板条贝氏体中少量铁素体对高强钢强韧性的影响

以一种低成本高强钢为研究对象,对其实施了不同冷却模式的TMCP工艺实验,并利用光学显微镜、拉伸试验机、冲击试验机对其组织与力学性能进行了研究.实验结果表明:通过相变强化和在两相区的保温处理,在以板条贝氏体为主的实验钢组织中引入少量铁素体,使其拥有高强度、高冲击韧性等综合力学性能.在同类工艺条件下,试验钢的抗拉强度、屈服强度以及屈强比随终冷温度降低而升高,延伸率和断面收缩率随终冷温度降低而降低.

“高强聚酯纤维柔性网”工艺在综采工作面中的应用

潞新一矿5141F综采工作面自然发火严重,严重威胁工作面安全生产。为防止工作面再次发火,故采用"高强聚酯纤维柔性网"铺顶工艺代替金属网片铺、联网工艺,简化了收尾工序,作业面末采收尾的效率和资源利用率大幅提升,为支架回撤通道留设、支架撤除期间安全管理提供保障。该工艺对类似开采条件下综采工作面的安全回撤具有推广应用价值。

大型高强钢卜型月牙肋钢岔管制造安装技术探讨与实践

叙述了恰甫其海水电站690MPa级材钢岔管制造安装技术,采用计算机优化得到岔管管壁瓦块的合理划分,经数字三维仿真掌握管节间焊缝坡口变化规律及重要数据,用计算机虚拟实境技术取代了预组装工艺,通过严格的材料控制、计算机技术的应用、焊接工艺控制及振动时效技术消除岔管焊接残余应力等方面的工作,以及通过计算机技术和组织管理相结合,岔管安装能够在缩短施工时间和节约资金的前提下得以完成。

浅析下承式钢桁梁铁路桥制造技术

铁路桥多数采用下承式钢桁梁的结构类型,在制作过程中下承式钢桁梁铁路桥有诸多难点,特别是下弦杆组装工艺、高强螺栓钻孔工艺、桥面板焊接及变形的控制等,通过采用先进的工艺措施和方法,可实现一次预装合格,提高了生产的效率,提升了产品的质量。

Study of front bumper process on the basis of hot stamping

The fitting method is used for obtaining the constitutive relation of ultra-high strength steel in this paper. At the same time, the forming limit of material is researched under different de/brmation conditions. Through experiments, the paper obtains stress-strain curve under different deformation temperatures and strain rates. On the basis of experimental data, the constitutive relation model is established which can reflect the de- fomlation capacity of ultra-high strength steel during process of hot stamping. Combining with finite element simulation results of hot stamping by the commercial software AUTOFORM, transfer path of load and matching law of strength, the paper determines the design criteria and forming process requirements of parts manufactured by hot stamping. Through setting different process parameters, such as punch velocity and friction coefficient, and blank shape, the paper finds that process parameters and blank shape have an essential effect on the quality of parts.

一种高强GH4169合金转子叶片精密成形技术研究

采用挤预锻坯、精锻、精密冷辊轧成形的工艺方法,实现了GH4169合金高压压气机转子叶片精密成形,金相组织和力学性能均达到了GH4169合金高强工艺锻件标准的要求。