42CrMo调质钢碳氮共渗组织及性能研究

Study of Microstructure and Properties on Quenched and Tempered 42CrMo Steel after Carbonitriding

摘要: 采用碳氮共渗工艺，对42CrMo调质钢进行表面强化处理，研究了其组织变化对力学性能的影响。结果表明，经碳氮共渗工艺后，工件表面产生了一层0.14 mm厚的碳氮化合物层，芯部转变为隐晶马氏体加铁素体，材料组织得到了进一步细化，42CrMo调质钢的表面硬度达到650 HV，屈服强度达到1120 MPa，冲击韧性达到84 J/cm²。实验结果表明，销轴经碳氮共渗热处理后，42CrMo调质钢具有更好的强韧性，产品质量提高。

Abstract: Using carbonitriding process, the processing of quenched and tempered 42CrMo steel surface was strengthened, and the effect of its microstructure change on mechanical properties was investi-gated. The results show that, after carbonitriding process, a carbonitride layer of 0.14 mm is pro-duced on the workpiece surface; core is transformed into cryptocrystalline martensite and ferrite; material organization has been further refined; the surface hardness of quenched and tempered 42CrMo steel is 650 HV; the yield strength is 1120 MPa; and the impact toughness can reach 84 J/cm². The experimental results show that after carbonitriding heat treatment of the pin, quenched and tempered 42CrMo steel has better tenacity, and the product quality is improved.