Effect of cold rolling on tensile properties and microstructure of high nitrogen alloyed austenitic steel

Abstract

The cold rolling strain effect on the tensile properties of a high nitrogen alloyed austenitic steel was systemically investigated. Quasi-static tensile experiments were performed on the samples with different cold rolling strain. The material possessed good balance between strength and ductility in the entire rolling strain range. Mechanical property and microstructure of the nitrogen alloyed austenitic steel were greatly affected by cold rolling strain. With the increase in cold rolling strain, the strength increased sharply but the ductility declined. That is related to the gradual changes of microstructure induced by the cold rolling process. The cold rolling process leads to substantial microstructural change, from the appearance of slip bands and twins at low cold rolling strain; the microtwins formation at intermediate cold rolling strain and followed by sequences of their bending, breaking and disappearance; and finally to the formation of drossy twins at the high cold rolling strain.

Study of strain induced martensite and its reversal on sensitization behaviour of metastable austenitic stainless steel

“…In CR50_TA sample, the volume of γ-austenite is increased as during thermal ageing, α' and ε- martensite transform into γ-austenite. It is called the reversion of the martensite into the austenitic phase (De et al , 2004; Bansod et al , 2016; Sun et al , 2013). From the above findings, it can be inferred that at a low strain rate, carbide precipitation occurs.…”

“…The author also concluded that there is unavailability of data of cold worked ASS in the standard steel book as the industries have not incorporated cold worked ASS in their applications. Sun et al (2013) investigated the effects of the cold rolling strain on high nitrogen austenitic stainless steels (HNSSs) with two high mill roll that gave 0.2 mm thickness reduction per pass. The authors concluded that HNSS exhibits a satisfactory level of ductility (12.3%-86.6%) and high strength (1001-2236 MPa) as compared to the classical stainless steels.…”

Effect of solution treatment on microstructure and properties of 00Cr32Ni7Mo3.5N

“…This result is different from HIP samples at the same solution temperature. In addition, annealing twins (pointed by white arrow in Figure 5(a)) appear in γ grains, and their number increases with increasing solution temperature [28,29]. Similarly, the σ phase can be eliminated when the solution temperature is above 1050°C.…”

Plastic flow behavior and its relationship to tensile mechanical properties of high nitrogen nickel-free austenitic stainless steel

“…[1][2][3][4][5][6][7][8][9][10][11][12] and thus are becoming an important class of engineering materials. The appropriate analysis of plastic flow behavior or stress-strain curve of HNSs is of critical importance for optimizing their microstructure and mechanical properties and extending their engineering applications.…”