过时效温度对连续退火制备DP1180钢组织性能的影响

通过扫描电镜(SEM)、X射线衍射(XRD)和室温拉伸等技术对DP1180钢的微观结构和力学性能进行了表征。结果表明,冷轧退火后钢的微观组织主要由铁素体(F)、马氏体(M)和少量贝氏体组成。在230℃过时效处理时,马氏体主要呈板条状,铁素体呈多边形,粒状贝氏体含量较少。随着过时效温度的升高,板条状马氏体含量减少,粒状贝氏体增加,碳化物明显增加。随过时效温度的不断上升,抗拉强度降低,伸长率增加。过时效温度为270℃时,抗拉强度为1255.0 MPa,伸长率为11.39%,强塑积为14.29 GPa·%,综合力学性能最佳。DP1180钢的合理的过时效温度区间为230～306.8℃。     

医用稀土镁合金微观组织特征及力学行为研究进展

近年来,镁合金作为生物医用金属材料受到了广泛关注,但其较差的力学强度极易导致植入物在服役周期内崩塌断裂,严重危及患者生命安全。稀土微复合金化作为当下提高可降解镁合金力学性能的有效措施,在消除镁合金杂质元素、净化熔体的同时,还可以起到促进动态再结晶、形成长周期堆垛有序相等作用。因此,本文从稀土镁合金微观结构转变及其与力学性能的基本关联出发,综述了近年来医用稀土镁合金组织特征及力学性能的研究进展,深入发掘了稀土元素、第二相及镁合金力学性能之间的本质关联,详细阐述了连续动态再结晶对稀土镁合金的强韧化机理,全面叙述了稀土元素诱导长周期堆垛有序结构对镁合金力学性能的影响规律。最后,本文对医用稀土镁合金未来的发展方向进行了展望。     

Multiphase microstructure and property of low carbon bainite/ferrite steel by quenching and carbon partitioning

The multiphase microstructure and properties of low carbon steel by IQ&PB process under different partitioning temperatures and time were studied by means of SEM, EPMA, XRD and tensile testing. Results show that the microstructures of experimental steel consist of ferrite, bainite and retained austenite. With the increase of the holding time in two- phase region, the C and Mn contents apparently increase in martensite which transformed from austenite, and C and Mn content are 1. 47 times and 1. 16 times than average value of the base. With the decrease of the quenching and partitioning temperature, the volume fraction of the bainite increases, the microstructure is refined, and the content of M/A islands increases. With the temperature and time increased, the volume fraction of retained austenite at room temperature increases, the tensile strength decreases, the total elongation increases, and work hardening behavior occurrs continuously. When the partitioning time is 30min and the partitioning temperature is 400??, the tensile strength of the steel is 1107MPa, the elongation is 24%, the product of strength and elongation reaches above 26568MPa??%.     

低碳高强舰船用钢的CCT曲线及其组织性能

采用Gleeble-3500热模拟试验机、光学显微镜和扫描电镜等研究了低碳高强舰船用钢的连续冷却转变曲线(CCT曲线)及热轧后终冷温度对组织性能的影响。结果表明,试验钢连续冷却转变只发生了铁素体、贝氏体相变。试验钢轧后快速冷却至不同终冷温度立即空冷工艺下,室温组织主要为贝氏体和多边形铁素体,且随着终冷温度降低,贝氏体的含量增多。与直接空冷至室温相比,随着终冷温度提高,试样的强度呈先降低后增加趋势,然而,终冷温度提高到650 ℃时,试样强度却降低。终冷温度为600 ℃时,屈服强度和抗拉强度最高,分别为644.28 MPa和为679.71 MPa,－20 ℃的冲击吸收能量最优,为112 J。     

基于相变产物构建DP1180相变动力学方程研究

摘要：DP1180钢相变动力学方程的构建,有利于其力学性能的精准调控。利用Gleeble 3500对DP1180钢进行相变点测定,结合切线法、金相 硬度法研究了DP1180钢在冷却过程中的显微组织演变规律,绘制连续冷却转变曲线(CCT),并基于相变产物对相变动力学方程（JMAK方程）进行了修正。结果表明：冷速为0.5~1℃/s时,组织为铁素体(F)和贝氏体(B);冷速为2℃/s时,有马氏体(M)出现;冷速为10℃/s时,组织为贝氏体(B)和马氏体(M);冷速大于20℃/s时,组织以马氏体(M)为主;显微硬度随冷速的增加而升高;基于不同相变产物对n值的影响规律,对传统JMAK方程进行修正,构建了基于相变产物的相变动力学方程,预测精度得到提升。     

