贝氏体耐磨钢焊接组织与性能研究

贝氏体耐磨钢焊接组织与性能研究

目 录

摘 要............................................................................................................................ 1

Abstract........................................................................................................................ 2

1.绪论............................................................................................................................ 3

1.1 贝氏体相变与贝氏体钢................................................................................. 3

1.2 贝氏体耐磨钢的应用..................................................................................... 3

1.3 贝氏体钢的发展与前景................................................................................. 4

1.4主要研究内容及意义...................................................................................... 5

1.4.1主要研究内容....................................................................................... 5

1.4.2 实验意义.............................................................................................. 5

2.实验方法及过程........................................................................................................ 6

2.1 技术路线......................................................................................................... 6

2.2 实验材料及设备............................................................................................. 7

2.3 自制焊条的配方............................................................................................. 9

2.4 焊接过程......................................................................................................... 9

2.4.1焊前准备............................................................................................... 9

2.4.2 实验参数............................................................................................ 10

2.4.3 施焊.................................................................................................... 10

2.5 金相组织检测............................................................................................... 10

2.6 显微硬度测试............................................................................................... 11

3.实验结果与分析...................................................................................................... 13

3.1焊条焊接工艺性能........................................................................................ 13

3.2金相组织分析................................................................................................ 14

3.2.1母材..................................................................................................... 14

3.2.2 焊缝.................................................................................................... 15

3.2.3 熔合区................................................................................................ 16

3.2.4 热影响区............................................................................................ 17

3.3显微硬度分析................................................................................................ 19

贝氏体耐磨钢焊接组织与性能研究

3.3.1 JD-960焊条的焊接接头显微硬度................................................... 19

3.3.2自制焊条的焊接接头显微硬度......................................................... 20

3.3.3 两种焊条焊接接头显微硬度的对比................................................ 21

4.结论分析.................................................................................................................. 23

致谢.............................................................................................................................. 24

参考文献：.................................................................................................................. 25

贝氏体耐磨钢焊接组织与性能研究

贝氏体耐磨钢焊接组织与性能研究

材料科学与工程专业

学生：陈建孟 指导教师：向朝进

摘 要

本文研究了贝氏体相变过程与贝氏体耐磨钢的发展应用，通过用自制焊条与标准焊条对贝氏体耐磨钢进行手工电弧焊焊接实验，对比分析两组焊接工艺性能，观察显微金相与显微硬度，得出合金元素对焊接接头的影响。可以发现，自制焊条中由于钼元素增多，焊接接头各区域的组织得到了不同程度的细化，焊缝与熔合区的显微硬度也得到了提高。

关键词：贝氏体耐磨钢， 焊接工艺， 贝氏体， 显微金相

贝氏体耐磨钢焊接组织与性能研究

Abstract

This thesis studies the development and application of bainite bainite transformation process of wear-resistant steel, with homemade rod by rod and standard wear-resistant steel for bainite SMAW welding experiments, comparative analysis of two sets of welding performance, observe metallurgical microstructure and micro hardness, drawn influence of alloying elements on welded joints. You can find homemade electrode due to an increase in molybdenum, the regional organization of welded joints have been varying degrees of refinement, micro-hardness weld and fusion zone has also been improved.

Keywords:Bainite resistant steel，Welding ，Bainite，Metallurgical Microstructure

贝氏体耐磨钢焊接组织与性能研究

1.绪论

1.1 贝氏体相变与贝氏体钢

钢中的贝氏体转变是过冷奥氏体在介于珠光体和马氏体转变温度区间的一种转变，又简称为中温转变，由于贝氏体，尤其是下贝氏体组织具有良好的综合力学性能，故生产中常将钢奥氏体化后过冷至中温转变区等温停留，使之获得贝氏体组织，这种热处理称为贝氏体等温淬火，对于有些钢来说，也可在奥氏体化后以适当的冷却速度(通常是空冷)进行连续冷却来获得贝氏体组织，采用等温或连续冷却淬火获得贝氏体组织后，除了可使钢得到良好的综合力学性能外，还可在较大程度上减少像一般淬火(得到马氏体组织)那样产生的变形和开裂倾向[1]。

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