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二辊楔横轧轧件的微观组织

   楔横轧技术作为一种轴类零件的成形工艺,因其具有节材显著、生产效率高、低噪音等优点而被广泛运用[1,2]。但是,由于该技术涉及诸如复杂的三维热变形、特种模具设计、产品组织性能优化等多种学科相互交叉的问题,所以使楔横轧工艺的研究、推广受到制约。目前,许多学者已经着手开展这方面的工作,且大多数研究主要针对楔横轧过程的成形条件及轧件的旋转稳定性和心部缺陷等[3~5]。关于模具的设计也有文献报道[6]。

  由于数值模拟技术的日益成熟,其已运用于楔横轧技术中,并且在预报方面也取得了不少成就[7,8]。尽管如此,对于这种多轴变形方式的工艺,有关轧后工件的微观形态以及低温相组成方面的研究仍不多见。为此,笔者以二辊楔横轧实验为基础,充分考虑原始棒料直径、变形温度、断面收缩率以及工件轧后热处理状态等,进行了系列轧制实验。为了研究楔横轧轧制方式下工件的性能,对轧后工件进行指定位置线切割取样,并采用金相分析法得到变形后工件的高温奥氏体晶粒尺寸分布及低温相组成,为进一步弄清楔横轧后工件的组织性能做实验储备。1实验过程1·1实验轧机楔横轧机因其模具配置形式的不同可分为5种类型

更多请关注:博狗体育 澳门葡京赌场
 
 

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