CN1091155C - 用磁场进行钢材离线热处理的方法 - Google Patents

用磁场进行钢材离线热处理的方法 Download PDF

Info

Publication number
CN1091155C
CN1091155C CN99103160A CN99103160A CN1091155C CN 1091155 C CN1091155 C CN 1091155C CN 99103160 A CN99103160 A CN 99103160A CN 99103160 A CN99103160 A CN 99103160A CN 1091155 C CN1091155 C CN 1091155C
Authority
CN
China
Prior art keywords
magnetic field
steel
add
cooling
austenitizing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN99103160A
Other languages
English (en)
Other versions
CN1234450A (zh
Inventor
杨钢
冯光宏
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Central Iron and Steel Research Institute
Original Assignee
Central Iron and Steel Research Institute
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Central Iron and Steel Research Institute filed Critical Central Iron and Steel Research Institute
Priority to CN99103160A priority Critical patent/CN1091155C/zh
Publication of CN1234450A publication Critical patent/CN1234450A/zh
Application granted granted Critical
Publication of CN1091155C publication Critical patent/CN1091155C/zh
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Landscapes

  • Heat Treatment Of Articles (AREA)

Abstract

本发明属于钢材的离线热处理领域。主要适用于钢材依赖扩散性相变热处理时奥氏体化后的冷却过程。本发明所述的用磁场进行钢材离线热处理方法包括使用稳定磁场和脉冲磁场，在钢材奥氏体化后的冷却过程中发生相变时加入磁场，处理一段时间。经本发明进行热处理，钢材可以获得细小的晶粒组织，提高强度以及获得均匀的组织。

Description

用磁场进行钢材离线热处理的方法
本发明属于钢材的离线热处理领域。主要适用于钢材依赖扩散性相变热处理(获得铁素体---珠光体组织)时奥氏体化后的冷却过程。
目前，国内外对磁场对钢材热处理时的作用研究主要集中在用高强度脉冲磁场提高钢材淬火过程中钢的Ms点，增加马氏量，提高钢材的强度。国外对这方面的研究报道较多，主要文献可参见“Magnetic field-inducedmartensitic transformation in a few feerrrous alloys”(Journal ofmagnetism and Magnetic Materials 90 & 91(1990)34-36)，其主要特征是在淬火(或等温淬火)条件下，加入高强度脉冲磁场可得到更多的马氏体，提高强度。稳定磁场对钢材热处理的作用未见报导，而且磁场(稳定磁场或脉冲磁场)对钢材热处理时扩散性相变的作用也未见报导。
本发明的目的在于提供一种能够细化铁素体—珠光体组织、提高钢材强韧性及改善组织均匀性的钢材磁场离线热处理方法。
针对上述目的，本方法是钢材在奥氏体化后的非强制冷却过程中发生γ-α相变前，把钢材置于均匀的磁场中，对其进行离线热处理，所述磁场指稳定磁场(静磁场)或脉冲磁场，其具体的工艺参数如下；
采用稳定磁场：钢材在奥氏体化后的非强制冷却过程中发生γ-α相变前加入稳定磁场，磁场强度应大于0.8特斯拉，从发生相变点开始加磁场的有效时间不少于3秒。
采用脉冲磁场：钢材在奥氏体化后的非强制冷却过程中发生γ-α相变前加入脉冲磁场，脉冲磁场强度应大于1.5特斯拉，脉冲频率不低于0.5Hz，从发生相变开始加磁场的有效时间不少于5次脉冲时间。
在钢材热处理时奥氏体化后的冷却过程中加入磁场(稳定磁场或脉冲磁场)，能够显著地增加形核密度，细化组织，提高钢材的强韧性，改善组织均匀性，其原因是待处理钢材在磁场下产生Zeeman效应、高场磁化率和磁致伸缩效应，因此，在磁场的作用下，相变驱动力增大，导致临界晶核尺寸和临界形核功均减少，显著地增加了待处理钢材各处的形核密度。这样，形核密度的显著增大，可以使铁素体---珠光体组织的显著细化，导致了钢材的强韧性，也使待处理钢材的表面和芯部的硬度差别减小，提高了钢材的组织均匀性。
现结合附图对本发明进一步说明。
附图1为本发明的工艺流程示意图。
附图2为本发明稳定磁场热处理装置示意图。
附图3为本发明脉冲磁场热处理装置示意图。
附图1中，A为毛坯库，B为加热炉，C为磁场热处理，D为冷床。
附图2、3中，1、5为线圈，2、7为待处理钢材样，3为固定钢样夹具，4为铁芯，6为绕线圈用的陶瓷环。
待处理钢材毛坯在加热炉奥氏体化保温后放入磁场装置中，放入均匀磁场的中间，用夹具3固定(见附图2和3)，待温度降至AC3(或稍高)点时通入磁场，加磁场的持续时间依技术要求而定，处理完后移至冷床放置。
本发明具有如下优点：
(1)加磁场的结果，金相组织得到了显著细化；
(2)提高钢材的强韧性；
(3)改善组织均匀性。
实施例
根据本发明所述的磁场离线热处理方法，采用X60管线钢为坯料进行三批磁场热处理试验，奥氏体化温度为1000℃，保温时间为20min，放入磁场中空冷，磁场工艺参数见表1，力学性能试验及金相检验结果如表2所示。
表1、实施例磁场热处理的工艺参数
表2、实施例磁场热处理后的抗拉强度及晶粒尺寸
Figure C9910316000051

Claims (1)

