论文部分内容阅读
我厂生产的18CrNiWA钢轴承零件,如图1。要求单面渗碳,渗层深度为0.8～1.2mm,硬度≥HRC60,机械性能要求σ_b≥120kgf/mm~2、σ_s≥105kgf/mm~2、≥10%、ψ≥50%、α_h≥8kgf-m/cm~2。为了达到技术要求,工件先经910℃×6h渗碳,渗碳层达到1～1.2mm,渗层表面碳浓度约1%。然后在680℃进行二次高温回火,以减少淬火后的残留奥氏体含量,随后再进行淬火、冷处理、低温回火。我们发现,18CrNiWA钢按常规处理机械性能和工件表面硬度完全可以达到技术要
I produced 18CrNiWA steel bearing parts, shown in Figure 1. Requires single-sided carburizing, infiltration depth of 0.8 ~ 1.2mm, hardness ≥ HRC60, mechanical properties require σ_b ≥ 120kgf / mm ~ 2, σ_s ≥ 105kgf / mm ~ 2, ≥ 10%, ψ ≥ 50%, α_h ≥ 8kgf -m / cm ~ 2. In order to meet the technical requirements, the workpiece is first carburized at 910 ℃ × 6h, the carburized layer reaches 1 ~ 1.2mm, and the carbon concentration on the surface of the infiltrated layer is about 1%. Followed by secondary tempering at 680 ° C to reduce the retained austenite content after quenching followed by quenching, cold treatment and tempering at low temperatures. We found that 18CrNiWA steel by conventional treatment of mechanical properties and surface hardness can reach the technical requirements