Tuesday, January 18, 2022

Prof. PR Rao Memorial Lecture at NML held, focus on steel making

Jamshedpur : NPGMM Trust Dept. of Metallurgical Engineering, Indian Institute of Technology (BHU), Varanasi and The National Academy of Sciences, India, Jharkhand Chapter, Office – CSIR-NML, Jamshedpur organized the 4th Prof. P. Ramachandra Rao, Memorial Lecture today at CSIR-NML, Auditorium.

Engineering students from Aditya Institute of Technology, Adityapur; AcSIR students; CSIR-NML Research Fellows; Scientist; Engineers from Tata Steel and invited dignitaries attended the Lecture. Prof. S.N. Ojha, Dept. of Metallurgical Engineering, IIT, BHU, Varanasi Chaired the function. Dr. R.K. Mandal, Head Metallurgical Department of IIT, BHU introduced the speaker. Dr. G. Malakondaiah, Formerly Director, Defence Metallurgical Laboratory, DRDO, Hyderabad & Chief Controller, R&D (HR&M), DRDO, New Delhi delivered the talk on Sustained Steel Research : A Case Study of DMR-1700 Steel.

Dr. S. Srikanth, Director, CSIR-NML, Jamshedpur welcomed the gatherings. Dr. Srikanth introduced (Late) Prof. P. Ramachandra Rao, former Director, CSIR-NML, and about his contributions in field of Metallurgy and Materials Science. Dr. Arvind Sinha, Sr. Principal Scientist, CSIR-NML, coordinated the function.

Several thousand grades of steel are available in tonnage production… said Dr. G. Malakondaiah, like – Plain carbon steels; Alloy steels (Low alloy steels & Highly alloyed steels); Stainless steels (Ferritic, Austenitic and Martensitic); Dual phase steels; IF steels and many more… Similarly, There is a steel for practically any applications like – Automotive steels; Structural steels (Construction, Machinery and Large structures); Pipeline steels; Steels for aerospace and Naval steels etc. Steels for several advanced structural applications, such as aircraft and aerospace, need to possess Ultrahigh Strength (YS > 1400 MPa) coupled with high fracture toughness to meet the requirement of minimum weight while ensuring high reliability.

According to Dr. G. Malakondaiah, need for basic studies are – (i) Deformation behaviour of iron and its alloys is well understood; (ii) Studies on fracture behaviour are limited and fracture resistance was measured either in terms of impact energy or ductile-brittle transition temperature; and (iii) There is, in general, no one-to-one correlation between impact energy and fracture toughness. This emphasises the need to undertake valid fracture toughness measurements to understand and to quantify the toughening behavior.

DMR-1700 steel in the softened condition can be easily formed/rough machined before finally subjecting it to hardening and tempering treatment in order to develop an optimum combination of strength and fracture toughness.

Cost Benefit – (1) DMR-1700 steel with ~7% total alloy content is considerably cheaper (one-third) than highly alloyed (32%) 250-grade maraging steel, and (2) A one-to-one substitute for 250-grade maraging steel for booster motor casings.

MIDHANI, in association with DMRL, optimized annealing and wire drawing parameters for manufacture of filler wire to ensure dissolved oxygen content to the specified upper limit of 50 ppm.

DMR-1700 STEEL can be used for armour applications: Motor Casings, Flow forming Thin Seamless Tubes and steel plates through continuous casting routes.

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