微合金元素Cu及等温温度对低碳硅锰钢氢扩散行为的影响

目的探究微合金及热处理工艺对氢扩散的影响。方法设计含0.4%Cu及未含Cu的两种低合金钢,采用两相区保温-淬火-配分(IQP)热处理工艺获得280、400℃等温温度的试验钢,通过SEM、EBSD、电化学氢渗透等方法分析其氢扩散行为。结果对于无Cu钢,当等温温度为280℃时,大角度晶界占比55%,残余奥氏体(RA)体积分数约为0.02%,氢扩散系数约为1.82×10-7cm2/s;当等温温度为400℃时,大角度晶界占比51%,RA体积分数约为0.35%,氢扩散系数约为1.30×10-7 cm2/s。对于含0.4%Cu的低合金钢,等温温度为280℃时,大角度晶界占比46%,RA体积分数约为0.15%,氢扩散系数约为2.70×10-7 cm2/s;贝氏体区等温温度为400℃时,大角度晶界占比33%,RA体积分数约为3.00%,氢扩散系数约为0.40×10-7 cm2/s。结论微合金元素Cu的添加,导致晶粒度的细化,大角度晶界占比更低,RA含量更高,从而其氢扩散系数更低,不利于氢扩散行为的发生。当等温温度由280℃升到400℃时,虽然会导致晶粒粗化,但大角度晶界占比更低,且RA含量更高,同样会降低其氢扩散系数,不利于氢扩散行为的发生。由此可知,含0.4%Cu、等温温度为400℃时,IQP钢的氢扩散能力最差。     

Sliding wear behaviour of T6 treated A356–TiB2 in-situ composites

Dry sliding wear behaviour of A356–TiB₂ composites in T6 condition was tested using a pin-on-disc wear testing machine. The composites were prepared by the reaction of a mixture of K₂TiF₆ and KBF₄ salts with molten alloy. The wear tests were conducted at normal loads of 19.6–78.4 N and a sliding speed of 1 ms^?1. A detailed SEM study of wear surface and debris was carried out to substantiate the wear results. The results indicate that wear rate of the composites is a strong function of TiB₂ content rather than overall hardness of the composite. The role of Si and TiB₂ particles towards the overall mechanism has been discussed.     

C和Mn元素配分行为对冷轧中锰TRIP钢组织性能的影响

采用冷轧+两相区温轧退火（CR+WR+IA）热处理工艺，研究了两相区退火时间对超细晶铁素体与奥氏体中组织形貌演变、C和Mn元素配分行为以及力学性能的影响。结果表明，冷轧试验钢经两相区形变退火处理后，获得了由铁素体、残余奥氏体或新生马氏体组成的超细晶复相组织。在645℃随退火时间的延长，形变马氏体向逆相变奥氏体配分的C、Mn元素增多，C、Mn元素富集位置增加，同时富Mn区形变马氏体回复再结晶现象明显；伴随少量碳化物溶解，试验钢的屈服强度由741持续降低到325MPa。两相区退火10min时，试验钢力学性能最佳，此时抗拉强度达到最大值1141MPa，断后伸长率及均匀伸长率分别为236%和181%，强塑积达到26928MPa·%。     

Ultra-fine-Grained Ferrite Prepared from Dynamic Reversal Austenite During Warm Deformation

The ultra-fine-grained ferrite(UFGF) with the size of less than 1 μm is often difficult to be obtained for low-alloyed steel in practical production processing.In this study,considering the rod and wire production process,a new method for preparing the UFGF with submicron scale is proposed by warm deformation of six passes with total strain of 2.6,followed by the cooling process in Gleeble-3500 thermo-mechanical simulator.The results show that the UFGF with an average size of 0.64 μm could be obtained via the phase transformation from austenite grains with an average size of 3.4 μm,which are achieved by the deformation-induced reversal austenization during the high strain rate warm deformation.The main driving force for the reversal transformation is the stress.And the interval between the passes also plays an important role in the reversal austenization.     

Influence of laser surface texturing on the flexural strength of Al2O3 and Si3N4

Laser surface texturing (LST) is well known to be capable of improving the tribological performance and reducing the friction of ceramic surfaces. However, the influence of LST on the flexural strength of ceramics has rarely been researched.In this study, we examine the influence of LST on high purity (> 99.5 wt%) dense-sintered fine Al₂O₃ and hot-pressed fine Si₃N₄ with polished and laser-textured surfaces based on the biaxial ball-on-3-balls (B3B) test. A heat transfer simulation of the LST process is performed to understand the occurrence of residual stress. In addition, the B3B strength of Al₂O₃ and Si₃N₄ texture groups is calculated by adapting the previous formula based on the finite element (FE) simulation. Subsequently, the stress distribution in the FE simulation is used to calculate the effective volume and effective surface to study the size effect on both ceramics. It is found that LST improves the strength of Al₂O₃ and Si₃N₄ due to two reasons: it induces compressive residual stress on the tensile-loaded surface of ceramic specimens; more importantly, it reduces the effective volume and effective surface remarkably, thus improving the component strength significantly.