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Comparison of early stages of precipitation in Mo‐rich and Mo‐poor maraging stainless steels

The precipitation process during ageing in the Mo‐poor alloy Carpenter 455 has been investigated by three‐dimensional atom probe (3DAP) and energy‐filtered transmission electron microscopy. The ageing treatment was performed at 475 °C for 5 min, 25 min, 1 h and 2 h. The precipitation of a mixed Ni‐, Ti‐ and Cu‐rich phase was observed after 25 min of ageing. A complete separation between Ni/Ti‐rich and Cu‐rich regions occurred within 1–2 h of ageing. After 2 h of ageing at 475 °C, coarsening of the η‐Ni3Ti precipitates was observed. Moreover, large Ni/Ti‐rich and Cu‐rich particles were observed in the lath boundaries after 2 h of ageing. The results were compared with the precipitation process in the Mo‐rich alloy 1RK91. Copyright © 2007 John Wiley & Sons, Ltd.