Table 2.

Mean coefficient of thermal expansion α _CTE for SLM-fabricated Invar, Invar 36^®[2], and stress-relieved SLM-fabricated Invar

Temp (°C)	30–100	30–150	30−200	30–260	30–279
SLM z	−0.355	0.164	0.889	2.77	3.56
SLM x–y	−0.471	0.098	0.767	2.58	3.34
Invar 36®	1.6a	2.0	–	4.1	–
SLM stress-relieved z	1.00	1.34	1.85	2.96	3.68
SLM stress-relieved x–y	0.70	0.99	1.53	2.74	3.36

^aFor temperature range 25–93 °C

Units are (10⁻⁶/ °C); uncertainty of measurement is ±0.01 10⁻⁶/ °C