Effects of temperature and load during hot impression behavior of Cr-Ni stainless steel

A Sai Deepak Kumar,E Vara Prasad,Mohammad Fayaz Anwar,P Bharath Sreevatsava,Vadapally Rama Rao,Vanitha Chilamban

doi:10.30544/745

A Sai Deepak Kumar, E Vara Prasad + Show 4 more

Open Access

https://doi.org/10.30544/745

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Abstract

Austenitic Stainless steels are majorly used because of their high resistance to aqueous corrosion and high temperature properties. Some major applications of stainless steels at high temperatures include engine and exhaust components in aircrafts, recuperators in steel mills, and pulverized coal injection lances for blast furnaces. In all the above said applications, the components are constantly subjected to loads and high temperatures. This makes the study of their creep behavior very important to decide the life of the component. Cr-Ni stainless steel was used as a starting material, and hot impression creep test was performed on cylindrical samples of 10 mm height and 15 mm diameter for a dwell time of 150 min at two different loads of 84 and 98 MPa and at two different temperatures 450 and 500 °C. The time vs. indentation depth was plotted, and creep rate was calculated in each case. It was observed that with an increase in time, creep rate increased in the primary creep region and remained almost constant in the secondary creep region irrespective of temperature and load. The indentation depth and creep rate increased with an increase in load and temperature.

Highlights

Austenitic Stainless steels are mainly used for both high temperature and low temperature service conditions because of it high strength and corrosion resistance
In a conventional creep test, a uniaxial tensile and constant load is applied on a tensile specimen at a constant high temperature above homologous temperature, and strain is measured with an increase in time
The indentation depth increased with an increase in temperature from 450 °C to 500 °C at a constant load of 84 MPa as shown in Fig. 2(a), 2(b)

Summary

Introduction

Austenitic Stainless steels are mainly used for both high temperature and low temperature service conditions because of it high strength and corrosion resistance. In a conventional creep test, a uniaxial tensile and constant load is applied on a tensile specimen at a constant high temperature above homologous temperature, and strain is measured with an increase in time. Hot impression creep test a constant compressive load applied with the help of a flat cylindrical indenter [1,2,3,4,5,6,7,8,9,10,11]. Donyau Chiang et al investigated the impression creep behavior of 99.9% pure single crystal lead using a 100 μm diameter punch at ambient and elevated temperatures.

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