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Strengthening mechanisms in Mn bearing and similar extra low carbon high strength low alloy “mar” steels
Author(s) -
Patwardhan Arun Kumar
Publication year - 1983
Publication title -
archiv für das eisenhüttenwesen
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0003-8962
DOI - 10.1002/srin.198305266
Subject(s) - lath , materials science , alloy , austenite , ternary operation , carbon fibers , precipitation hardening , hardening (computing) , solid solution strengthening , metallurgy , toughness , grain size , strengthening mechanisms of materials , high carbon , composite material , martensite , microstructure , layer (electronics) , composite number , computer science , programming language
Discussion on the strengthening mechanisms in Mn bearing and similar extra low‐carbon HSLA “mar” steels based on 1. the factors affecting strength of martensites and 2. the parameters related with its fine structure namely packet/block size and lath width. Inferences concerning a) dislocation density as the main source of strengthening with minor contribution from grain‐size, b) difficulty in isolating the sub‐structural contribution from solid solution hardening because of complex interactions in ternary and multi‐component systems, c) packet/block‐size and lath‐width as not being independent variables, their benificial effect only through the parameters controlling them, d) retained austenite at favourable locations proving benificial to the overall toughness and, e) the effect of possible formation of M 23 C 6 and retention of some austenite, during thermal and/or mechanical treatments on properties. The proposed model in general valid except for some Fe‐Mn‐Si compositions. Additional strengthening in them attributed to a stronger Mn‐Si interaction.