INVESTIGATION ON PHASE TRANSFORMATION OF ZG06Cr13Ni4Mo IN TEMPERING PROCESS WITH LOW HEATING RATE

Acta Metall Sin

2008, Vol. 44

Issue (6): 681-685 DOI:

Research Articles

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INVESTIGATION ON PHASE TRANSFORMATION OF ZG06Cr13Ni4Mo IN TEMPERING PROCESS WITH LOW HEATING RATE

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中国科学院金属研究所

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;. INVESTIGATION ON PHASE TRANSFORMATION OF ZG06Cr13Ni4Mo IN TEMPERING PROCESS WITH LOW HEATING RATE. Acta Metall Sin, 2008, 44(6): 681-685 .

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Abstract In order to clarify martensite to austenite phase transformation mechanism of ZG06Cr13Ni4Mo during tempering between As and Af with low heating rate of 0.05℃/s, a systematic study by dilatometer, XRD, TEM and EDX was carried out. The experimental results indicate that the reversed austenite generated during tempering is rich in Ni and does not have high density dislocation, which demonstrate the martensite to austenite phase transformation with low heating rate proceeds by diffusion. The reversed austenite generated over 600℃ will partially transform to martensite during subsequent cooling. One-stage tempering can get the maximal amount of reversed austenite at 620℃. Two-stage tempering system 620℃~660℃ ＋ 600℃ can dramatically increase the amount of reversed austenite, because the new martensite transformed from unstable reversed austenite at first-stage tempering at 620℃~660℃ provides dispersive nucleation sites for the reversed austenite in the second-stage tempering at 600℃.

Key words: ZG06Cr13Ni4Mo reversed austenite mechanism of phase transformation tempering

Received: 05 November 2007

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TG142.24

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2008/V44/I6/681

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