Application of the computer-aided quenching technology on the connecting bar of 42CrMo4

In order to obtain the desired mechanical properties of connecting bar after quenching and tempering, and reduce the cracking tendency and distortion, a program of controllable quenching was established. Furthermore, a computer-aided quenching (CAQ) system was developed. The applications show satisfactory results.     

低碳双相钢的二次淬火工艺研究

研究了20SiMnTi钢经过不同热处理工艺处理，分析随亚湿淬火温度的变化，材料的组织和力学性能的变化规律，热处理可以使材料得到良好的强塑性配合。其抗拉强度达到950MPa，屈服强度达到920MPa，伸长率为205，断面收缩率为53．4％。     

锥齿轮淬火机械手装置的总体结构设计

本文所研究的淬火机械手要求完成锥齿轮在热处理线上从恒温渗碳炉到淬火压床间的送料和上料动作，严格控制锥齿轮在空气中的裸露时间，准确地夹取工件。本文着重讨论了该机械手装置的总体结构设计和工作原理。     

Computer Prediction on Stress Distribution During Laser Quenching

IntroductionInprocessofindustry,theproblemscoupIedwiththermaIandfOrceareusuaIIymet.LaserqueIlchinginvolvingphasetransformationisoneofthem.HowtosetupafitmatheInatica1modeltosimulatetl1elaserquenchingprocessandhowtocalculateandanalyzenumericallythestresgdistributionarefolIowedwithinterestbymanyresearchersIl'2'3J.Thoseeffol'tsareimportanttooPtilnizethetechnologyparametersandprovideareliablebasisforimprovingthesyntheticallymechanicspropertiesandtheuseagesofmaterials.Alongwithdevelopmentofcomp…     

Numerical Analysis of Thermal Distortion and Residual Stresses in H13 Steel Due to Vacuum Gas Quenching

IntroductionVacuumgasquenchinginvolvinghighpressuregasasacoolingmedium,is.anincreasinglypoPularheattreatffienttechniquefor1argesteeldieblocks,forexamPleHl3die.ItisconsideredessefltialtounderstandthentheeofthegasflowandtheinfiuencethishasontemPeratureprofilesandresultaflresidualstresseswithintheheattTeatedcomPonent.SimulatingthisprocessinvolvesthesimulationofgasflowinthefurnaceaswellasthesimulationofthethermalbehaviourofthecomPoneni.However,thereisnosinglecomPatersoftwarepackageavailabletot…     

热处理件调质工艺CAPP软件系统的开发

为了提高热处理件调质工艺的设计质量与设计效率,实现零件工艺卡片存档的计算机化管理,开发了其CAPP软件系统。使用本软件可代替人工编制柱状、套状、锥状、板状以及阶梯轴类零件的调质工艺,并由计算机管理存档工艺卡片及调质工艺基础数据库。     

高速钢带锯激光处理研究

通过一系列试验研究了高速钢带锯激光处理的工艺,并对经激光淬火后的试样的硬度及组织进行了研究．结果表明,高速钢带锯经过激光表面淬火后,马氏体和残余奥氏体的晶粒得到细化,碳化物减少,硬度得到显著提高,进而其耐磨性和使用寿命也得到提高．     

高速钢带锯激光处理研究

通过一系列试验研究了高速钢带锯激光处理的工艺，并对经激光淬火后的试样的硬度及组织进行了研究。结果表明，高速钢带锯经过激光表面淬火后，马氏体和残作奥氏体的晶粒得到细化，碳化物减少，硬度得到显提高，进而其耐磨性和使用寿命也得到提高。     

实时测温技术在调质热处理中的应用

热处理工艺参数对金属部件的组织和力学性能有显著的影响,以盘形工件淬火热处理为例,采用实时测温技术准确监控淬火热处理过程中工件的加热和冷却的温度-时间历程,并结合随炉试样的组织和力学性能,科学制定出热处理工艺规范,控制热处理工艺过程,稳定热处理质量,使工件性能满足了使用要求.     

Finite Differential Method Simulation on Temperature Field in Process of Laser Quenching

IntroductionInfieldoflasertreatment,laserquenchofmetalmaterialsisanimportantcourse.ItisahotspotinresearchoflaserquenchtocalculatetemperaturedistributionandtosimulatethecoursebymeansofcomputerThecalculationandanalogyisnotonlyabasistoca1culateinnerstressdistributionoflaserquenching,butalsoafoundationtooptimizelaserquenchingtechnologyandtocontrolquenchingcourse.Therearemanymethodstocalculatetemperature,suchasfiniteelementmethod(FEM),finitedifferentialmethod(FDM)andsoon.Accordingtodifferentpedi…     

使用时间对淬火介质冷却特性的影响

利用冷却特性测试仪对三种常用淬火介质进行性能测试,对冷却特性曲线以及热处理后的材料显微组织和性能进行分析,结果表明,正常使用一个月时间,N32机械油、水基高聚物淬火介质冷却能力下降,所处理试样的强度较低,而快速淬火油冷却能力提高,所处理试样的强度略高．     

