Residual Stresses and Micro-Hardness Testing in Evaluating the Heat Affected Zone’s Width of Ferritic Ductile Iron Arc Welds

作     者：Georgios K. Triantafyllidis Dimitrios I. Zagliveris Dionysios L. Kolioulis Christos S. Tsiompanis Titos N. Pasparakis Athanasios P. Gredis Melina L. Sfantou Ioannis E. Giouvanakis Georgios K. Triantafyllidis;Dimitrios I. Zagliveris;Dionysios L. Kolioulis;Christos S. Tsiompanis;Titos N. Pasparakis;Athanasios P. Gredis;Melina L. Sfantou;Ioannis E. Giouvanakis

作者机构：Department of Chemical Engineering Aristotle University Thessaloniki Greece 

出 版 物：《Materials Sciences and Applications》 (材料科学与应用期刊（英文）)

年 卷 期：2016年第7卷第1期

页      面：73-82页

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

主　　题：Welds Heat Affected Zone Residual Stresses Micro-Hardness Vickers Heat Affected Zone’s Width 

摘      要：Shielded Metal Arc Welding (SMAW) in Ductile Irons (DI) is often required by foundries for practical manufacturing reasons. The mechanical properties of the welded structures are strongly dependent on their HAZ’s width. A model based on the behaviour of the ferritic matrix of high-Si DIs in order to make an approach in measuring their HAZ’s width is developed in this study. A series of thermal treatments on 3.35 and 3.75 wt% Si as-cast DIs and spot SMAWs is applied on these materials. The applied SMAWs are done on non-preheated and preheated samples (150℃ - 300℃). For welding we modify the amperage (100 - 140A). The micro-hardness Vickers changes in the ferrite of the as-cast samples and inside the HAZ of the welded ones can be attributed to the existence of residual stresses (RS) in the ferritic matrix and assist in estimating the HAZ’s width.