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Effect of Composition and Processing Parameters on the Formation of Nano-Bainite in Advanced High Strength Steels

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Journal of Iron and Steel Research International 2011年第S1期18卷 238-241页

作者： ilana timokhina Hossein Beladi Peter Hodgson Centre for Material and Fibre Innovation Deakin UniversityGeelongVIC 3217

The nano-bainitic microstructures were compared in a 0.79C-1.5Si-1.98Mn-0.24Mo-1.06Al (wt%) steel after isothermal heat-treatment and a Fe-0.2C-1.5Mn-1.2Si-0.3Mo-0.6Al-0.02Nb (wt%) steel after controlled thermomechanical *** microstructure for both steels consisted of *** microstructural characteristics of bainite,such as the morphology of the nano-bainite and thicknesses of bainitic ferrite and retained austenite layers,as a function of steel composition and processing was studied using transmission electron microscopy (TEM).It was found that the nano-bainitic structure can be formed in the low alloy steel through thermomechanical *** probe tomography (APT) was employed as a powerful technique to determine local composition distributions in three dimensions with atomic *** important conclusions from the APT research were that the carbon content of bainitic ferrite is higher than expected from paraequilibrium level of carbon in ferrite for both steels and that Fe-C clusters and fine particles are formed in the bainitic ferrite in both steels despite the high level of Si.

关键词： nano-bainite transmission electron microscopy atom probe tomography carbon content

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双相钢的局部激光热处理

热处理技术与装备 2012年第1期33卷 41-41页

作者： Mehdi Asadi Georg Frommeyer Ali Aghajani ilana timokhina Heinz Palkowski

本项研究的处理工艺可以强化热轧双相(dual-phase DP)钢。为此研究了一种能达到局部强化的方法,即局部激光热处理(laser heat treatment LHT)。DP钢板以不同程度的预应变,用冷轧随后激光热处理达到整体而均匀的变形。经选择各种参数进... 详细信息

本项研究的处理工艺可以强化热轧双相(dual-phase DP)钢。为此研究了一种能达到局部强化的方法,即局部激光热处理(laser heat treatment LHT)。DP钢板以不同程度的预应变,用冷轧随后激光热处理达到整体而均匀的变形。经选择各种参数进行此项处理后,用光学显微镜(LOM)、扫描电镜(SEM)、透射电镜(TEM)、硬度测量和拉伸试验来评估热处理区的表面和横截面的显微组织,以及力学性能。结果说明用局部热处理能得到局部高强度。在较低的处理温度,这种效应可认为是烘烤强化(bake hardening BH),增加预应变和温度,从而提高局部性能。随着处理温度增加影响表面附近的初始组织。用激光局部强化DP钢开辟了一个新的领域,应用于把强化效应用到只影响感兴趣的相关区域,因此提供了节能的潜力和能设计零部件的性能。

关键词：激光热处理双相钢局部强化力学性能显微组织光学显微镜局部热处理扫描电镜

The Evolution of Ultrafine Grained Structure Formation Through Isothermal Static Phase Transformation

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Journal of Iron and Steel Research International 2011年第S1期18卷 218-222页

作者： HOSSEIN Beladi ilana B timokhina SUBRATA Mukherjee PETER D Hodgson Centre for Material and Fibre Innovation Deakin UniversityGeelongAustraliaVic 3216

In the current study,a 0.3C-2Si-2Mn-0.28Mo (in wt%) steel with high hardenability was deformed at a relatively low temperature followed by isothermal static phase *** novel thermomechanical processing made it possible to successfully produce an ultrafine ferrite grained structure (～2 μm) in the absence of both dynamic phase transformation and controlled *** use of a model Ni-30Fe austenitic alloy showed that the low temperature deformation induced very fine intragranular defects throughout the microstructure,which would then act as fine spaced ferrite nucleation sites at an early stage of phase *** a result,the coarsening of ferrite was extremely limited during isothermal phase transformation,resulting a very fine ferrite grained structure;even nanoscale in the region of the prior austenite grain boundary.

关键词： ultrafine ferrite warm deformation isothermal phase transformation substructure

Effect of Thermo-Mechanical Processing on Precipitate Formation in Next Generation HSLA Steel

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Journal of Iron and Steel Research International 2011年第S1期18卷 478-481页

作者： Mukherjee S timokhina I B Ringer S P Hodgson P D Centre for Material and Fibre Innovation Deakin UniversityGeelongVic 3217Australia Australian Key Centre for Microscopy and Microanalysis University of SydneyNSWAustralia

Development of advanced high strength steels (AHSS) using a conventional rolling setup is one of the biggest challenges to steel *** has been found that fine precipitation in a soft matrix,formed after hot rolling,can markedly improve the mechanical *** this work,three dimensional atom probe tomography (3D-APT) has been used to study the formation of precipitates in thermomechanically simulated steel.3D-APT data reveals co-existence of numerous nano clusters with ***,quantitative analysis of the nano clusters and precipitates shows clusters are as small as 1nm in *** are found to be disc shaped with the composition of equilibrium precipitates (TiMo)***,3D-APT is seen as an ideal technique to complement TEM to understand the nanoscale features in thermomechanically processed steel for further improvements in the mechanical properties of AHSS.

关键词： TMCP 3D-APT precipitate cluster

热机械加工工艺的形变制度对C-Si-Mn相变诱导塑性钢显微组织和机械性能的影响

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现代冶金（内蒙古） 2015年第3期 7-14,78页

作者： I.B.timokhina 乔林锁高志国澳大利亚

用热扭转机械对热机械加工工艺进行了模拟，目的是开发一种能大众化理解的在再结晶和非再结晶奥氏体区中一些形变对0．2％C-1．55％Mn-1．5％Si相变诱导塑性（TRIP）钢显微组织变化和机械性能影响，形变制度影响多相TRIP钢显微组织（多... 详细信息

用热扭转机械对热机械加工工艺进行了模拟，目的是开发一种能大众化理解的在再结晶和非再结晶奥氏体区中一些形变对0．2％C-1．55％Mn-1．5％Si相变诱导塑性（TRIP）钢显微组织变化和机械性能影响，形变制度影响多相TRIP钢显微组织（多边形铁素体、不同形貌的贝氏体、残余奥氏体和马氏体）的所有组成，在显微组织中存在的所有相的形貌和分布及残余奥氏体体积分数与TRIP钢机械性能间有复杂的关联，贝氏体形貌比显微组织细化对机械性能产生更大的影响，通过调整残余奥氏体体积分数比显微组织整体细化更能改善TRIP钢的机械性能。

关键词：相变诱导塑性钢机械加工工艺机械性能显微组织形变 TRIP钢残余奥氏体体积分数