温度梯度和冷却速率对ZL205A合金凝固组织及性能的影响

Effect of Temperature Gradient and Cooling Rate on Solidification Structure and Properties of ZL2O5A Alloy

由于在不同温度梯度下ZL205A合金冷却速率对凝固组织的影响不同,采用不同壁厚的阶梯状结构的合金,在不同凝固条件下制备厚度不同的合金试样,探究了冷却速率及温度梯度对合金凝固组织及T5处理后合金抗拉伸强度及延伸率的影响,同时探索了合金的相变规律与组织和性能的关联效应。实验结果表明:由壁厚差引起的温度梯度对合金的微观组织及形貌会产生一定的影响,降低温度梯度的合金力学性能显著提升,T5处理后合金的抗拉伸强度达到506 MPa。

Due to different influences of cooling rate on the solidification structure of ZL205A alloy under different temperature gradients, the ZL205A alloy with stepped structure of different wall thicknesses was used, and the specimens of different thicknesses were prepared under different solidification conditions. The effects of cooling rate and temperature gradient on solidification structure and tensile strength and elongation of alloys after T5 treatment were explored. In addition, the correlation effect of the phase transformation law with the structure and performance was explored. Results show that the temperature gradient caused by different wall thicknesses have a certain impact on the microstructure and morphology of the alloys. Reducing the temperature gradient can significantly improve the mechanical properties of the alloys. After T5 treatment, the tensile strength of the alloys achieves 506 MPa.