大厚度钢锭氧-丙烷火焰切割热影响区组织及性能

Microstructure and mechanical properties in heat-affected zone of large-thickness steel ingot cut with oxygen-propane flame

摘要: 火焰切割所产生的被切割金属材料的组织变化直接影响到精密金属切削机床的加工余量,因此对切割断面区域的金相组织研究是优化切割工艺参数和提高断面质量的前提和基础.通过对厚度为900 mm的34CrNiMo6钢以及厚度为450 mm的45钢铸锭进行氧-丙烷火焰切割试验,并对切割断面热影响区宏观及微观组织进行观察,分析了热影响区组织变化对工件性能的影响,确定了切割热影响区的范围以及精密金属切削的机械加工余量,为进一步优化曲柄切割工艺参数及切割后加工起指导作用.

Abstract: The machining allowance of precision metal cutting machine tools depends on the microstructure evolution in heat-affected zone during flame cutting. In this paper,900 mm thick 34CrNiMo6 steel and 450 mm thick 45 carbon steel ingots were cut using an oxygen-propane flame. Then,the macroscopic morphology and microstructure in the heat-affected zone were examined to analyze the influence of microstructure evolution on the performance of workpieces. The range of heat-affected zone and machining allowance were determined to optimize the parameters during cutting and after cutting process.