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Posted: June 18th, 2024
Quenching and Partitioning on Grade 91 Stainless Steel
1.1 Project Background
Steel is one of the primary materials in today’s world, as a result, more than 2700 variety of steels have been made. To make the better living standard, it is necessary to find a suitable material structure for efficient functioning without unexpected failure with abundant availability at relatively low cost. Over the last many years, Advanced High Strength Steel (AHSS) has received more attention. The main difference between conventional high strength steel and AHSS is their microstructure. The conventional high strength steel are single phase ferritic steel, while all AHSS are complex and multiphase microstructure produced by controlling the chemical compositions of materials and cooling rate of heat treatment process [1]. AHSS frequently used for cost reduction, increase reliability of component, and higher mechanical performance under static and fatigue loading condition. To producing AHSS, different mechanisms are employed with the goal of achieving desired range of ductility and strength.
There are mainly three generations of an AHSS-based on a microstructure of steel. The first generation of AHSS are mainly ferrite-based steel and comprises of (1) dual-phase (2) complex-phase (3) Transformation Induced Plasticity (TRIP) steel. The microstructure of the first generation AHSS is listed in Table 1.1. Initially, at the starting of the 1st generation of steel, it’s assumed that it contains only two-phase microstructure ferrite and martensite produced by quenching of steel at the intercritical annealing temperature [2]. However, research in the 1970’s showed that the first generation of AHSS steels contained complex combination of other microstructure like austenite and bainite. The complex phase contains pearlite within the ferrite
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This thesis follows format used by IEEE journal on Components, Packaging and Manufacturing Technology and bainite matrix. The first generation of AHSS shows a combination of high strength and low ductility [2].
Table 1.1 Microstructure of the first generation of AHSS [2].
| First generation AHSS | Microstructure |
| Dual phase | Ferrite + Martensite |
| Complex phase | Ferrite + bainite + pearlite |
| Transformation Induced plasticity (TRIP) | Ferrite + martensite/ |
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