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锰对一种HSLA钢的组织和性能的影响 总被引:1,自引:0,他引:1
把一种含碳量为0.06%的低碳钢,通过真空感应熔炼把锰的含量由1.3%提高到2.0%,通过对未提高锰含量和提高锰含量之后的钢的组织和性能的比较,分析锰对一种低合金高强度钢的强化机理,并初步确定锰的强化方式,为综合分析合金元素对高强度低合金钢组织和性能的影响奠定基础。 相似文献
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研究了不同终轧温度及轧后冷却速度对低碳Mn-Nb-Cu钢的力学性能(σs,σb和δ5)的影响。研究结果表明,对控轧低碳Mn-Nb-Cu钢的力学性能的影响主要决定于钢的碳当量;随轧后冷却速度的提高,σs和σb提高,δ5降低;在奥氏体未再结晶区进行轧制,终轧温度对铁素体晶粒尺寸的影响较小。 相似文献
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为了优化工艺与提高高速铜的性能,对高速钢T15进行了不同的热加工变形,其变形量分别为0%,27.7%,46.0%,59.7%,测试了高速钢T15的硬度,抗弯曲度,冲击韧性。结果表明,对热等静压粉末冶金高速钢来说,热加工不仅改变铜材的尺寸和形状,而且能够改善材料的性能。在本研究所选取的范围内,变形量为46.0%时获得了较好的综合力学性能。变形量并不是越大越好,当变形量增大到一定程度后,继续增加变形将不会有变化。 相似文献
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Microstructure and Mechanical Properties of a Dissimilar Friction Stir Weld between Austenitic Stainless Steel and Low Carbon Steel 总被引:1,自引:0,他引:1
Dissimilar fusion welding of austenitic stainless steels to carbon steels has some metallurgical and technical problems.It was suggested that the solid-state nature of friction stir welding(FSW) can overcome these problems and produce a sound weld with reliable mechanical properties.In this study,plates of 304 stainless steel and st37 steel were welded together by FSW at tool rotational speed of 600 r/min and welding speed of 50 mm/min.In the stir zone(SZ) of 304 stainless steel,the results showed a refined grain structure with some features of metadynamic recrystallization.In the SZ of st37 steel,the hot deformation of material in the austenite region produced small austenite grains.These grains transformed to fine ferrite and pearlite by cooling the material after FSW.The production of fine grains increased the hardness and tensile strength in the SZ of both sides with respect to their base metals(BMs). 相似文献
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论述了高强度低合金(HSLA)钢晶粒细化理论及强度提高途径,综述了高强度低合金(HSLA)钢晶粒细化技术及近年来的研究成果,探讨了超细晶技术的理论依据及存在问题。为高强度低合金钢组织超细化技术的理论研究和实际工程应用提供参考。 相似文献
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Luhan Hao Namin Xiao Chengwu Zheng Dianzhong Li Shenyang National Laboratory for Materials Science 《材料科学技术学报》2010,26(12):1107-1113
The microstructures and mechanical properties of deformation induced ferrite(DIF) in the low carbon steel Q235 under different deformation temperatures have been investigated systematically.Through deformation induced ferrite transformation(DIFT),ferrite grain can be refined to 3 μm and accounts for above 85% of the overall fraction.Yield strength of DIF(>500 MPa) is increased by up to 100% compared with the conventional low carbon steel.Comparison of microstructure and mechanical properties in the Q235 ste... 相似文献
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实验钢在传统C-Mn钢的基础上添加低合金元素Ti,通过调整钢中Mn元素含量,同时采用简便的控制轧制与控制冷却工艺,获得了良好的组织形态及纳米尺度析出物,从而在保证优良延伸性能的前提下大幅度提高了钢板的强度,显著降低了钢材成本。使用金相显微镜(OM)、扫描电子显微镜(SEM)和透射电子显微镜(TEM)对微观组织进行观察。结果表明:当实验钢Mn含量从1.05%(质量分数,下同)提高至1.5%,平均晶粒尺寸从6.4μm细化至5.2μm;基体中纳米尺度TiC的析出量明显增加;屈服强度、抗拉强度和断后伸长率分别提高了56.7,42.2MPa和1.2%,达到了558.7,662.2MPa和22.4%。 相似文献
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为提高低合金高强铸钢(HSLA)的综合力学性能,满足恶劣环境下的使用要求.采用光学显微镜、扫描电镜、透射电镜、冲击试验机、万能材料试验机研究了3种不同冷速及高温回火对HSLA铸钢组织与力学性能的影响.结果表明:随冷速增加,淬火组织发生由多边形铁素体+针状铁素体+粒状贝氏体→粒状贝氏体+板条贝氏体→准上贝氏体+板条马氏体的演变.冷速为1℃/s的空冷样,具有最高的塑韧性;冷速最大的水冷样,其强度、硬度最高.冷却样经580℃回火,其晶界、板条界均有粒状、短棒状的纳米第二相析出,EDS分析表明,100~200 nm的析出相为合金渗碳体(M3C),而50 nm以内的析出相为(V,Ti)(C,N).空冷样回火后有较高强度、最高的塑韧性;油冷、水冷样回火后,Re提高,Rm略有下降,AkU降低与高温回火脆性的发生有关,但-40℃的AkU仍有60、40 J,具有较好的低温冲击韧性.可见,试验HSLA铸钢表现出良好的综合力学性能,能满足在恶劣环境下的使用要求. 相似文献
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Effects of microalloying Ti and B on themicrostructures and low temperature toughness ofmanual metal arc (MMA) deposits were investi-gated.Weld metals containing 200-300 ppm Ti and29-60 ppm B deposited by manual coated elec-trodes provided an optimum low temperaturetoughness.The addition of B in weld metals low-ered the γ→α transformation temperature whichpromoted the acicular ferrite (AF) transformation.Solid solutioned B suppressed grain boundaryferrite as well as side plate ferrite formation andbenefited the acicular ferrite formation.Titaniumprotected B from oxidizing as well as nitriding andformed Ti-Mn silicate inclusions.Ultra-high volt-age electron microscope analyses showed that TiOstructure in the Ti-Mn silicate inclusions was thefavorable nucleation site for acicular ferrite forma-tion. 相似文献
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In this study,Cu was added as the third additive to lower the sintering temperature of W-Ni-Fe alloy .By adding 2wt pct Cu, 2 dense 93W-3.5Ni-1.5Fe-2.0Cu tungsten alloy was obtained by hot-pressing at a low temperature of 1573K which is a process of liquid-phase sintering.As a result,the morphology of W-Ni-Fe alloy changed obviously after the addition of Cu and the alloy had higher relative density and rupture strength.The mechanism of the densification of W-Ni-Fe-Cu alloy at the low temperature was then mainly investigated.It was found that ,part sintering activators Ni and Fe could exist in liquid form at 1573 K due to the addition of Cu, which made it easy for Ni and Fe to dissolve W and thus the full densification of W-Ni-Fe-Cu alloy at the low temperature was realized. 相似文献