压力渗碳工艺试验与应用

对20CrMnTi钢压力渗碳工艺研究结果表明,在保证产品质量的前提下,显著提高渗碳速度,缩短工艺周期,降低 生产成本。同时,对压力渗碳工艺的机理进行了初步探讨。

齿轮压力渗碳及硬化工艺研究

分析了渗碳齿轮材料的选择,渗碳工艺与热处理技术,对20CrMnTi钢齿轮压力渗碳及硬化工艺进行了研究,实验结果表明:可在保证产品硬度的前提下,显著提高渗碳速度,缩短工艺周期,降低生产成本。

Threshold pressure and infiltration behavior of liquid metal into fibrous preform

A dynamic measuring apparatus was developed to investigate the infiltration process of liquid metal into the fibrous preform. 10% （volume fraction） chopped carbon fiber preforms were infiltrated with magnesium alloy under different infiltration pressures. The threshold pressure and flow behavior of liquid metal infiltrating into the preforms were calculated and measured. The microstructure of obtained Ct4Mg composites was observed. The results indicate that the measured threshold pressure for infiltration was 0.048 MPa, which was larger than the calculated value. The infiltration rate increased with the increase of infiltration pressure, but the increase amplitude decreased gradually. The tiny pores in the composites could be eliminated by increasing the infiltration pressure. When the infiltration pressure rose to 0.6 MPa, high quality C1/Mg composite was obtained.

20CrMo钢滑块真空低压渗碳

在WZST系列双室真空渗碳炉上,对满装炉条件下的20CrMo钢滑块进行了真空渗碳工艺研究。结果表明,在4000 Pa渗碳压力、保压25 s、渗碳时间220 min及合适的渗扩比条件下,20CrMo钢滑块经930℃真空渗碳,预冷气油淬,180℃×2 h回火处理后,变形量在0.02~0.04 mm内,有效硬化层深度在0.95~1.0 mm之间,硬度均达到60~62 HRC,完全符合工艺要求,实现了密集装炉条件下的渗碳均匀性。