Microstructure evolution and precipitation behavior of 0Cr16Ni5Mo martensitic stainless steel during tempering process

The microstructure evolution and precipitation behavior of a low carbon high nitrogen martensitic stainless steel containing 15%Cr-5%Ni-1%Mo-0.16%N (in mass percentage) after tempering at temperatures ranged from 300 °C~700 °C were investigated by hardness test, X-ray diffraction (XRD) and Transmission electron microscopy (TEM). The steel exhibits second hardening behavior after tempering at temperatures below 500 °C. Tempering at temperatures above 500 °C promotes the formation of reversed austenite and the precipitation of Cr2N. The coherent orientation relationship of Cr2N with martensite was revealed as , . Retained austenite originated from reversed austenite at room temperature results in the softening of the steel, and the retransformation of reversed austenite to untempered martensite after tempering at temperatures above 600 °C restores the hardness of the steel. σ phase was also found in specimens tempered at temperatures ranged from 500 °C to 700 °C.

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Microstructure evolution during friction stir welding of 1Cr11Ni2W2MoV martensitic stainless steel at different tool rotation rates

Materials Characterization ◽

10.1016/j.matchar.2021.111561 ◽

2021 ◽

pp. 111561

Author(s):

Mohamed Ragab ◽

Hong Liu ◽

Mohamed M.Z. Ahmed ◽

Guan-Jun Yang ◽

Zheng-Ji Lou ◽

...

Keyword(s):

Stainless Steel ◽

Friction Stir Welding ◽

Microstructure Evolution ◽

Martensitic Stainless Steel ◽

Friction Stir ◽

Rotation Rates ◽

Tool Rotation

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Effect of Different Parameters of Quenching and Tempering Process on SS410 Grade Martensitic Stainless Steel

International Journal for Research in Applied Science and Engineering Technology ◽

10.22214/ijraset.2021.36934 ◽

2021 ◽

Vol 9 (VII) ◽

pp. 2712-2721

Author(s):

Priya Narsale

Keyword(s):

Stainless Steel ◽

Martensitic Stainless Steel ◽

Air Cooling ◽

Austenitizing Temperature ◽

Quenching Rate ◽

Tempering Temperature ◽

Temperature Ranges ◽

General Material ◽

Quenching And Tempering ◽

Tempering Process

This paper reports the influence of different chemical composition, austenitizing temperature, quenching rate and tempering temperature on the mechanical properties and microstructure of martensitic stainless-steel SS 410 grade. For calculating general material properties such as hardness and yield strength of SS 410 grade, JMatpro software is used. Analysis of SS 410 grade has been done for austenitizing temperature ranging from 9250C to 10100C followed by tempering whose temperature ranges from 2050C to 6050C.The proper practices of quenching and tempering should be performed ensuring the suitable microstructure of the steels. To get fully Martensite, quenching has to be done at least at 0.40C/s or more than that. The results also shows that composition of carbon has great effect on transition temperature Ms and Mf of martensitic stainless steel 410 grade as compared to chromium. Air cooling or oil quenching this type steels from austenite phase results in microstructure consists of mainly hard and brittle martensite, small amount of retained austenite. Subsequent tempering process reduces hardness and increases ductility and toughness.

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