经磁场淬火和高温回火的T10钢的力学性能

与经普通淬火和高温回火的相比,经磁场淬火和高温回火的T10钢的抗拉强度提高了28％,断后伸长率提高了8．6％,硬度提高了8HRC。此外,磁场淬火还提高了T10钢的抗回火能力,这是由于磁场淬火后的钢中含有大量弥散碳化物所致。     

磁场淬火工艺及设备

<正> 一、概 况 在磁场的作用下用于改善各种金属材料力学性能的热处理方法称为磁场热处理。此理论1959年由美国的RDCA(美国开发与研究公司)的总冶金师Bassett最先提出的,故称为贝氏法。磁场热处理分为磁场退火、磁场加热淬火、磁场淬火、磁场回火及磁场氮化。磁场热处理最突出的特点是细化组织,在硬度及韧性稍有提高的情况下,可显著的提高材料强度,增加其耐磨性。该方法是将普通加热的工件投入通以磁场的淬火介质中进行淬火冷却的一种热处理方法。φG系列磁场淬火槽就是为了在生产及科研中实现磁场淬火的装置。     

磁场淬火槽的设计和应用

试验用磁场淬火槽,其磁场强度值为236 363.6 A/m,已成功地用于磁场淬火工艺试验。在此基础上研发的ΦG300/1000型工业用磁场淬火装置6,年左右的使用表明,经该设备淬火的冷冲模具的使用寿命比经普通淬火的冷冲模具平均提高了0.5～2倍。     

淬火冷却技术的发展及应用

综述了淬火冷却技术的最新发展概况,对磁场淬火技术、强烈淬火技术、超声波淬火技术、淬火冷却计算机模拟技术和控制冷却技术的原理及应用进行了介绍和概述,并对淬火冷却技术的发展趋势进行了展望。     

磁场对残余奥氏体转变的影响

本文研究了交变磁场对钢中残余奥氏体转变的影响。实验结果表明,在磁场下淬火和回火,使马氏体弥散度增加,残余奥氏体数量减少,碳化物颗粒细化。对于GCr15和CrMn钢,在磁场下淬火及回火,可相当于-80℃的冷处理。     

磁场条件下不同组织45钢摩擦磨损性能研究

研究了磁场条件下不同组织45钢的摩擦磨损性能。结果表明,无论是退火45钢还是淬火45钢,在一定磁场范围内都能使摩擦系数减少,磨损率降低。退火45钢受磁场影响较大,而淬火45钢受磁场影响较小。二者磨损机制均为无磁场时主要为磨粒磨损,有磁场时主要为粘着磨损。     

磁场热处理及其应用和发展前景

简述了磁场热处理使钢强化的机制和强化效果 ,并将其与普通形变热处理作了比较。介绍了冷冲模的磁场淬火和高速钢的磁场回火等应用情况 ,展望了磁场热处理的发展前景。     

最佳磁场淬火工艺的探讨

试验证明，在磁场淬火工艺中，采用交流磁场效果较好，而且随磁场强度的增大，效果愈好。在碳素钢中，含碳量小于0．2％者不宜采用磁场淬火工艺，含碳量在0．4％以上者效果最佳，对于合金钢，凡是含有能使Fe-C状态图共析点左移的合金元素的钢均适用磁场淬火工艺，用抗磁材料制作的磁场淬火夹错效果最佳。     

25MnVK钢磁场热处理工艺研究

在用普通热处理的方式制造25MnVK钢高强度圆环链时存在着变形不均、使用寿命不太理想的问题,但磁场热处理可有效改善这些问题。因此,将25MnVK钢在800℃下淬火、200℃下回火时分为两组,分别进行普通热处理和磁场热处理,区别是磁场热处理在淬火过程用充磁机对淬火槽充磁后再淬火。采用金相显微镜、硬度计等观察和检测25MnVK钢的组织和力学性能。结果表明,磁场热处理能改善25MnVK钢的力学性能,尤其是强韧性效果,并且可改善马氏体的组织。     

