Influence of isothermal quenching of LAMC CrMnSi cast steel on impact toughness

The influence of isothermal quenching process of low-alloy and medium carbon (LAMC) CrMnSi cast steel on the impact toughness was investigated. The microstructure and mechanical property of LAMC CrMnSi cast steel were analyzed by the laser optical modulator, the scanning electron microscopy, the energy dispersive spectrometer, the hardness and impact tests. The experimental results show that the dual phases of bainite and residual austenite can be obtained by the severity isothermal quenching, the fractographies of specimens change from quasi-cleavage to dimple at 310℃ for 60min, the impact toughness for specimens at the room temperature isothermally (achieves) 130J/cm^2, meantime and its hardness is more than 45(HRC).

30CrMnSi钢过热组织超细化工艺对比研究

对 30 Cr Mn Si钢过热组织采用多种热处理工艺进行了超细化处理 ,运用定量金相分析技术对处理结果进行了对比和评价 ,并讨论了每种工艺的晶粒细化机制。结果表明 :“两次正火 +淬火”工艺对该钢的过热组织超细化效果显著 ;当循环次数为 2～ 3次时 ,“奥氏体单相循环淬火”

低碳低合金铸钢力学性能的研究

利用Olympus光学显微镜、扫描电镜(SEM)及能谱分析(EDAX)探讨了等温淬火工艺对低碳低合金CrMnSi铸钢力学性能的影响,并通过XRD定量分析了相的组成。结果表明,合适的等温淬火工艺,可获得一定数量的贝氏体和残余奥氏体(约6%)的复合组织,冲击断口形貌由解理刻面变为韧窝状,铸造成形无缺口试样(10 mm×10 mm×55 mm)的冲击韧度由αk≤30 J/cm2 增加至αk≥170 J/cm2,硬度HRC≥40,具有较高硬度和冲击韧度的配合。