| 微量元素钙在预硬型塑料模具钢中的行为及作用 |
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| 引用本文： | 孙培祯,乔学亮,江来珠,崔崑.微量元素钙在预硬型塑料模具钢中的行为及作用[J].华中科技大学学报(自然科学版),1992(Z1). |
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| 作者姓名： | 孙培祯 乔学亮 江来珠 崔崑 |
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| 作者单位： | 华中理工大学机械工程二系
(孙培祯，乔学亮，江来珠)，华中理工大学机械工程二系(崔崑) |
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| 基金项目： | 国家自然科学基金资助项目 |
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| 摘 要： | 对微量元素钙在硫钙复合系预硬型塑料模具钢5CrNiMnMoVSCa(简称5NiSCa)中的行为和作用进行了研究.结果表明,钙可使硫化物变质,促进硫化物纺锤化,其纺锤化的程度和Ca/S有密切关系;钙也可使氧化物变质,即使其成为夹心硫化物的夹心和易切削相.钙的这种变质行为能较大幅度地提高5NiSCa钢在预硬态(HRC35～45)下的切削加工性和等向性能,有效地克服单一硫系预硬型塑模钢的弱点.
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| 关 键 词： | 微量元素 钙 预硬型 塑模钢 |
The Behavior and Effect of Small Amounts of Calcium in Free-Cutting Prehardened Plastic Mould Steel |
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| Sun Peizhen Qiao Xueliang Jiang Laizhu Cui Kun.The Behavior and Effect of Small Amounts of Calcium in Free-Cutting Prehardened Plastic Mould Steel[J].JOURNAL OF HUAZHONG UNIVERSITY OF SCIENCE AND TECHNOLOGY.NATURE SCIENCE,1992(Z1). |
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| Authors: | Sun Peizhen Qiao Xueliang Jiang Laizhu Cui Kun |
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| Institution: | Sun Peizhen Qiao Xueliang Jiang Laizhu Cui Kun |
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| Abstract: | The behavior and effect of small amounts of calcium in free-cutting prehardened steel type 5CrNiMnMoVSCa(abbreviated as 5NiSCa)are investigated. Results obtained show that calcium modifies sulfides ,MnS,and promotes formation of spindle-shaped sulfides, (Mn,Ca) S,with oxide center and complex sulfides. The degree of spindling is closely related to the ratio Ca/S. Calcium also modifies oxides, transforms A12O3 into CaO.6Al2O3 (or CaO. 2Al2O3) and 2CaO.Al2O3.SiO2. The former acts as center of sulfides while the latter is a kind of free-cutting phase. The modifying effect of calcium improves significantly the cutta-bility of steel 5NiSCa in prehardened condition (HRC35 45) and its isotropy. |
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| Keywords: | prehardened type trace element calcium plastic mould steel |
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