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

J Mater Sci Technol ›› 2010, Vol. 26 ›› Issue (9): 798-802.

• Mechanical and Functional Properties of Materials • Previous Articles Next Articles

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

,Fu Wantang, , ,

1) State Key Laboratory of Metastable Materials Science and Technology, College of Materials Science and Engineering, Yanshan University, Qinhuangdao 066004, China
2) China First Heavy Industries, Qiqihar 161042, China

Received:2009-07-20 Revised:2009-10-27 Online:2010-09-21 Published:2010-09-21
Supported by:
the National Science and Technology Support Plan of China (No. 2007BAF02B01-03)

Abstract

Abstract:

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.

Key words: High nitrogen CrMn austenitic stainless steel, Preheating temperature, Surface cracking, Delta ferrite

Zhenhua Wang Wantang Fu Shuhua Sun Zhiqing Lv Wenhui Zhang. Effect of Preheating Temperature on Surface Cracking of High Nitrogen CrMn Austenitic Stainless Steel[J]. J Mater Sci Technol, 2010, 26(9): 798-802.

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

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