Generalization of Results of Computations and Natural Experiments at Steel Parts Quenching

IntroductionThepaPerpresentsthegenera1izationofresultsofnumericalcomputationsandnaturalexperimentsbasedonthesimilaritytheoryandtheoryofregularthermalconditions.Thenumericalcomputationshasbeenmadeonthebasisofsolvingequationsofnon-stationarythermalconductivityandthermoplaSticity.Thegeneralizationofresultsliesinthefactthatwefoundadimensionlessformulaforthedeterminationofthetimeofreachingthemaximumcompressionstressesonthesurfaceofp8rtstobequenched.ThepatstobequenchedaredividedintothreegrouPs:pla…     

冷轧工作辊双频感应淬火工艺研究

针对冷轧工作辊的服役条件及对材质的要求,研究了冷轧工作辊的表面淬火工艺,对冷轧工作辊环裂产生的原因进行分析并采取相应措施减少了环裂的产生。     

车轴表面应力分析

为了提高车轴寿命,使车轴表面产生较大压应力,分析了50钢车轴表面残余应力变化规律,采用X射线法检测了车轴表层经过低温淬火和滚压后的轴向、周向和径向应力。测试结果表明,采用此方法后,车轴表面的残余应力大幅提高,最大增幅为556MPa,且应力分布均匀,说明此方法能够有效提高车轴的疲劳寿命。     

Modelling of high speed gas quenching

1ntroductionGaswimpfobe,usuallynitrOgen,mandheiumatposuresOfuPtO60barhasbousedinvacmbosfOrSendywtanditScharWshcsforbds-ofCOInNarewe1knOWUIl].More~theuseofgasq-aPPliedtOs~orsinglelayereOfCOmwtthawereheandindsvacuumorCOnwtalatmOSPherbohasboPrOpond(2l.TOathaatetheedtOCOOtheboacestruCtUrasweIIastheCOIntwIkeSechquesOboinvolvethetrareferOftheNttobeqMtoa~allydeaignedcoklchfortsl.6as~of~peinndsngmaybosoaS~the-ofbo'bds-Oha'pesstwfOr'juSb~'manwt.Unlikliquldbased~antS,gaswiiscleannO…     

热处理对高速钢红硬性的影响

用新研制的M2Si-3及M2Si-4研究了热处理对高速钢红硬性的影响。结果得出，提高淬火温度以增加溶入奥氏体中的碳化物以及在淬火后增加一次低温回火均可有效提高红硬性。但为通过淬火温度以提高红硬性，除必须提高钢料碳含量外还应设法细化碳化物。     

Research and Application Prospect of Computer Simulation on Heat Treatment Process

AseriesofgreatProgresseshavebeenachievedintheresearchofheattrCtoelltmathematicalmodelandcomPotersimulationduringrecellttenyears.ThecouPlingbforeentemPerthee-phasetransformation-stressl'-'],threedimensionalnon-linearFEManalysis[#-'],thecalculationofphasetransformationkinetics['-'],theeffectofstressonphasetransformationkineticsl,'-,,],thedealingwithabruPchangedboundnyconditionsl"#],thesimulationonfludfield["l,andotherinveshgationshavecarredout,andtheirachievementshaveProvidedasoundbasisfo…     

Timed quenching process for large-scale AISI 4140 steel shaft

The mechanical properties of AISI 4140 steel shaft with a diameter larger than 200 mm are difficult to meet the requirements and cracking occurs easily in water quenching, due to insufficient cooling ability of oil quenching. A new technology, named alternately timed quenching (ATQ), using water and air in turn as quenching media instead of oil or polymer aqueous solution, is applied to quench the large-scale AISI 4140 steel shaft. Two ATQ processes are determined with the aid of computer simulation first and the corresponding experiments are carried out consequently. The results show that the proposed technology can significantly reduce the surface cracking tendency and improve the mechanical properties in practical production of such large-scale shaft forgings.     

Sensitivity analysis of thermal properties on numerical simulation results of quenching process

A three-factor three-level orthogonal test project has been designed based on the numerical simulation of a Jominy quenching process. Then the data scattering effects of thermal conductivity and enthalpy of tested steel, as well as the heat exchange coefficients of the cooling media, on the results have been studied. The results can be used as a reference for choosing the input thermal parameter in finite element simulation of quenching, and for evaluating the simulation results.     

热处理对锰硼白口铁机械性能与显微组织的影响

研究了淬火、回火温度、冷却介质对锰硼白口铁机械性能及显微组织的影响。结果表明:淬火硬度随淬火温度提高出现峰值,峰值位置随淬火冷却速度增加向温度低的方向移动;回火硬度随回火温度升高在250℃出现峰值,回火温度高于480℃后硬度显著降低;残留奥氏体随回火温度升高而减少,430℃回火残留奥氏体基本消失,转变产物为贝氏体;淬火回火提高强韧性。