【作者】 严伟林；

【导师】 林元祖；

【作者基本信息】 广西大学 ， 机械设计及理论， 2003， 硕士

【摘要】 本文研究通过成分优化制备铸态奥氏体—贝氏体钢，钢的成分为（wt％）0.45—0.75％C、2.0—3.0％Si、2.0-3.O％Mn、1.5—2.5％Cr及适量Mo、V、Ti、RE等。采用正交试验L₉（3⁴）进行试验，熔炼温度为1560℃，浇注温度为1500—1520℃，均采用潮模砂铸造试样，对试件进行硬度试验，冲击韧性试验，磨损试验和铸钢件组织的显微硬度试验及观测显微组织和磨损分析，方差分析合金元素及其量对试件的冲击韧性、硬度、耐磨性的影响，确定最优的合金成分；用灰关联理论分析合金含量、冲击韧性和硬度等对相对耐磨性的影响程度；探讨了材料的金相组织及材料性能等对试验材料耐磨性的影响。 化学成分是影响试件硬度的主要因素，由主到次顺序为Cr、Si、C、Mn，当C（0.60％） Si（2.5％） Mn（2.0％） Cr（2.5％）硬度最佳：影响冲击韧性因素由主到次顺序为C、Si、Cr、Mn，当C（0.45％）、Si（2.0％）、Mn（2.5％）、Cr（1.5％），冲击韧性最佳；影响试件的相对耐磨性因素由主到次顺序为Cr、C、Si、Mn，当C（0.75％）、Si（2.5％）、Mn（2.5％）、Cr（2.5％），相对耐磨性最佳。由灰关联分析可知洛氏硬度值对材料的相对耐磨性影响最大，其它因素对耐磨性的影响排列依次为Cr、C、Mn、Si和冲击韧性。更多还原

【Abstract】 This paper has been studied the making-up process of one kind of medium-high carbon alloy steels-the cast austenite-bainite structure steel by the means of optimum of composition, which contains (wt%) 0.45 -0.75%C, 2.0-3.0%Si, 2.0-3.0%Mn, 1.5-2.5%Cr and appropriate content of Mo> V> Ti> Re .The tests were based on the means of the orthogonal tests with L9 (34 ) . During the tests, the smelting temperature was elevated to 1560℃. The pouring temperature was 1500-1520℃. Casting samples were made in green-sand mold. After that, the series of tests including hardness, resistance to shock and abrasion were carried out. The microstructure was inspected and the abrasion was analysed and the optimum content of alloy elements were determined. The influential levels of the alloy elements content, impact toughness and hardness to the relative abrasion resistance were ascertained by the means of the gray connective analysis; furthermore, the influence on theabrasion resistant were predicted by the analysis of the metallographic structure, the carbide , and material properties.The elements added in the tests influence on the hardness are arranged by the orders from major to minor: Cr, Si, C, Mn- especially when their contents are 2.5%,2.5%, 0.60%, 2.0% respectively, hardness reaches the optimum. The elements influence on the impact toughness arranged by the orders from major to minor is C, Si, Cr, Mn-especially when 0.45%, 2.0%, 1.5%, 2.5% respectively, the impact toughness reaches optimum. The elements influence on the relative abrasion resistance arranged by the orders from major to minor is Cr, C, Si, Mn-especially when 2.5%, 0.75%, 2.5%, 2.5% respectively, the abrasion resistance reaches optimum.更多还原