金属学报  1982, Vol. 18 Issue (1): 47-57

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氢致滞后塑性变形机理研究

褚武扬;肖纪美;李世琼;朱淑彦

北京钢铁学院;北京钢铁学院;北京钢铁学院;北京钢铁学院

MECHANISM OF HYDROGEN INDUCED DELAYED PLASTICITY

Chu Wuyang; Xiao Jimei (Hsiao Chi-mei); Li Shiqiong; Ju Shuyan (Beijing University of Iron and Steel Technology; Beijing)

褚武扬;肖纪美;李世琼;朱淑彦. 氢致滞后塑性变形机理研究[J]. 金属学报, 1982, 18(1): 47-57.
, , , . MECHANISM OF HYDROGEN INDUCED DELAYED PLASTICITY[J]. Acta Metall Sin, 1982, 18(1): 47-57.

摘要 参考文献 相关文章 Metrics 全文: PDF(1337 KB)   摘要: 利用光滑拉伸试样以及带有应力梯度的弯曲试样和预裂纹试样(Ⅰ型、Ⅲ型以及Ⅰ—Ⅲ复合型),研究了氢对产生局部宏观塑性变形所需外应力(称为表观屈服应力)的影响。结果表明,氢对低合金钢的屈服强度影响不大,但如试样中存在拉应力梯度,则当钢的强度和进入试样的氢浓度超过临界值后,氢能使表观屈服应力明显下降,这就是氢致滞后塑性变形的原因。 氢致表观屈服应力的下降是由氢的扩散所控制的。它明显依赖加载速度和试验温度。但它随试验温度的变化不是单调的,在室温附近存在一个极值。 对仅存在剪应力梯度的Ⅲ型裂纹试样,充氢后表观扭转屈服应力并不降低,沿原裂纹面也不产生滞后裂纹,即K_(ⅢH)=K_(ⅢC),但在和原裂纹面成-45°的平面上却能产生氢致滞后塑性变形和裂纹。对Ⅰ—Ⅲ复合型试样,只有当恒定的K_Ⅰ大到足以单独就能产生滞后塑性变形时才能使表观扭转屈服应力开始下降。 提出了一个氢使表观屈服应力下降的机构。 Abstract：For various carbon and low-alloy steels with a wide range of the tensile strength, the effect of hydrogen on the apparent yield stress, which is a necessary exterior stress to produce the local macroscopi c plasti c deformation, was investigated with smooth tensile, bending, pre-cracked type Ⅰ-, type Ⅲ- and combined type Ⅰ+Ⅲ specimens. The results show that the effect of hydrogen on the yield strength of a smooth tensile specimen is insignificant, the difference between the charged and uncharged specimens is less than 10％. However, for the smooth bending or pre-cracked Ⅰ-type specimen with a. tensile stress gradient, hydrogen can decrease the apparent yield stress considerably if the strength of steel and the amount of hydrogen entering into the specimen exceed their critical values. This is the cause of hydrogen induced delayed plastic deformation and hydrogen induced delayed cracking.The effect of hydrogen on the apparent yield stress increases with increasing strength of the steel and average hydrogen concentration in the specimen. The reduction of the apparent yield stress of charged pre-cracked specimens is more evident than that of smooth bending ones. The hydrogen induced apparent yield stress reduction is a phenomenon controlled by hydrogen diffusion, it depends markedly on the strain rate and test temperature.For type Ⅲ- cracked specimens, in which there is no hydrostatic stress the apparent torsional yield stress of the charged specimens does not decrease and K_(ⅢH)=K_(ⅢC). But hydrogen induced delayed plasticity and cracking can occur on the specific plane inclined at an angle of —45° to the original crack plane, For combined type Ⅰ+Ⅲ specimens, the apparent torsional yield stress can be decreased only when K_1 is so large that hydrogen induced delayed plasticity can occur under the action of K_1 itself. 收稿日期: 1982-01-18      服务 把本文推荐给朋友 加入引用管理器 E-mail Alert RSS 作者相关文章 褚武扬 肖纪美 李世琼 朱淑彦 44.8K 链接本文: https://www.ams.org.cn/CN/      或      https://www.ams.org.cn/CN/Y1982/V18/I1/47 1 褚武扬;肖纪美;李世琼;王枨,金属学报,16(1980) ,179． 2 Chu,W.Y.(褚武扬):Hsiao,C.M.(肖纪美);Li,S.Q.(李世琼),Scr.Metall.,13(1979) ,1063． 3 Chu,W.Y.(褚武扬);Li,S.Q.(李世琼);Hsiao,C.M.(肖纪美);Tien,Z.J.(田中卓),Corrosion,36(1980) ,475． 4 Chu,W.Y.(褚武扬);Liu,T.W.(刘天化);Hsiao,C.M.(肖纪美);Li,S.Q.(李世琼),Corrosion,in Press. 5 褚武扬;肖纪美;李世琼,金属学报,17(1981) ,10． 6 Beachem, C. D., Metall. Trans. 3 (1972) , 437． 7 Qriani, R. A., Annu. Rev. Mater. Sci.; 8 (1972) , 3270． 8 褚武扬,断裂力学基础,科学出版社,1979,p.29． 9 Gerberich, W. W.; Garry, J.; Lessar, J. F., Effect of Hydrogen on Behavior of Materials, Eds. Thompson, A. W.; Bernstein, I. M., AIME, New York, 1976, p. 70． 10 Fujita, F. E., Hydrogen in Metals, Oxford, Pergamon, 1978, p. 2B10． 11 褚武扬;肖纪美;朱淑彦,Ⅲ型试样的氢致滞后裂纹(待发表). No related articles found! Viewed Full text Abstract Cited   Shared      Discussed