喷丸机强化后的特点

1. 喷丸机表面的残余压应力的强弱和应力层的高层度取决于工件材料的结构和喷丸强度。材料的结构复杂、硬度高，压应力就越大，压应力层也比较浅。提高喷丸强度可以改善压应力层高层度。

通过对渗碳处理齿轮的分析，对比未喷丸机与喷丸工件的材料结构

2. 喷丸机后工件表层的显微结构发生变化，科学的喷丸机工艺可以显著提高表面硬度，对表面0.1mm的范围进行显微硬度测试，工件表层显微硬度明显提高，心部结构硬度基本相同，表层的硬度显著提高是受到搞的压残余应力、加工硬度和结构变化综合作用的结果。

3. 喷丸机后工件通过电子扫描显微镜观察发现，马氏体的微观亚结构被细化，残留奥氏体诱发转变为马氏体，用光学显微摄影仪观察，通过观察马氏体针得到很好的结论，再通过x射线衍射仪显示的衍射图判断，结构结果的变化有利于残余压应力的提高。

结论：

1. 喷丸机可以清理工件的油污、毛刺，取得轻度倒圆角光饰性，增强耐磨、润滑和耐腐蚀的功能;

2. 喷丸机强化可以显著提高工件表面的残余应力，提高工件的疲劳寿命;

3. 喷丸机使渗碳表面硬度增加，降低疲劳断裂和应力应力腐蚀(含氢脆)断裂，效果很明显。

4. 喷丸机能够使工件表层的结构强化，即残余奥氏体发生诱发马氏体转变，并能够细化马氏体的亚结构。

1 piece deep compressive residual stresses and stress shot peening the surface of the layer depends on the strength of the structure and strength of the workpiece material blasting . Materials with a complex , high hardness , the greater the compressive stress , the compressive stress layer is relatively shallow . Shot peening intensity can be improved to improve the compression stress layer depth.

Through the analysis of carburizing gear , materials and tissue contrast is not shot peening workpiece

2 microstructure of the workpiece surface after shot change scientific peening process may significantly increase the surface hardness , the surface of a range of 0.1mm for the microhardness test , the surface hardness of the workpiece significantly improved heart tissue hardness substantially same , the surface hardness is significantly increased by the pressure to engage in residual stresses , hardness and processing the results of the combined effects of organizational change .

3 after the blasting a workpiece by scanning electron microscopy revealed that the structure of martensite microstructure is refined sub ??residual austenite into martensite induced by optical microscopic observation of photographic apparatus , the martensite obtained by observing the needle good conclusion , and then displayed by x -ray diffraction to determine the diffraction pattern , the result of organizational changes will help improve the compressive residual stresses.

Conclusion:

1 shot to clean up the oil workpiece , burrs, made ??slight rounding polisher , enhanced wear, lubrication and corrosion-resistant features ;

2 peening surface can significantly improve the residual stress and improve the fatigue life of the workpiece ;

3 Shot carburized surface hardness increases, reducing fatigue and stress fracture stress corrosion ( including hydrogen embrittlement ) fracture , the effect is obvious.

4 Shot enables organizations to strengthen the workpiece surface , which induced martensitic transformation of residual austenite and martensite can refine substructure .