固-液掺杂方式制备出Mo-0.8%La的合金粉末,通过粉末冶金方法压制、烧结及轧制出厚度为3.5 mm的板材,在不同的退火温度下对板材组织性能进行分析,并进行高温拉伸试验。结果表明:板材的拉伸工艺中两个比较重要的工艺点为:退火温度1 300℃、冲压温度700℃,在此条件下制备的钼镧合金板材具有较好的热成形性。

Molybdenum plates with thickness more than 2.0 mm can not be drawing process at room temperature because of brittleness. In order to study the deep drawability of molybdenum and molybdenum alloys at high temperature, the mechanical properties of molybdenum and molybdenum alloys at high temperature must be studied.Mo-0.8 %La powder was processed by the solid-liquid doping. The thickness of 3.5 mm Mo plate was prepared by pressing, sintering and rolling. It was studied on the analysis of microstructure at different annealing temperatures and the test of different temperature tensile. The results show that the Mo-La plate has better thermal deep drawing properties under 1 300 ℃ annealing temperature and 700 ℃ thermal drawing temperature than others.