Journal of Metallurgy / 2012 / Article / Tab 2

Research Article

The Effect of Microstructure on Stress-Strain Behaviour and Susceptibility to Cracking of Pipeline Steels

Table 2

Effect of heat treatment on pearlite bands in the “LT” face of grade X65 steel.

Temperature (°C)Soak timeMode of coolingMicrostructureGrain size (μm)No. of treatments

95060 hFC Banded with average spacing* (AS) 201 μm241
11751 hFC Slight traces of banding with large pearlite areas and some Widmanstätten291
1175 then 10001 h then 20 minFC Banded with AS 60 μm122
11755 hFC Not banded with ferrite/pearlite and some Widmanstätten501
1175 then 9505 h then 20 minFC then AC Not banded (ferrite/pearlite)92
1175 then 950 then 1000 5 h then 20 min then 20 minFC then AC then FCBanded with AS 130 μm103
1200 then 1000 20 min then 20 minFCBanded with AS 52 μm132

*As-received average pearlite band spacing and average grain size: 19 and 6 μm, respectively.

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