微合金化压铸模具钢力学性能研究
本课题研究不同Ni、Mo、Si、Mn含量对模具钢力学性能的影响，分成3种钢，407钢，Dievar钢，U2钢。对比研究不同含Ni、Mo、Si、Mn量模具钢硬度、拉伸性能和冲击性能，探讨Ni等元素对模具钢力学性能的影响规律。
研究结果表明：(1)三种钢的硬度由大到小为：Dievar钢、U2钢、407钢(2)抗拉强度由高到低为：U2钢、Dievar钢、407钢，屈服强度由高到低为：U2钢、Dievar钢、407钢，塑性由高到低为：Dievar钢、407钢、U2钢；(3)冲击韧性由好到差为：Dievar钢、407钢、U2钢。
毕业论文关键词：微合金化；模具钢；硬度；拉伸性能；冲击性能
Abstract Micro-alloyed steels is a high technology in the fields of materials and metallurgical engineering,adding trace metal elements Nb,V, Ti etc。 into steel, improve the strength and toughness of steel,which can put in a low cost of the steel's overall performance has improved significantly。 Today,about mechanical properties of micro-alloyed steel casting molds there has been a lot of research,but on different Ni, Mo,Si and Mn content of micro-alloyed of fewer studies on mechanical properties of micro-alloyed steel casting molds,there is necessary to study the mechanical properties of micro-alloyed steel casting molds 。
In this paper,the effects of different Ni,Mo,Si and Mn contents on the mechanical properties of die steel are studied,which are pided into 3 kinds of steel,407steel, Dievar steel and U2 steel。 The hardness,tensile and impact properties of die steels with different Ni,Mo,Mn and Si were compared and studied,the influence of Ni and other elements on the mechanical properties of die steel is discussed。
Research results show that: (1) the hardness of three types of steel from large to small: Dievar steel,U2 steel,407steel;(2) Tensile strength from high to low is: U2 steel, steel Dievar, 407steel。 Yield strength from high to low: U2 steel, steel Dievar, 407 steel。 Plastic of from high to low: steel Dievar, 407 steel, U2 steel; (3) Toughness from good to bad for: steel Dievar, 407 steel, U2 steel 。
Key words：Micro-alloyed；die Steel；hardness; tensile properties；impact performance
目录
第一章 绪论 1
1。1 引言 1
1。2 国内外研究现状 2
1。3 微量元素在合金中的作用机制 3
1。3。1 微量 Si 3
1。3。2 微量 Mn 4
1。3。3 微量 Mo 4
1。3。4 微量Ni 5
1。3。5 微量W 5
1。4 三种钢的简介 5
1。4。1 407钢的简介 5
1。4。2 Dievar钢的简介 6
1。4。3 U2钢的简介 7
1。5 选题的目的及意义 8
1。6 本课题的研究内容 9
第二章 三种钢的力学性能试验 10
2。1 钢的热处理工艺 10
2。1。1 预先热处理工艺 10
2。1。2 最终热处理工艺 10
2。2 硬度试验设备及方法 11
2。3 拉伸试验设备和方法 13