Development of a new multi-component white cast iron for cold work roll

冷工作辊用新型多元白口铸铁的研制

• 批准号: 14550730
• 负责人: SASAGURI Nobuya
• 金额: $ 1.92万
• 依托单位: Kurume National College of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14550730/
• 关键词: Multi-component white cast iron; MC carbide; M2C carbide; Solidification structure; continuous cooling transformation; heat treatment; abrasive wear; Roll material; 焼戻し; 連続冷却変形; マルテンサイト; ベイナイト; パーライト; 二次硬化; M7C3炭化物; デンドライト間隔

In order to develop a new multi-component white cast iron for cold work roll, the optimum chemical compositions were investigated, and the relationship between the solidification structure and the solidification conditions, and the characteristics of transformation and heat treatment, and abrasion wear characteristics were examined about the cast iron with the optimum chemical compositions. Following chemical composition is recommended as the optimum chemical composition. Carbon content is 1-1.5%. Chromium content is 5%. Molybdenum content is 5% or more. Vanadium content is 1% or more. The cast irons with optimum chemical compositions contain MC and M_2C eutectic carbides of 9% to 12%. Solidification structure of the cast irons depends on the cooling rate, and the secondary dendrite arm spacing and sizes of MC and M_2C carbides, which are shown as a function of the cooling rate, become smaller with an increase in cooling rate. Martensite and retained austenite coexist in the cast irons in hardened state because Mf was not observed in the cast irons. The hardnabihty of the cast irons is good because the noses of pearlite and bainite transformation are on a long time side. The curves of temper hardness of the cast irons show the secondary hardening which is usually seen in highly alloyed tool steels and multi-component white cast irons with high carbon, and the tempered hardness of the cast irons reached the maximum value(about 850HV) at around 800K. It's hardness is higher than the necessary hardness (800HV) for cold work roll. It is thought from the results of suga abrasion wear tests that abrasion wear resistance of the cast irons is somewhat lower than that of the multi-component white irons with high carbon.

为了开发一种新型多组元白色铸铁冷轧辊，研究了最佳化学成分，并对最佳化学成分铸铁的凝固组织与凝固条件的关系、相变特性、热处理特性和磨损特性进行了试验研究。推荐以下化学成分作为最佳化学成分。碳含量为1- 1.5%。铬含量为5%。钼含量为5%或更高。钒含量为1%或更高。最佳化学成分的铸铁中MC和M_2C共晶碳化物含量为9%~ 12%。铸铁的凝固组织取决于冷却速度，MC和M_2C碳化物的二次枝晶臂间距和尺寸随冷却速度的变化而变小。由于没有观察到马氏体相变，因此在硬化状态下，马氏体和残余奥氏体共存。由于珠光体和贝氏体转变的时间偏长，铸铁的硬度较好。回火硬度曲线显示出高合金工具钢和高碳多元白色铸铁中常见的二次硬化现象，回火硬度在800 K左右达到最大值（约850 HV）。其硬度高于冷工作辊所需的硬度（800 HV）。由suga磨料磨损试验结果认为，该铸铁的耐磨性略低于高碳多元白色铸铁。

项目成果

Y.Matsubara, N.Sasaguri: "Heat Treatment Characteristics of Multi-component White Cast Iron"Proc.of ABRASION WEAR RESISTANT ALLOYED WHITE CAST IRON FOR ROLLING AND PULVERRIZING MILLS-ABRASION 2002. 207-216 (2002)

Y.Matsubara, N.Sasaguri：“多组分白口铸铁的热处理特性”Proc.of ABRASION WEAR RESISTANT ALLOYED WHITE CAST IRON FOR ROLLING AND PULVERRIZING MILLS-ABRASION 2002. 207-216 (2002)

Y.matsubara, N.Sasaguri: "Heat Treatment Characteristics of Multi-component White Cast Iron"Prod. Abrasion Wear Resistant Alloyed White Cast Iron for Rolling and Pulverrizing Mills-Abrasion 2002. 207-216 (2002)

Y.matsubara、N.Sasaguri：“多成分白口铸铁的热处理特性”产品。