国产S30432喷丸管的喷丸形变层组织与硬度对比研究

The Comparison Research on Microstructure and Hardness of the Deformed Metal Layers of China-made Shot Blasted S30432 Tubes

通过对比试验研究,系统分析了国产S30432内壁喷丸管与进口Super304H内壁喷丸管在喷丸层表面状态、形变组织形貌特征、硬化效果方面的差异。研究结果表明喷丸应变硬化效果主要取决于碎化晶层和多滑移层的发育程度,尤其是取决于碎化晶层的发育程度。国产喷丸管子喷丸形变层中破碎化晶层和多滑移层的厚度及其均匀性都比不上进口管子,而且其有效硬化层的深度、硬度及其均匀性也比不上进口管子,因此,国内喷丸处理工艺水平与国外相比尚有一些差距,还有待进一步改进和提高。

Based on testing comparison,the paper makes a systematic analysis of the differences between the homemade shot-blasted S30432 tubes and the imported shot-blasted Super304H tubes in terms of surface appearance,microstructure features and hardening effect of the deformed metal layer.The study results indicate that the hardening effect of shot blasting mainly depends on the developing extent of the broken-grain sub-layer and the multiple-slipped-grain sub-layer in the deformed metal layers,especially the broken-grain sub-layer.The homemade SB tubes are inferior to the imported SB ones not only in the thickness and homogeneity of the broken-grain sub-layer and multiple-slipped-grain sub-layer,but also in the depth,hardness and homogeneity of the effective hardening layers.Therefore,the domestic manufacturers still lag behind the foreign counterparts in shot blasting techniques,and needs further modification and improvement.