1、一种用磁场进行钢材离线热处理的方法，其特征在于：在钢材奥氏体化后的非强制冷却过程中发生γ-α相变前，把钢材置于均匀的磁场中，对其进行离线热处理，所述磁场指稳定磁场<静磁场>或脉冲磁场，其具体的工艺参数如下：
(1)采用稳定磁场：钢材在奥氏体化后的非强制冷却过程中发生γ-α相变前加入稳定磁场，磁场强度应大于0.8特斯拉，从发生相变开始加磁场的有效时间不少于3秒；
(2)采用脉冲磁场：钢材在奥氏体化后的非强制冷却过程中发生γ-α相变前加入脉冲磁场，脉冲磁场强度应大于1.5特斯拉，脉冲频率不低于0.5Hz，从发生相变开始加磁场的有效时间不少于5次脉冲时间。
CN99103160A 1999-03-24 1999-03-24 用磁场进行钢材离线热处理的方法 Expired - Fee Related CN1091155C (zh)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN99103160A CN1091155C (zh) 1999-03-24 1999-03-24 用磁场进行钢材离线热处理的方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN99103160A CN1091155C (zh) 1999-03-24 1999-03-24 用磁场进行钢材离线热处理的方法

Publications (2)

Publication Number Publication Date
CN1234450A CN1234450A (zh) 1999-11-10
CN1091155C true CN1091155C (zh) 2002-09-18

Family

ID=5271142

Family Applications (1)

Application Number Title Priority Date Filing Date
CN99103160A Expired - Fee Related CN1091155C (zh) 1999-03-24 1999-03-24 用磁场进行钢材离线热处理的方法

Country Status (1)

Country Link
CN (1) CN1091155C (zh)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1317096C (zh) * 2003-05-27 2007-05-23 上海大学 一种细化铸铁晶粒的方法
CN100449009C (zh) * 2007-04-17 2009-01-07 武汉晶泰科技有限公司 电磁场在提高金属材料寿命上的应用
CN105478520B (zh) * 2015-12-15 2017-05-10 东北大学 结合磁场热处理制备纳米级多层金属基复合材料的方法
CN105755272B (zh) * 2016-05-12 2017-09-26 北京科技大学 一种应用脉冲磁场实现硬线盘条在线时效装置及处理方法
CN111378812B (zh) * 2020-04-08 2021-03-23 上海大学 一种提高金属锯齿形晶界比例的热处理方法和该热处理方法所用的热处理系统

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW257870B (en) * 1995-04-11 1995-09-21 Ind Tech Res Inst Heat treatment method of amorphous soft magnetic material product

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW257870B (en) * 1995-04-11 1995-09-21 Ind Tech Res Inst Heat treatment method of amorphous soft magnetic material product

Also Published As

Publication number Publication date
CN1234450A (zh) 1999-11-10

Similar Documents

Publication Publication Date Title
Jurči et al. Characterization of microstructure and tempering response of conventionally quenched, short-and long-time sub-zero treated PM Vanadis 6 ledeburitic tool steel
US5885370A (en) Method of heat treatment of steel
KR100665443B1 (ko) 복상 조직강의 조직제어방법
CN1091155C (zh) 用磁场进行钢材离线热处理的方法
CN113957209A (zh) 一种高碳铬轴承钢强磁场快速球化退火工艺
Prisco Case microstructure in induction surface hardening of steels: an overview
Wu et al. A model for rapid austenitization in steel with ferrite and pearlite microstructure under electropulsing
Singh et al. Monitoring the microstructural changes of heat treated medium carbon steel by Barkhausen noise and hysteresis loop techniques
Kayali et al. The development of fine structure superplasticity in cast ultrahigh carbon steels through thermal cycling
CN103333995A (zh) 一种超声波辅助淬火的工艺方法及装置
Weng et al. Cryogenically martensitic transformation and its effects on tempering behaviors of bearing steel
Delia et al. Effect of austenitizing conditions on the impact properties of an alloyed austempered ductile iron of initially ferritic matrix structure
Wu et al. Investigation on grain refinement and precipitation strengthening applied in high speed wire rod containing vanadium
Kim et al. Graphitization behavior of medium-carbon high-silicon steel and its dependence on temperature and grain size
Hunkel et al. Size change due to anisotropic dilation behaviour of a low alloy sae 5120 steel
RU2107101C1 (ru) Способ термической обработки металла и.и.максимова
Wang et al. Effect of decarburisation and nitriding on the carbon content, precipitates, microstructure and texture of Nb-bearing grain-oriented silicon steel
Yang et al. The inspection of spheroidized annealing on SCM435 cold-forging quality steel wires with protective atmosphere
Soliman et al. Multiphase ausformed austempered ductile iron
Grünberger et al. High-strength pearlitic steel–copper composite wires for conductors in pulsed high-field magnets
Ohtsuka et al. Effects of magnetic field and prior austenite grain size on the structure formed by reverse transformation from lath martensite to austenite in an Fe-0.4 C alloy
Błaż et al. Interaction of phase transformation and deformation process during hot deformation of 0.16% C steel
Lin et al. Influence of austenitizing temperature on stress corrosion in 4330m steel—The role of impurity segregation in stress corrosion cracking of high strength steel
CN111154956A (zh) 一种中碳低合金钢的热处理方法
US3615925A (en) Heat-treatment of steels

Legal Events

Date Code Title Description
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C06 Publication
PB01 Publication
C14 Grant of patent or utility model
GR01 Patent grant
C19 Lapse of patent right due to non-payment of the annual fee
CF01 Termination of patent right due to non-payment of annual fee