论文总字数：24624字

摘 要

本文对双相不锈钢的氢脆敏感性做了研究，通过预应变和电化学充氢过程中对于材料被拉伸时各项数据的测算，最终得出结论，对双相不锈钢的金属力学性能有系统性的阐述，在一定程度上对双相钢的氢脆研究有一定的作用。文章也验证了很多的理论，对以后双相不锈钢的使用具有很大的意义，所以本文具有一些学术价值，对工程应用方面来说，有一定的应用的价值。

1. 在不同的电流密度下对双相不锈钢进行的电化学充氢试验，由此来判断电流密度对于双相不锈钢的影响，同时，并且通过这个试验能够判断氢扩散速度对于材料的塑性会有多大的影响。
2. 第二次探究的是预应变在金属材料中产生了什么样的影响，研究发现，一定程度上的预应变会加大材料的硬度，材料的耐磨性，这是对加工硬化的进一步研究结果。
3. 接着探究的是在不同预应变的情况下，对金属试样进行了电化学充氢，让氢离子在金属的内部进行了扩散，在由单轴拉伸试验机去拉伸四个试样，并通过绘图进行分析模拟了在钢厂中的冷加工会对后期的双相不锈钢的氢脆产生的影响，由此得出一些结论。本文还对氢能的发展现状，氢脆理论，预应变的理论，以及电化学充氢的微观机理理论都有有所涉猎。这为以后对材料研究会提供理论依据。

关键词：双相不锈钢 预应变 电化学充氢 氢脆 加工硬化

ABSTRACT

In this paper, the hydrogen embrittlement sensitivity of biphase stainless steel is studied. Through the calculation of the data when the material is stretched in the process of pre-strain and electrochemical hydrogenation, it is concluded that the mechanical properties of biphase stainless steel are systematically described. To a certain extent, it has a certain effect on hydrogen embrittlement of bipolar steel. To a certain extent, many models and theories have been verified, which is of great significance for the future use of dual-phase stainless steel. Therefore, this article has some academic value and has a certain application value for engineering applications

1. The formation of steel/aluminum laser lap joint was studied, under conditions of adding no intermediate layer and adding different intermediate layers (Ni foil, Ni Cu foil). When the laser power is increased, the melt penetration width increases. When the welding speed increases, the penetration depth is shallow, the amount of defocus will make the penetration depth decline, but no significant change in melting width. When the welding power is 5kW, the defocus amount is 9mm, and the welding speed is 2.5m/min, the welded joint is well formed. After adding different types of intermediate layers, the penetration depth H1 and the width D1 of the steel/aluminum laser lap joint did not change significantly, the heat affected zone of welds was also not changed obviously under. But the depth of H2 is affected by the influence of the middle layer.
2. Electrode chemical hydrogenation tests of two-phase stainless steel using different current densities determine the effect of current density on two-phase stainless steel at a time. At the same time, through this, it is possible to determine how much hydrogen diffusion speed will affect the plasticity of the material.The impact, And because hydrogen is present in the trap, the results of studying the change in current density in electrochemical will be studied.

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(3)Then we explore the electrode chemical hydrogenation of the metal sample under different pre-strain conditions, allowing the hydrogen ions to spread inside the metal, and stretching the four samples by a single-axis tensile tester. The effect of cold addition on hydrogen embrittlement of the later phase double phase stainless steel issimulated by drawing analysis, and some conclusions are drawn. There are also developments in the development of hydrogen energy, as well as hydrogen embrittlement theory and micro mechanism theory. This will provide the theoretical basis for the materia.

Key words: Double phase stainless steel ;Pre-strain; Electrode chemical hydrogenation ; Hydrogen embrittlement ; Processing hardening

目录

摘要......................................................I

ABSTRACT.................................................................II

第一章 绪论

1.1 引言（研究背景及意义）................................1

1.2 金属氢脆现象的研究进展................................2

1.3 双相不锈钢氢脆的研究进展..............................4

1.4 预应变对双相不锈钢氢脆的研究进展......................4

1.5 本文的主要研究内容....................................6

第二章 电化学充氢后2205双相不锈钢的氢脆敏感性

2.1 引言..................................................6

2.2 试验内容与方法........................................6

2.2.1试验材料与式样..............................................6

2.2.2电化学充氢试验..............................................7

2.2.3单轴拉伸试验................................................8

2.3 实验结果与讨论

2.3.1 电流密度对双相钢内部氢脆的影响...........................10

2.3.2断口形貌特征...............................................12

2.4 本章小结.............................................15

第三章 预应变后2205双相不锈钢氢脆敏感性..........16

3.1 引言................................................16

3.2 试验内容与方法......................................16

3.2.1试验材料与式样............................................17

3.2.2双相不锈钢的预应变试验...................................17

3.2.3 双相不锈钢的电化学充氢试验.............................17

3.2.4 双相不锈钢的单轴拉伸试验...............................18

3.3 实验结果与讨论.......................................18

3.3.1 预应变程度对双相不锈钢的影响............................18

3.3.2预应变对充氢前后金属性能的影响............................19

3.3.3断口样貌.................................................21

3.4 本章小结.............................................24

第四章 研究工作的经济性分析......................24

4.1 本文主要工作总结....................................24

4.2 学术意义和工程应用价值..............................24

4.3 论文工作创新之处....................................24

4.4 后期工作展望........................................25

参考文献...............................................26

致谢...................................................29

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