Effect of Preheating Temperature on Surface Cracking of High Nitrogen CrMn Austenitic Stainless Steel

• Published in: Journal of materials science & technology Vol. 26; no. 9; pp. 798 - 802
• Main Authors: Wang, Zhenhua, Fu, Wantang, Sun, Shuhua, Lv, Zhiqing, Zhang, Wenhui
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 2010
• Subjects: Delta ferrite; High nitrogen CrMn austenitic stainless steel; Preheating temperature; Surface cracking; δ铁素体; 光学显微镜; 地表裂缝; 开裂行为; 扫描电子显微镜; 热加工性; 预热温度; 高氮奥氏体不锈钢; Delta ferrite; Preheating temperature; Surface cracking; High nitrogen CrMn austenitic stainless steel
• ISSN: 1005-0302; 1941-1162
• DOI: 10.1016/S1005-0302(10)60127-2

18Mn18Cr0.5N steel specimens were preheated at the temperatures from 1100 to 1250°C for 5 min,and then cooled to 950°C and compressed.The cracking behaviors were investigated using optical microscopy and scanning electron microscopy.The results showed that the hot workability of 18Mn18Cr0.5N steel gradually decreased with increasing preheating temperature between 1100 and 1200°C,and quickly deteriorated up to 1250°C.Above 1200°C,delta ferrite particles appeared in 18Mn18Cr0.5N steel,promoted cavity coalescence on grain boundary,and accelerated surface crack formation during the hot working process.