Showing papers on "Microalloyed steel published in 1985"

Influence of silver on structure and properties of low-carbon steel

Abstract: Silver has only slight solubility in low–carbon steel at elevated temperatures (~ 0·08 wt-% at the solidus) and precipitates on cooling as fine particles (< 10 nm) in the interphase mode. When present in as-cast steel at an estimated volume fraction of ~ 0·0006, silver can cause precipitation strengthening of up to 50 MN m−2. In as–rolled and in normalized steels, silver (0·02 wt-%) improves both strength and toughness mainly through grain refinement, with only a small influence from precipitation hardening. An important observation is the improvement to the heat affected zone toughness of high heat input welds which can result from small silver additions (0·02 wt-%) to C–Mn–AI–V steels. However, because of its relatively high cost, it remains to be demonstrated whether silver will impart sufficient benefit to steel properties to be commercially acceptable as an alloying addition.MST/44

Sintering of Titanium Alloyed Steels

Abstract: An investigation into the manufacture of sintered steels containing titanium as an alloying element is reported. Transient liquid phase sintering has been used. Titanium may be used to generate three types of alloy system: (i) microalloyed, (ii) solid solution strengthened, and (iii) precipitation hardened. Structural alterations and shrinkage during sintering, as well as mechanical properties developed following heat treatment, are presented and discussed. Ultimate tensile strength and elongation to failure were found to be ∼500 MN m−2 and 5%, 400–450MN m −2 and 25–20%, and 600–700 MN m−2 and 3–2% for alloys of types (i), (ii), and (iii), respectively. PM/0316