复合物理场热处理——磁场热处理

介绍了磁场热处理的原理。论述了磁场对铁基合金相变热力学、相变过程和相变产物的影响。评述了经磁场退火、磁场淬火和磁场回火处理的结构钢、工具钢、低铬耐磨铸铁等材料的组织和性能以及产生磁场的方法及磁场热处理的工程应用和存在的问题。     

静磁场对32CrMnNbV淬透性及耐蚀性能的影响

研究了静磁场（０－１．２Ｔ）对３２ＣｒＭｎＮｂＶ淬透性及蚀性能的影响。实验中发现,在连续冷却过程中加磁场,可以使铁索为的ＣＣＴ曲线左移,淬透性下降;在奥氏体化咖磁场。会降低奥氏体的稳定性,造成冷却过程中ＣＣＴ曲线的左移,而且左移的趋势更明显,当淬火时所加磁场的强度增加到１．２Ｔ,马氏体组织明显细化。此外,磁场下淬火可以提高马氏体的蚀性。随着外磁场的增加,腐蚀速率下降。     

NUMERICAL SIMULATION OF TEMPERATURE FIELD DURING MAGNETIC FIELD QUENCHING

1. Introduction As an applied computer science, numerical simulation makes much account of quenching process in heat treatment field. The computer simulation in quenching process has already extended to three-di- mension model. Both sample's thermal physi…     

Effect of Stable Magnetic Field on the Phase Transformation of Sr3 Steel

The experimental equipment designed by the author was used to carry out quenching treatments on Sr3 steel,with and without magnet it field in different quenching mediums. The effect of steady magnetic field on the phase transformation of Sr3 steel was studied by metallographic microscope and scanning electron microscope. The result shows: the application of magnetic field can obviously increase the volume fraction of ferrite during the austenite to ferrite transformation of Sr3 steel, promote the ferrite grains refining and homogenization, and get the pearlite beam much homogeneously and much compact, when Sr3 steel is quenched in the water.     

磁场深冷处理对合金钢力学性能的影响

对4Cr13、65Mn、60Si2Mn三种工业用钢分别进行了常规淬火、深冷处理和磁场深冷处理，并对经处理后的试样进行了力学性能测试。试验结果表明，深冷处理能提高钢的硬度、强度、冲击韧度和耐磨性，而磁场深冷处理的强韧化效果又明显超过常规深冷处理的。     

Magnetic properties and time-temperature stability of properties of on iron-and cobalt-based amorphous and nanocrystalline alloys with a destabilized domain structure

Magnetic properties of amorphous and nanocrystalline alloys with a saturation magnetostriction close to zero and a destabilized magnetic domain structure have been studied. A change in the magnetic characteristics has been investigated after two treatments leading to a destabilization of the domain structure: magnetic annealing in a high-frequency magnetic field of 80 kHz and quenching in water. It has been shown that the destabilization by both the first and the second methods markedly improves magnetic properties of amorphous alloys. Nevertheless, upon quenching of amorphous alloys a time-temperature instability of the magnetic properties has been observed. The quenching in water of the nanocrystalline alloys under study results in a deterioration of the magnetic properties.     

Microstructure refinement of AZ31 alloy solidified with pulsed magnetic field

The effects of a pulsed magnetic field on the solidified microstructure of an AZ31 magnesium alloy were investigated. The experimental results show that the remarkable microstructural refinement is achieved when the pulsed magnetic field is applied to the solidification of the AZ31 alloy. The average grain size of the as-cast microstructure of the AZ31 alloy is refined to 107 μm. By quenching the AZ31 alloy, the different primary α-Mg microstructures are preserved during the course of solidification. The microstructure evolution reveals that the primary α-Mg generates and grows in globular shape with pulsed magnetic field, contrast with the dendritic shape without pulsed magnetic field. The pulsed magnetic field causes melt convection during solidification, which makes the temperature of the whole melt homogenized, and produces an undercooling zone in front of the liquid/solid interface, which makes the nucleation rate increased and big dendrites prohibited. In addition, the Joule heat effect induced in the melt also strengthens the grain refinement effect and spheroidization of dendrite arms.