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通过对H13电炉大截面锻材球化退火料显微组织检验,横向室温拉伸和冲击韧性检验,五害和气体元素分析,并用北美压铸协会高级H13钢验收标准进行对比分析,显示材料球化殊光体呈细小均匀分布,见不到碳化物网和贝氏体针。显微带状偏析达到“优质”档次,轻微的偏析带上见不到链状一次碳化物。材料的五害和气体元素含量很低,材料延展性和韧性俱佳。大部分指标接近高级H13钢验收标准,综合水平与钢包精炼相当。 相似文献
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影响H13热作模具钢等向性的因素 总被引:1,自引:0,他引:1
通过显微组织和断口分析并与化学成分分析和力学性能测试相结合的方法,研究了H13钢铸态组织特征、碳化物类型和分布对等向性能的影响。结果表明:在冷却过程中,H13钢铸锭会产生严重的宏观元素偏析,在铸锭的个别区域,特别是最后凝固的中心区域,出现的少量不平衡亚稳定共晶碳化物、宏观偏析严重的铸态组织经变形而形成的带状组织、缓慢冷却形成的二次碳化物网是影响H13钢等向性的主要因素。 相似文献
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从凝固偏析理论、凝固方法、生产工艺及合金设计等方面,综述了H13钢中液析碳化物的研究进展,阐明了H13钢的生产工艺对液析碳化物析出的影响.H13钢中的液析碳化物是由于凝固偏析而在枝晶间区域产生的,根据形貌的不同可分为多边形、长条形、块状及共晶的层片状;根据结构不同可分为MC型、M6C型、M7C3或M23C6型;根据成分的不同可分为富Mo型、富V型和富Ti、Nb型.H13钢在服役过程中,受外力作用时会在液析碳化物处形成裂纹,严重降低材料的韧性,控制液析碳化物的数量和尺寸可以减小其危害.工业生产条件下控制H13钢中液析碳化物的主要手段有凝固控制、变质处理、铸锭高温扩散和合金成分优化等.其中凝固过程控制及变质处理可以控制液析碳化物的尺寸、数量及在凝固过程中的生成时机,但无法完全避免液析碳化物的产生.对H13钢进行合金成分优化可以改变液析碳化物的稳定性.铸锭高温扩散是控制H13钢中液析碳化物的最主要手段,但工业生产中采用的具体加热温度和保温时间有待进一步研究. 相似文献
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Compared with H13 steel, the influences of different heat treatment process on the microstructure and properties of the new type of hot working die steel H13MOD were studied. The results show that the complete austenitizing temperature of H13MOD is around 1030 °C and the quenching hardness achieves the maximum value at this temperature. While for H13, the complete austenitizing temperature is above 1100 °C and the quenching hardness rise constantly with the quenching temperature increasing. In quenching process, the undissolved MC carbides can prevent the coarsening of grain in both steels. With the rise of quenching temperature, when MC carbides dissolve completely, the grain grows quickly. The hardness and strength of H13MOD at higher tempering temperature (above 570 °C) are nearly the same as those of H13, but its toughness is higher than that of H13. Mo2 C carbide is the main strengthening phase in H13MOD, which is attributed to the higher content of Mo. The quantity of VC eutectic carbides is reduced because of lower content of V in H13MOD, which plays an important role in enhancing the impact toughness of H13MOD. Under a certain strength condition, H13MOD steel can be used in the environment that higher toughness is required and the service life of die casting mold can be improved. 相似文献
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M 2highspeedsteel (M 2steel)isamaterialwidelyusedintoolsanddies[1,2 ] .M 2steelischarac terizedbyalongsolidificationrangeandcomplexeu tecticreactions ,whichresultsinsegregationofalloy ingelementsandformationofseveraldifferenttypesofcarbidesduringsolidification[3,4 ] .Forconventionallyprocessedhigh speedsteels ,itisinevitablethatacoarsecarbidenetworkwillbeformedduringsolidifi cation .Coarseprimarycarbidestendtoresultinun evencarbidebandsdistributionafterasubstantialamountofhotprocessing[5] .Ma… 相似文献
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Influence of Thermal Homogenization Treatment on the Structure and Impact Toughness of H13 ESR Steel 总被引:1,自引:0,他引:1
Ma Dang-shen 《钢铁研究学报(英文版)》2009,16(5):56-56
High levels of isotropy and homogeneous structure are very important criterion for high quality H13 hot work steel. In this paper, the cast microstructure of H13 ESR ingot and the influence of high temperature diffusion treatment on the structure and impact toughness have been investigated. The results show that: the dendrite arm spacing gradually becomes wide from the surface to the center of ingot and the interdendritic segregation areas always exist large primary carbides particles; by means of high temperature diffusion treatment of ingot prior to hot forging, the banded segregation is nearly eliminated, the annealed structure is more uniform and the isotropy properties have been improved remarkably. 相似文献
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Overthepastdecades,extensivestudyontheadditionofrareearthelementsintohighspeedsteelhasbeencarriedout,andtheresultsshowthatrareearthelementshavefollowinginfluence[1~3]:alleviatingthesegregationofoxygen,sulphurandphosphorusalonggrainboundaries;increasingth… 相似文献