Prediction for Flow Stress of 95CrMo Hollow Steel During Hot Compression

Abstract

The compressive deformation behavior of 95CrMo hypereutectic steel was studied at temperatures ranging from 800 to 1050°C and strain rates from 0.1 to 3 s-1 on a Gleeble-3500 thermo-simulation machine. The results showed that, with the decrease in deformation temperature and increase in strain rate, the fragmented retained austenite in finer and distributed more uniformly in the ferrite matrix as a result of the inhibited recovery. The recorded flow stress suggested that the stress level decreases with increasing temperature and decreasing strain rate. Based on the classical stress-dislocation relation, the constitutive equations of flow stress determined by work-hardening and softening mechanisms were established. A comparison between the experimental and calculated values confirmed the reliability of the model, and the predictability of the model was also quantified in terms of correlation coefficients and average absolute relative errors, which were found generally above 0.99 and below 2.50%, respectively. In the whole range of strain rate, the activation energy is 419.84 kJ/mol. By further identification based on Schöck's model and Kocks-Argon-Ashby model, the ratecontrolling mechanism is found to be dislocation cross-slip.

An improved constitutive model for high-temperature flow behaviour of the Fe–Mn–Al duplex steel

“…The addition of alloy elements such as Cr, Mo, Cu, and Ni will decrease the value of α , e.g. 0.009547 MPa −1 in the 95CrMo steel which contains high content of Cr, Mo [30]. Hence, the relatively large value of α in this paper possibly results from the mere addition of Mn and Al.…”

Preparation of TiC reinforced CrMo steel by 3D gel-printing

“…Chromium-molybdenum (CrMo) steel refers to the alloy steel with the addition of chromium and molybdenum alloy elements to significantly improve the strength. It has advantageous properties, including high strength and wear resistance, good toughness and hardenability, excellent high temperature resistance and hydrogen corrosion resistance, as well as the ability to withstand impact loading and low notch sensitivity [1][2][3][4][5][6]. Because of these excellent properties, as a structural material, CrMo steel is widely used in many fields, such as automobile manufacturing, electricity industry and petrochemical industry, to manufacture machine parts such as gears, bearings, crankshafts and automobile parts [1,2,4,5,7].…”

“…Chromium-molybdenum (CrMo) steel refers to the alloy steel with the addition of chromium and molybdenum alloy elements to significantly improve the strength. It has advantageous properties, including high strength and wear resistance, good toughness and hardenability, excellent high temperature resistance and hydrogen corrosion resistance, as well as the ability to withstand impact loading and low notch sensitivity [1–6]. Because of these excellent properties, as a structural material, CrMo steel is widely used in many fields, such as automobile manufacturing, electricity industry and petrochemical industry, to manufacture machine parts such as gears, bearings, crankshafts and automobile parts [1,2,4,5,7].…”

Hot tensile deformation study and constitutive modeling of new high zinc containing hot rolled Al–Zn–Mg–Cu alloy

“…Various models have been proposed based on the results to predict flow behavior. In all those models, some equations are proposed which estimates the power or load required for the hot deformation process and flow behavior using true stress strain curve [8][9][10][11][12][13][14][15][16]. Some researchers have also made effort to simulate various test results.…”