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分析了不同正火温度对低合金铸钢ZG35Si Mn Mo的组织、强度以及冲击韧性的影响规律。结果表明,铸态铸钢中存在大量魏氏组织,强度及冲击性能较差,断面呈现出大面积较平区域。随着正火温度的提高,魏氏组织逐渐减少,并转化为粒状铁素体,强度和韧性提高,当正火温度达到900℃时,魏氏组织全部消失,转化为大小均匀的粒状铁素体,断口出现大量较深的韧窝,强度和冲击韧性最高,当正火温度超过900℃时,粒状铁素体和珠光体粗化,强度和冲击性能降低,说明最佳正火温度为900℃。
The influence of different normalizing temperature on microstructure, strength and impact toughness of low alloyed cast steel ZG35Si Mn Mo was analyzed. The results show that a large amount of Widmanstatten exists in the as-cast steel, which has poor strength and impact properties. The cross-section shows a large area and a relatively flat area. With the increase of normalizing temperature, Westend tissue gradually decreased and transformed into granular ferrite, which improved the strength and toughness. When the normalizing temperature reached 900 ℃, the Widman’s tissue disappeared completely and was transformed into granular ferrite A large number of deep dimples appeared on the fracture surface and had the highest strength and impact toughness. When the normalizing temperature exceeded 900 ℃, the granular ferrite and pearlite roughened, the strength and impact properties decreased, indicating that the optimum normalizing temperature was 900 ℃.