Microstructure, properties and hot workability of M300 grade maraging steel  

作　　者：K.V.A.Chakravarthi N.T.B.N.Koundinya S.V.S.Narayana Murty B.Nageswara Rao 

机构地区：[1]Materials and Mechanical Entity, Vikram Sarabhai Space Centre [2]Research scholar, Department of Mechanical Engineering, K L University [3]Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology [4]Department of Mechanical Engineering, K L University

出　　处：《Defence Technology（防务技术）》2018年第1期51-58,共8页Defence Technology

摘　　要：This paper presents isothermal uniaxial compression test results of M300 grade maraging steel over a wide range of temperatures(900 e1200℃) and strain rates(0.001 e100 s^(-1)) to examine hot deformability and concurrent microstructural evolution. Processing map is generated and indicated the optimum processing parameters in the temperature range of 1125℃-1200℃ and strain rate range of 0.001 e0.1 s^(-1). High values of the efficiency of power dissipation, microstructural observations and EBSD results indicate softening mechanism to be the occurrence of dynamic recrystallisation. Material constants in a constitutive relation are evaluated from the flow stress data useful in computer modelling.This paper presents isothermal uniaxial compression test results of M300 grade maraging steel over a wide range of temperatures(900 e1200℃) and strain rates(0.001 e100 s^(-1)) to examine hot deformability and concurrent microstructural evolution. Processing map is generated and indicated the optimum processing parameters in the temperature range of 1125℃-1200℃ and strain rate range of 0.001 e0.1 s^(-1). High values of the efficiency of power dissipation, microstructural observations and EBSD results indicate softening mechanism to be the occurrence of dynamic recrystallisation. Material constants in a constitutive relation are evaluated from the flow stress data useful in computer modelling.

关 键 词：ACTIVATION energy CONSTITUTIVE RELATION HOT deformation M300 GRADE maraging steel Processing map 

分 类 号：TJ[兵器科学与技术]