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Influence of prephosphating on the forming behavior of galvanneal.

机译:预磷化处理对的形成行为的影响。

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摘要

Prephosphating of galvanneal steel sheet has been shown to improve its forming performance. This improvement is due to a reduced coefficient of surface friction caused by the prephosphate treatment. Increased levels of powdering have also been observed with prephosphated galvanneal during cup-drawing operations. A major aim of the current study was to gain an increased understanding of the reasons why prephosphating causes the coefficient of surface friction of galvanneal to decrease and the amount of powdering to increase.;The bare galvanneal steel substrate was treated with two different types of prephosphate treatments, a conventional spray process designed to deposit micron-sized phosphate crystals and a dried-in-place treatment designed to deposit a featureless phosphate coating on the galvanneal surface. The spray and dried-in-place treatments were each applied at two different coating weights so that different area fractions of the galvanneal surface were covered by the phosphate. Besides the four prephosphate treatments, a fluoride-etchant treatment designed to remove alumina from the galvanneal surface was also applied. In all cases, the effect of applying mill oil to the blanks was examined by forming cups in the oiled as well as in the non-oiled condition.;The different surfaces were characterized by SEM, ESCA and surface resistance measurements. Cup testing was used to evaluate forming behavior. Cups were drawn from blanks of each material and the maximum forming loads were measured. The changes in strain state along the walls of the cups as they were formed were measured using circle grid analysis. Numerical simulations using finite element analysis also were performed to assess the changes in local strain state with variations in the coefficient of surface friction. Powdering was also measured in conjunction with the cup tests by loss of weight and XRF methods. Both total and localized powdering amounts were measured.;Both spray and dried-in-place prephosphate treatments were found to reduce the maximum forming load required to form galvanneal cups. The maximum forming load was reduced by up to 12% when ;The prephosphate treatments increased the amount of galvanneal powdering from about 5 g/m
机译:业已表明,预镀锌钢板可改善其成形性能。该改进归因于由预磷酸盐处理引起的降低的表面摩擦系数。在拔杯操作过程中,用预磷酸盐化的凡尔林还观察到粉末含量增加。本研究的主要目的是加深对为什么预磷化会导致镀锌铁皮的表面摩擦系数降低和粉末化量增加的原因的理解。裸镀锌铁皮钢基材已用两种不同类型的预磷酸盐处理处理,一种传统的喷涂工艺设计成沉积微米级的磷酸盐晶体,而原位干燥处理则设计成将无特征的磷酸盐涂层沉积在电偶表面上。喷涂和就地干燥处理分别以两种不同的涂层重量进行,因此用磷酸盐覆盖了伽伐尼表面的不同面积分数。除了四种预磷酸盐处理外,还采用了旨在从电镜表面去除氧化铝的氟化物蚀刻剂处理。在所有情况下,都通过在上油和未上油条件下形成杯状杯来检验将研磨油施加到坯料上的效果。通过SEM,ESCA和表面电阻测量来表征不同的表面。杯测试用于评估成形行为。从每种材料的毛坯中抽出杯子,并测量最大成型载荷。使用圆网格分析测量沿杯壁形成时沿杯壁的应变状态的变化。还进行了使用有限元分析的数值模拟,以评估局部应变状态随表面摩擦系数变化的变化。还通过失重和XRF方法结合杯试验测量粉化。测量了总的和局部的粉末量。发现喷雾和就地干燥的预磷酸盐处理都减少了形成电偶杯所需的最大成形负荷。当进行以下处理时,最大成形负荷降低多达12%;预磷酸盐处理使镀锌粉末的量从约5 g / m增加

著录项

  • 作者

    Kunde, Navin Divaker.;

  • 作者单位

    Case Western Reserve University.;

  • 授予单位 Case Western Reserve University.;
  • 学科 Engineering Metallurgy.;Engineering Materials Science.
  • 学位 Ph.D.
  • 年度 1998
  • 页码 132 p.
  • 总页数 132
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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