钽在熔盐中阳极氧化膜的组织和性能

对钽在高温硝酸盐中阳极氧化所形成膜的组织和性能进行了研究。试验结果表明 ,膜层基本上是由钽的氧化物相构成。该膜层具有高的硬度和良好的抗碱腐蚀性能     

大倾角大采高综采面顶板事故防治

本文详细介绍了大倾角大采高综采工作面的防片帮措施、支架的防倒防滑措施以及顶板冒落后的防治措施。     

大倾角煤巷锚梁网支护试验研究

本文提出了大倾角煤巷锚杆支护设计方法，根据此法对王庄矿回采巷道进行了锚梁网支护设计，并进行了工业性试验，取得了成功，试验方案为同类条件的为巷支护提供了经验。     

大倾角煤巷锚梁网支护试验研究

本文提出了大倾角煤巷锚杆支护设计方法，根据此法对王庄矿回采巷道进行了锚梁网支护设计，并进行了工业性试验，取得了成功。试验方案为同类条件的煤巷支护提供了经验     

球墨铸铁曲轴气体氮碳共渗鼓泡机理探讨

通过对球墨铸铁曲轴气体氮碳共渗的工艺过程及失效组织分析，找出了球铁曲轴在气体氮碳共渗过程中渗层鼓泡的原因，为改进处理工艺、降低鼓泡率奠定了基础。     

Effect of TiC whisker addition on properties of YG10F alloy

The cemented carbide material （YG10F） with different additions of TiC whisker （0%, 0.3%, 0.6%, mass fraction） was prepared by different techniques. The effect of TiC whisker addition on the density, microhardness and toughness of the experimental material was investigated. The results indicate that after the wet-milling for 8 h and sintering in vacuum at 1 440 ℃, the toughness of YG10F is remarkably improved and meanwhile higher microhardness is obtained by 0.3% TiC whisker addition. Preliminary analysis suggests that the main toughening mechanism of TiC whisker in YG10F is whisker pull-out and bridging phenomena.     

新型冷作模具钢JK2研究

为了提高冷作模具的使用寿命，研制了新型冷作模具钢ＪＫ２（７Ｃｒ５Ｍｏ３ＳｉＶ）。试验结果表明，该钢具有较高的强韧性，抗压强度与Ｃｒ１２钢和高速钢相近，而抗弯强度和冲击韧性则优于Ｃｒ１２钢和高速钢。     

Y_2O_3对再生WC-8Co硬质合金性能的影响

以锌熔法回收的WC-Co复合粉末为原料,采用粉末冶金生产工艺制备了再生WC-8Co硬质合金及添加0.4%Y2O3的再生WC-8Co-RE硬质合金,并对其密度、硬度、抗弯强度及断口形貌等进行了检测和分析。结果表明,与再生WC-8Co硬质合金相比,再生WC-8Co-RE硬质合金的抗弯强度明显提高,达到2620 MPa。     

Influence of high pressure during solidification on the microstructure and strength of Mg-Zn-Y alloys

The effect of high pressure during solidification on the microstructure and mechanical property of Mg-6Zn-1Y and Mg-6Zn-3Y was investigated using optical microscopy, scanning electronic microscopy, X-ray diffraction(XRD) and Vickers-hardness testing. Under atmospheric-pressure solidification, Mg-6Zn-1Y consisted of α-Mg, Mg7Zn3 and Mg_3YZn_6; whilst Mg-6Zn-3Y consisted of α-Mg, Mg_3Y_2Zn_3 and Mg_3YZn_6. Under 6 GPa high-pressure solidification, both alloy consisted of α-Mg, MgZ n and Mg12 YZn. The shape of the main second phase changed from a lamellar structure formed for atmospheric-pressure solidification to small particles formed for solidification at 6 GPa pressure. The dendrite microstructure was refined and was more regular, and the length of the primary dendrite arm increased under 6 GPa high-pressure solidification, which was attributed to increasing thermal undercooling, compositional undercooling and kinetics undercooling. After solidification at 6 GPa pressure, the solid solubility of Y in the second phase and the Vickers-hardness increased from 15 wt.% and 69 MPa for Mg-6Zn-1Y to 49 wt.% and 97 MPa; and from 19 wt.% and 71 MPa for Mg-6Zn-3Y alloy to 20 wt.% and 92 MPa, respectively.     

XFEM研究304不锈钢单边裂纹的高周疲劳扩展

为了研究金属微裂纹材料在较低的循环应力水平下的使用寿命,通过裂纹尖端奇异点的XFEM方法和Paris疲劳裂纹扩展理论研究了304不锈钢薄片样本的单边裂纹疲劳扩展行为,分别通过试验和数值模拟分析了高周疲劳应力循环下的裂纹扩展情况。结果表明,试验样本的总疲劳循环寿命约为1 180 000次。模拟的裂纹扩展速率与实际的试验扩展速率吻合度较好,通过XFEM计算出的裂纹增长数值解与应力强度函数确定的解析解在全区有较好的非线性拟合度,但是由于随着裂纹长度的不断增加,裂纹尖端应力强度因子的运算不稳定性增大,导致在III区中,数值解与解析解的?K值出现了非线性拟合度降低的趋势。